US20060275034A9 - Fully protected broadcast and select all optical network - Google Patents
Fully protected broadcast and select all optical network Download PDFInfo
- Publication number
- US20060275034A9 US20060275034A9 US10/338,088 US33808803A US2006275034A9 US 20060275034 A9 US20060275034 A9 US 20060275034A9 US 33808803 A US33808803 A US 33808803A US 2006275034 A9 US2006275034 A9 US 2006275034A9
- Authority
- US
- United States
- Prior art keywords
- clockwise
- coupled
- fiber
- wdm
- network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0297—Optical equipment protection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/506—Multiwavelength transmitters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/564—Power control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0283—WDM ring architectures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0293—Optical channel protection
- H04J14/0294—Dedicated protection at the optical channel (1+1)
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0293—Optical channel protection
- H04J14/0295—Shared protection at the optical channel (1:1, n:m)
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/437—Ring fault isolation or reconfiguration
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
Definitions
- Broadcast-and-select technique has been used in linear, star, and ring optical networks.
- multiple wavelengths in a fiber are simultaneously broadcast to multiple destinations via one or more optical couplers.
- At each destination there is either a tunable filter or a fixed filter/demultiplexer to perform the “select” function.
- optical ring networks usually require protection on one or all of the following facilities: (i) optical fibers on the ring; (ii) WDM equipment; and (iii) client equipment, including but not limited to SONET/SDH, Gigabit Ethernet, Fiber Channel and the like. There is no method to achieve any of these protections in a broadcast and select optical network.
- an object of the present invention is to provide a broadcast and select architecture in an all optical fiber ring network.
- Another object of the present invention is to provide a broadcast and select optical ring network with fiber protection, and/or WDM equipment, protection, and/or client equipment protection.
- Yet another object of the present invention is to provide an all optical fiber ring network, which uses inline optical amplifiers, that has minimal fiber ring lasing or coherent cross-talk on the ring.
- a further object of the present invention is to provide an all optical fiber ring network that eliminates in-line amplifier gain saturation on the ring, by equalizing the power levels of all wavelengths on the ring at the input of each in-line amplifier.
- an all optical network for optical signal traffic that provides at least a first ring with at least a first clockwise fiber, a second counter-clockwise fiber and a plurality of network nodes.
- Each node has at least a WDM transponder that with a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction.
- the line-side receiver includes a fixed or a tunable optical wavelength filter.
- At least a first add and a first drop broadband couplers are positioned on each fiber. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic. The first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber.
- the first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber.
- a first coupler pair includes first and second couplers in each network node.
- the first coupler has first and second output ports and a first input port coupled to a line-side transmitter.
- the first output port is coupled to the clockwise fiber and the second output port is coupled to the counter-clockwise fiber.
- the first coupler enables the line-side transmitter to launch signals to both the clockwise and counter-clockwise fibers.
- the second coupler has first and second input ports and a first output port coupled to a line-side receiver.
- the first input port is coupled to the clockwise fiber and the second input port coupled to the counter-clockwise fiber.
- the second coupler enables the line-side receiver to receive signals from both the clockwise and counter-clockwise fibers.
- an all optical network for optical signal traffic has a first ring with at least a clockwise and a counter-clockwise fiber and a plurality of network nodes.
- Each node has at least a WDM transponder that includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction.
- the line-side receiver includes a fixed or a tunable optical wavelength filter.
- At least a first add and a first drop broadband couplers are positioned on the first ring. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic. The first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber.
- a first switch pair includes first and second switches.
- the first switch has first and second output ports and a first input port coupled to the line-side transmitter.
- the first output port is coupled to the clockwise fiber and the second output port is coupled to the counter-clockwise fiber.
- the first switch enables the line-side transmitter to launch signals to either the clockwise or counter-clockwise fibers.
- the second switch has first and second input ports and a first output port coupled to the line-side receiver.
- the first input port is coupled to the clockwise fiber and the second input port is coupled to the counter-clockwise fiber.
- the second switch enables the line-side receiver to receive signals from either the clockwise or counter-clockwise fiber.
- an all optical network for optical signal traffic has a first ring with at least a clockwise and a counter-clockwise fibers and a plurality of network nodes. At least a first add and a first drop broadband couplers are positioned on each fiber. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic. The first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber. First and second coupler pairs are provided and each include first and second couplers. A working WDM transponder is coupled to the first ring.
- the working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction.
- the client side transmitter and the client side receiver of the working WDM transponder are coupled to a receiver and a transmitter of the working client side equipment respectively.
- a protection WDM transponder is coupled to the first ring.
- the working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction.
- the client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively.
- the client side transmitter and the client side receiver of the working WDM transponder are coupled to a receiver and a transmitter of the working client side equipment respectively.
- a protection WDM transponder is coupled to the first ring.
- the working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction.
- the client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively.
- At least a first add and a first drop broadband couplers are positioned on each fiber. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic.
- the first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber.
- First and second coupler pairs are provided and each include first and second couplers.
- the first coupler pair is coupled to the working WDM transponder and the second coupler pair is coupled to the protection WDM transponder.
- the first coupler has first and second output ports and a first input port coupled to the WDM transponder line-side transmitter.
- the first output port is coupled to the clockwise fiber and the second output port is coupled to the counter-clockwise fiber.
- the first coupler enables the WDM transponder line-side transmitter to launch signals to both the clockwise and counter-clockwise fibers.
- the second coupler has first and second input ports and a first output port coupled to the WDM transponder line-side receiver.
- the first input port is coupled to the clockwise fiber and the second input port is coupled to the counter-clockwise fiber.
- the second coupler enables the WDM transponder line-side receiver to receive signals from both the
- an all optical network for optical signal traffic includes a first ring with at least a first clockwise and a second counter-clockwise fibers and a plurality of network nodes. At least a first add and a first drop broadband couplers are positioned on each fiber. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic. The first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber.
- a working WDM transponder is coupled to the first ring.
- the working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction.
- the client side transmitter and the client side receiver of the working WDM transponder are connected back to back to a receiver and a transmitter of working client equipment respectively.
- a protection WDM transponder is coupled to the first ring.
- the protection WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction.
- the client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively.
- First and second coupler pairs are provided, each with first and second couplers. The first coupler pair is coupled to the working WDM transponder and the second coupler pair is coupled to the protection WDM transponder.
- the first coupler has first and second output ports and a first input port coupled to the WDM transponder line-side transmitter.
- the first output port is coupled to the clockwise fiber and the second output port is coupled to the counter-clockwise fiber.
- the first coupler enables the WDM transponder line-side transmitter to launch signals to both the clockwise and counter-clockwise fibers.
- the second coupler has first and second input ports and a first output port coupled to the WDM transponder line-side receiver.
- the first input port is coupled to the clockwise fiber and the second input port is coupled to the counter-clockwise fiber.
- the second coupler enables the WDM transponder line-side receiver to receive signals from both the clockwise and counter-clockwise fibers.
- a 1 ⁇ 2 coupler is configured to launch client optical signals to the WDM working transponder and the WDM protection transponder.
- a 1 ⁇ 2 coupler is configured to permit client equipment to receive signals from either the working WDM transponder or the protection WDM transponder.
- a client-side transmitter on the WDM equipment is turned off to reduce coherent crosstalk and interference.
- an all optical network for optical signal traffic has a first ring with at least a first clockwise and a second counter-clockwise fibers and a plurality of network nodes. At least a first add and a first drop broadband couplers are coupled to each fiber. Each coupler has first and second ports for through traffic and a third port for adding traffic to or from each ring fiber. The first add and first drop broadband couplers are positioned on the first ring and configured to minimize a pass-through loss in the first ring.
- a working WDM transponder is coupled to the first ring.
- an all optical network for optical signal traffic has a first ring with at least a first clockwise and a second counter-clockwise fibers and a plurality of network nodes. At least a first add and a first drop broadband couplers are coupled to each fiber. Each coupler has first and second ports for through traffic and a third port for adding traffic to or from each ring fiber. The first add and first drop broadband couplers are positioned on each fiber, and configured to minimize a pass-through loss in each fiber.
- a working WDM transponder is coupled to the first ring.
- the working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction.
- the client side transmitter and the client side receiver of the working WDM transponder are connected back to back to a receiver and a transmitter of working client equipment respectively.
- a protection WDM transponder is coupled to the first ring.
- the protection WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction.
- the client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively.
- First and second switch pairs are provided, each with first and second switches. The first switch pair is coupled to the working WDM transponder and the second switch pair is coupled to the protection WDM transponder.
- the first switch has first and second output ports and a first input port coupled to the WDM transponder line-side transmitter.
- the first output port is coupled to the clockwise fiber and the second output port is coupled to the counter-clockwise fiber.
- the first switch enables the WDM transponder line-side transmitter to launch signals to either the clockwise or counter-clockwise fibers.
- the second switch has first and second input ports and a first output port coupled to the WDM transponder line-side receiver.
- the first input port is coupled to the clockwise fiber and the second input port is coupled to the counter-clockwise fiber.
- the second switch enables the WDM transponder line-side receiver to receive signals from either the clockwise or counter-clockwise fibers.
- the client side transmitter and the client side receiver of the working WDM transponder are connected back to back to a receiver and a transmitter of working client equipment respectively.
- a protection WDM transponder is coupled to the first ring.
- the protection WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction.
- the client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively.
- First and second switch pairs are provided, each including first and second switches.
- a 1 ⁇ 2 coupler is configured to launch client optical signals to the WDM working transponder and the WDM protection transponder.
- a 1 ⁇ 2 coupler is configured to permit client equipment to receive signals from either the working WDM transponder or the protection WDM transponder.
- a client-side transmitter on the WDM equipment is turned off to reduce coherent crosstalk and interference.
- the client side transmitter and the client side receiver of the working WDM transponder are connected back to back to a receiver and a transmitter of working client equipment respectively.
- a protection WDM transponder is coupled to the first ring.
- the protection WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction.
- the client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively.
- First and second switch pairs are provided, each including first and second switches. The first switch pair is coupled to the working WDM transponder and the second switch pair is coupled to the protection WDM transponder.
- a 1 ⁇ 2 coupler is configured to launch client optical signals to the WDM working transponder and the WDM protection transponder.
- a 1 ⁇ 2 coupler is configured to permit client equipment to receive signals from either the working WDM transponder or the protection WDM transponder.
- a client-side transmitter on the WDM equipment is turned off to reduce coherent crosstalk and interference.
- FIG. 1 ( a ) illustrates one embodiment of an all optical network of the present invention that uses couplers in each node to protect fibers in a ring.
- FIG. 1 ( b ) illustrates recovery of the FIG. 1 ( a ) all optical network after a fiber breaks.
- FIG. 2 ( a ) illustrates one embodiment of an all optical network of the present invention that uses 1 ⁇ 2 switches in each node to protect fibers in a ring.
- FIG. 2 ( b ) illustrates recovery of the FIG. 2 ( a ) all optical network after a fiber breaks.
- FIG. 3 ( b ) illustrates recovery of the FIG. 3 ( a ) all optical network after both a fiber break and WDM equipment failure.
- FIG. 4 ( a ) illustrates one embodiment of an all optical network of the present invention that uses couplers in each node to protect WDM equipment and fibers in a ring.
- FIG. 4 ( c ) illustrates recovery of the FIG. 4 ( a ) all optical network after both a fiber break and WDM equipment failure.
- FIG. 5 ( b ) illustrates recovery of the FIG. 5 ( a ) all optical network of SONET equipment when WDM equipment fails.
- FIG. 5 ( c ) illustrates recovery of the FIG. 5 ( a ) all optical network after a fiber break.
- FIG. 6 ( a ) illustrates one embodiment of an all optical network of the present invention that uses switches in each node to protect WDM equipment and fibers in a ring.
- FIG. 6 ( b ) illustrates recovery of the FIG. 6 ( a ) all optical network when WDM equipment fails.
- FIG. 6 ( c ) illustrates recovery of the FIG. 6 ( a ) all optical network when there is both a fiber break and a failure of WDM equipment.
- FIG. 7 ( a ) illustrates another embodiment of a broadcast and select metro-optical network architecture with a Hub that contains WDM Muxes, demuxes, transceivers or OEO regenerators and the like.
- FIG. 8 ( a ) illustrates one embodiment of an all-passive optical ring network with broadband/band optical couplers on a ring as add-drop units, and narrowband OAD off the ring.
- FIG. 8 ( b ) illustrates another embodiment of the FIG. 8 ( a ) network with linecards added in series.
- FIG. 8 ( c ) illustrates another embodiment of the FIG. 8 ( a ) network with linecards added in parallel.
- FIG. 9 ( a ) is similar to the FIG. 2 ( a ) embodiment except that four WDM transponders per node are provided, and protections switches are triggered by the bit-error-rate of each transponder.
- FIG. 9 ( b ) is similar to the FIG. 9 ( b ) embodiment except that protection switches are triggered by the locally received optical power from the ring.
- an all optical network 10 for optical signal traffic provides at least a first ring 12 with at least a first clockwise fiber 14 , a second counter-clockwise fiber 16 and a plurality of network nodes 18 .
- Each node 18 has at least a WDM transponder 20 with a line-side transmitter 22 and a client-side receiver 24 in a first direction, and a line-side receiver 26 and a client-side transmitter 28 in an opposing second direction.
- Line-side receiver 26 can include a fixed or a tunable optical wavelength filter 30 .
- At least first add and a first drop broadband couplers 32 and 34 are positioned on each fiber 14 or 16 . Each coupler 32 and 34 has three ports for through traffic and for adding or dropping local traffic. First add and first drop broadband couplers 32 and 34 minimize a pass-through loss in fibers 12 or 14 , and to ensure that he power levels of locally added wavelengths can be equalized to those of through-wavelengths.
- a first coupler pair includes first and second couplers 36 and 38 in each network node 18 .
- First coupler 36 has first and second output ports 40 and 42 respectively, and a first input port 44 coupled to a line-side transmitter 22 .
- First output port 40 is coupled to clockwise fiber 14 and second output port 42 is coupled to counter-clockwise fiber 16 .
- First coupler enables the line-side transmitter to launch signals to both clockwise and counter-clockwise fibers 14 and 16 .
- Second coupler 38 has first and second input ports 46 and 48 and a first output port 50 coupled to a line-side receiver 26 .
- First input port 48 is coupled to clockwise fiber 14 and second input port 46 is coupled to counter-clockwise fiber 16 .
- Second coupler 38 enables the line-side receiver to receive signals from both clockwise and counter-clockwise fibers 14 and 16 . Note that in each node, the transmitted wavelengths are always different from the selectively received wavelengths.
- Line-side receiver 124 includes a fixed or a tunable optical wavelength filter 128 .
- At least a first add and a first drop broadband couplers 130 and 132 are positioned on each fiber 112 or 114 .
- Each coupler has three ports for through traffic and for adding or dropping local traffic.
- First add and first drop broadband couplers 130 and 132 are configured to minimize a pass-through loss in first ring 110 , and to ensure that he power levels of locally added wavelengths can be equalized to those of through-wavelengths.
- a first switch pair includes first and second switches 140 and 142 .
- First switch 140 has first and second output ports 144 and 146 and a first input port 148 coupled to line-side transmitter 120 .
- First output port 144 is coupled to clockwise fiber 112 and second output port 146 is coupled to counter-clockwise fiber 114 .
- First switch 140 enables line-side transmitter 120 to launch signals to either clockwise 112 or counter-clockwise fiber 114 .
- Second switch 142 has first and second input ports 150 and 152 and a first output port coupled 154 to line-side receiver 124 .
- First input port 150 is coupled to clockwise fiber 112 and second input port 152 is coupled to counter-clockwise fiber 114 .
- Second switch 142 enables line-side receiver 124 to receive signals from either clockwise or counter-clockwise fibers 112 and 114 .
- an optical switch coupled to fiber 112 and an optical switch coupled to fiber 114 are now open. These optical switches can be 1 ⁇ 1 or 1 ⁇ 2 switches.
- a working WDM transponder 228 is coupled to first ring 210 .
- Working WDM transponder 228 includes a line-side transmitter 230 and a client-side receiver 232 in a first direction, and a line-side receiver 234 and a client-side transmitter 236 in an opposing second direction.
- Client side transmitter 236 and client side receiver 232 of working WDM transponder 228 are coupled to a receiver 238 and a transmitter 240 of the working client side equipment respectively.
- a protection WDM transponder 242 is coupled to first ring 210 .
- Protection WDM transponder 242 includes a line-side transmitter 244 and a client-side receiver 246 in a first direction, and a line-side receiver 248 and a client-side transmitter 250 in an opposing second direction.
- Client side transmitter 250 and the client side receiver 246 of protection WDM transponder 242 are coupled to a receiver 252 and a transmitter 254 of the protection client side equipment respectively.
- Each coupler pair includes a first add and a first drop broadband couplers 218 and 220 are positioned on each fiber.
- Each coupler 218 and 220 has three ports for through traffic and for adding or dropping local traffic.
- First add and first drop broadband couplers 218 and 220 are configured to minimize a pass-through loss in either 212 or 214 , and to ensure that he power levels of locally added wavelengths can be equalized to those of through-wavelengths.
- First coupler pair 211 and 213 is coupled to working WDM transponder 228 and second coupler pair 215 and 217 is coupled to protection WDM transponder 242 .
- First coupler 213 of the first pair has first and second output ports 274 and 276 and a first input port 278 coupled to WDM transponder line-side transmitter 230 .
- First output port 274 is coupled to clockwise fiber 212 and second output port 276 is coupled to counter-clockwise fiber 414 .
- FIG. 3 ( b ) illustrates recovery of all optical network 200 after both a break of fiber 212 (or 214 ) and WDM equipment failure.
- the two switches in the hub are flipped from open to close position. Now in each node, owing to the fact that signals are received and transmitted in both directions, the fiber break is completely bypassed.
- an all optical network 300 for optical signal traffic includes a first ring 310 with at least a first clockwise 312 and a second counter-clockwise fibers 314 and a plurality of network nodes 316 . At most two pairs of add and drop broadband couplers 318 and 320 are positioned on each fiber 312 or 314 . Each coupler 318 and 320 has first and second ports 322 and 324 for through traffic and a third port 326 for adding or dropping local traffic. First add and first drop broadband couplers 318 and 320 are configured to minimize a pass-through loss in first ring 310 , and to ensure that he power levels of locally added wavelengths can be equalized to those of through-wavelengths.
- a working WDM transponder 328 is coupled to first ring 310 .
- Working WDM transponder 328 includes a line-side transmitter 330 and a client-side receiver 332 in a first direction, and a line-side receiver 334 and a client-side transmitter 336 in an opposing second direction.
- Client side transmitter 336 and client side receiver 332 of working WDM transponder 328 are connected back to back to a receiver 338 and a transmitter 340 of client equipment respectively.
- a protection WDM transponder 342 is coupled to first ring 310 .
- Protection WDM transponder 342 includes a line-side transmitter 344 and a client-side receiver 346 in a first direction, and a line-side receiver 348 and a client-side transmitter 350 in an opposing second direction.
- Client side transmitter 350 and client side receiver 346 of protection WDM transponder 342 are coupled to the receiver 338 and a transmitter 340 of client side equipment respectively.
- First and second coupler pairs 356 and 358 are provided, each with first and second couplers 360 and 362 .
- First coupler pair 356 is coupled to working WDM transponder 328 and second coupler pair 358 is coupled to protection WDM transponder 342 .
- First coupler 360 has first and second output ports 364 and 366 and a first input port coupled 368 to WDM transponder line-side transmitter 330 (or 344 ).
- First output port 364 is coupled to clockwise fiber 312 and second output port 366 is coupled to counter-clockwise fiber 314 .
- First coupler 360 enables WDM transponder line-side transmitter 330 (or 344 ) to launch signals to both clockwise and counter-clockwise fibers 312 and 314 .
- Second coupler 362 has first and second input ports 370 and 372 and a first output port 374 coupled to WDM transponder line-side receiver 334 (or 348 ).
- First input port 364 is coupled to clockwise fiber 312 and second input port 366 is coupled to counter-clockwise fiber 314 .
- Second coupler 362 enables WDM transponder line-side receiver 334 (or 348 ) receive signals from both clockwise and counter-clockwise fibers 312 and 314 .
- Exactly the same arrangement is also installed for the working and protection WDM transponders, as shown in FIG. 4 ( a ).
- a 1 ⁇ 2 coupler 376 is configured to launch client optical signals to WDM working transponder 328 and WDM protection transponder 342 .
- a 1 ⁇ 2 coupler 378 is configured to permit client equipment to receive signals from either working WDM transponder 328 or protection WDM transponder 342 because a client-side transmitter on WDM equipment is turned off to reduce coherent crosstalk and interference.
- FIG. 4 ( b ) illustrates recovery of all optical network 300 after a break of fiber 312 or 314 .
- FIG. 4 ( c ) illustrates recovery of all optical network 300 after both a fiber break 312 or 314 and WDM equipment failure. Again, the two switches in the hub are closed under those conditions. Now in each node, owing to the fact that signals are received and transmitted in both directions, the fiber break is completely bypassed.
- an all optical network 400 for optical signal traffic has a first ring 410 with at least a first clockwise 412 and a second counter-clockwise fibers 414 and a plurality of network nodes 416 . At most two pairs of broadband couplers 418 and 420 are coupled to each fiber 412 or 414 . Each coupler 418 and 420 has first and second ports 422 and 424 for through traffic and a third port 426 for adding traffic to or from first ring 410 .
- a working WDM transponder 434 is coupled to first ring 410 .
- Working WDM transponder 434 includes a line-side transmitter 436 and a client-side receiver 438 in a first direction, and a line-side receiver 440 and a client-side transmitter 442 in an opposing second direction.
- Client side transmitter 442 and client side receiver 438 of working WDM transponder 434 are connected back to back to a receiver 444 and a transmitter 446 of working client equipment respectively.
- An exactly the same arrangement is installed for protection WDM and client equipment, as shown in FIG. 5 ( a ).
- First and second switch pairs 464 and 466 are provided, each with first and second switches 470 and 472 .
- First switch pair 464 is coupled to working WDM transponder 434 and second switch pair 466 is coupled to protection WDM transponder 448 .
- First switch 470 has first and second output-ports 474 and 476 and a first input port 478 coupled to WDM transponder line-side transmitter 436 .
- First output port 474 is coupled to clockwise fiber 412 and second output port 476 is coupled to counter-clockwise fiber 414 .
- First switch 470 enables WDM transponder line-side transmitter 436 to launch signals to either clockwise or counter-clockwise fibers 412 and 414 .
- Second switch 472 has first and second input ports 480 and 482 and a first output port 484 coupled to WDM transponder line-side receiver 440 .
- First input port 480 is coupled to clockwise fiber 414 and second input port 482 is coupled to counter-clockwise fiber 412 .
- Second switch 472 enables WDM transponder line-side receiver 440 to receive signals from either clockwise or counter-clockwise fibers 412 and 414 .
- FIG. 5 ( b ) illustrates recovery of all optical network 400 of SONET equipment when WDM equipment fails. No switches are activated in this case.
- FIG. 5 ( c ) illustrates recovery of all optical network 400 after a break of fiber 412 or 414 . In this case, the switches in the hub are closed, and the switches in each node are switched to a different port to receive/transmit signals from/to a different direction.
- a working WDM transponder 528 is coupled to first ring 510 .
- Working WDM transponder 528 includes a line-side transmitter 530 and a client-side receiver 532 in a first direction, and a line-side receiver 534 and a client-side transmitter 536 in an opposing second direction.
- Client side transmitter 536 and client side receiver 532 of working WDM transponder 528 are connected back to back to a receiver 538 and a transmitter 540 of client equipment.
- the same arrangement is installed at the protection WDM transponder 542 , as shown in FIG. 6 ( a ).
- First and second switch pairs 556 and 558 are provided, each including first and second switches 560 and 562 .
- a 1 ⁇ 2 coupler 564 is configured to launch client optical signals to WDM working transponder 528 and WDM protection transponder 542 .
- a 1 ⁇ 2 coupler 568 is configured to permit client equipment to receive signals from either working WDM transponder 528 or protection WDM transponder 542 , because a client-side transmitter on WDM equipment is turned off to reduce coherent crosstalk and interference.
- First switch pair 556 is coupled to working WDM transponder 528 and second switch pair 558 is coupled to protection WDM transponder 542 .
- First switch 560 has first and second output ports 570 and 572 and a first input port 574 coupled to WDM transponder line-side transmitter 530 .
- First output port 570 is coupled to clockwise fiber 512 and second output port 572 is coupled to counter-clockwise fiber 514 .
- First switch 560 enables WDM transponder line-side transmitter 530 to launch signals to either clockwise or counter-clockwise fibers 512 and 514 .
- Second switch 562 has first and second input ports 576 and 578 and a first output 580 port coupled to WDM transponder line-side receiver 534 .
- First input port 576 is coupled to counter-clockwise fiber 514 and second input port 578 is coupled to clockwise fiber 512 .
- Second switch 562 enables WDM transponder line-side receiver 534 to receive signals from either clockwise or counter-clockwise fibers 512 and 514 .
- FIG. 6 ( b ) illustrates recovery of all optical network 500 when WDM equipment fails and no switches are activated.
- FIG. 6 ( c ) illustrates recovery of all optical network 500 when there is both a break of a fiber 512 or 514 and a failure of WDM equipment.
- the switches in the hub are closed, and the switches in each node are switched to a different port.
- ring 610 is provided.
- a 1 ⁇ 2 switch 616 can be located at every node so that the receiver receives either fiber 612 or 614 .
- a WDM transponder senses the loss of optical power or a high bit-error-rate, and sends a control signal to trigger the local 1 ⁇ 2 optical switch 616 to switch to a different port, as shown in FIG. 7 ( b ).
- FIG. 7 ( a ) and 7 ( b ) there are no open switches, as distinguished from the embodiments of FIGS. 1 ( a )- 6 ( c ), on fibers 612 and 614 , because the central location has electronic termination which breaks ring 610 .
- FIGS. 7 ( a ) and 7 ( b ) can also be configured such that the transmitter in the central hub is connected to a 1 ⁇ 2 switch rather than a 1 ⁇ 2 coupler, and the receiver in each node is connected to a 1 ⁇ 2 coupler rather than a 1 ⁇ 2 switch.
- an all-passive broadcast and select ring network 710 is provided, with fibers 712 and 714 , that is based generally on the same principle as that in FIGS. 1 ( a )- 6 ( c ) embodiments.
- all-passive ring 710 requires that a round-trip transmission loss must be kept at a certain level so that the recirculated signal does not cause a significant coherent cross-talk penalty.
- open switches are not required, as distinguished from the embodiments of FIGS. 1 ( a )- 6 ( c ).
- multiple WDM transponders 716 in each node are combined in series by using cascaded optical add-drop filters (OAD's) 718 in both the add and drop directions.
- OAD's optical add-drop filters
- multiple WDM transponders 716 in each node are combined by multi-port broadband power combiners in parallel.
- FIGS. 9 ( a ) through 9 ( c ) also illustrate where and how all the wavelengths on ring 810 are equalized.
- Reference points D W and D E are where all wavelengths arriving from a previous node must be adjusted to a fixed level by using the variable optical attenuator (VOA). This fixed level is to ensure that the drop in-line amplifier is operating in a linear region, and that the amplifier signal-spontaneous noise is not be a limiting factor.
- Reference points A W and A E are where the power levels of all through- and the locally added wavelengths must be equalized. Locally added wavelength power level can be adjusted by a VOA or a similar device.
- the drop amplifier or both amplifiers in each node in each direction can be eliminated. If only the drop amplifier is eliminated, the only reference point needed in each direction then is at the input of the add amplifier. If both amplifiers in each node are eliminated, then the locally added wavelength power should be equalized at the next node where there is an inline amplifier.
Abstract
Description
- This application claims the benefit of U.S. Ser. Nos. 60/229,784 filed Jun. 20/2001, 60/301,564 filed Jun. 28, 2001, and 60/309,220 filed Jul. 31, 2001 and is also a continuation-in-part of U.S. Ser. No. 09/990,196 filed Nov. 21, 2001, and of 09/575,811 filed May 22, 2000, all of which applications are fully incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates generally to all optical networks, and more particularly to an all optical network that uses broadcast and select ring architecture with various configurations to protect ring fibers, WDM equipment and client equipment.
- 2. Description of the Related Art
- Broadcast-and-select technique has been used in linear, star, and ring optical networks. In a broadcast-and-select optical network, multiple wavelengths in a fiber are simultaneously broadcast to multiple destinations via one or more optical couplers. At each destination, there is either a tunable filter or a fixed filter/demultiplexer to perform the “select” function.
- However, optical ring networks usually require protection on one or all of the following facilities: (i) optical fibers on the ring; (ii) WDM equipment; and (iii) client equipment, including but not limited to SONET/SDH, Gigabit Ethernet, Fiber Channel and the like. There is no method to achieve any of these protections in a broadcast and select optical network.
- There is a need for a fully-protected broadcast and select architecture in an all optical fiber ring network. There is a further need for a passive fiber ring network that does not have active elements. When there are in-line optical amplifiers on a ring network, there is a further need for an all optical fiber ring network that has minimal fiber ring lasing or coherent cross-talk on the ring. There is still a further need for an all optical fiber ring network that eliminates in-line amplifier gain saturation on the ring by equalizing all wavelength powers at the input of each in-line amplifier.
- Accordingly, an object of the present invention is to provide a broadcast and select architecture in an all optical fiber ring network.
- Another object of the present invention is to provide a broadcast and select optical ring network with fiber protection, and/or WDM equipment, protection, and/or client equipment protection.
- Another object of the present invention is to provide a passive fiber ring network that does not have active elements.
- Yet another object of the present invention is to provide an all optical fiber ring network, which uses inline optical amplifiers, that has minimal fiber ring lasing or coherent cross-talk on the ring.
- A further object of the present invention is to provide an all optical fiber ring network that eliminates in-line amplifier gain saturation on the ring, by equalizing the power levels of all wavelengths on the ring at the input of each in-line amplifier.
- These and other objects of the present invention are achieved in an all optical network for optical signal traffic that provides at least a first ring with at least a first clockwise fiber, a second counter-clockwise fiber and a plurality of network nodes. Each node has at least a WDM transponder that with a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The line-side receiver includes a fixed or a tunable optical wavelength filter. At least a first add and a first drop broadband couplers are positioned on each fiber. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic. The first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber.
- In another embodiment of the present invention, an all optical network for optical signal traffic provides at least a first ring with at least a first clockwise fiber, a second counter-clockwise fiber and a plurality of network nodes. Each node has at least a WDM transponder that with a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The line-side receiver includes a fixed or a tunable optical wavelength filter. At least a first add and a first drop broadband couplers are positioned on each fiber. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic. The first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber. A first coupler pair includes first and second couplers in each network node. The first coupler has first and second output ports and a first input port coupled to a line-side transmitter. The first output port is coupled to the clockwise fiber and the second output port is coupled to the counter-clockwise fiber. The first coupler enables the line-side transmitter to launch signals to both the clockwise and counter-clockwise fibers. The second coupler has first and second input ports and a first output port coupled to a line-side receiver. The first input port is coupled to the clockwise fiber and the second input port coupled to the counter-clockwise fiber. The second coupler enables the line-side receiver to receive signals from both the clockwise and counter-clockwise fibers.
- In another embodiment of the present invention, an all optical network for optical signal traffic has a first ring with at least a clockwise and a counter-clockwise fiber and a plurality of network nodes. Each node has at least a WDM transponder that includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The line-side receiver includes a fixed or a tunable optical wavelength filter. At least a first add and a first drop broadband couplers are positioned on the first ring. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic. The first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber. A first switch pair includes first and second switches. The first switch has first and second output ports and a first input port coupled to the line-side transmitter. The first output port is coupled to the clockwise fiber and the second output port is coupled to the counter-clockwise fiber. The first switch enables the line-side transmitter to launch signals to either the clockwise or counter-clockwise fibers. The second switch has first and second input ports and a first output port coupled to the line-side receiver. The first input port is coupled to the clockwise fiber and the second input port is coupled to the counter-clockwise fiber. The second switch enables the line-side receiver to receive signals from either the clockwise or counter-clockwise fiber.
- In another embodiment of the present invention, an all optical network for optical signal traffic has a first ring with at least a clockwise and a counter-clockwise fibers and a plurality of network nodes. At least a first add and a first drop broadband couplers are positioned on each fiber. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic. The first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber. First and second coupler pairs are provided and each include first and second couplers. A working WDM transponder is coupled to the first ring. The working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the working WDM transponder are coupled to a receiver and a transmitter of the working client side equipment respectively. A protection WDM transponder is coupled to the first ring. The working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively.
- In another embodiment of the present invention, an all optical network for optical signal traffic has a first ring with at least a clockwise and a counter-clockwise fibers and a plurality of network nodes. At least a first add and a first drop broadband couplers are positioned on each fiber. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic. The first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber. A working WDM transponder is coupled to the first ring. The working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the working WDM transponder are coupled to a receiver and a transmitter of the working client side equipment respectively. A protection WDM transponder is coupled to the first ring. The working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively. At least a first add and a first drop broadband couplers are positioned on each fiber. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic. The first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber. First and second coupler pairs are provided and each include first and second couplers. The first coupler pair is coupled to the working WDM transponder and the second coupler pair is coupled to the protection WDM transponder. The first coupler has first and second output ports and a first input port coupled to the WDM transponder line-side transmitter. The first output port is coupled to the clockwise fiber and the second output port is coupled to the counter-clockwise fiber. The first coupler enables the WDM transponder line-side transmitter to launch signals to both the clockwise and counter-clockwise fibers. The second coupler has first and second input ports and a first output port coupled to the WDM transponder line-side receiver. The first input port is coupled to the clockwise fiber and the second input port is coupled to the counter-clockwise fiber. The second coupler enables the WDM transponder line-side receiver to receive signals from both the clockwise and counter-clockwise fibers.
- In another embodiment of the present invention, an all optical network for optical signal traffic includes a first ring with at least a first clockwise and a second counter-clockwise fibers and a plurality of network nodes. At least a first add and a first drop broadband couplers are positioned on each fiber. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic. The first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber. A working WDM transponder is coupled to the first ring. The working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the working WDM transponder are connected back to back to a receiver and a transmitter of working client equipment respectively. A protection WDM transponder is coupled to the first ring. The protection WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively. First and second coupler pairs are provided, each with first and second couplers. A 1×2 coupler is configured to launch client optical signals to the WDM working transponder and the WDM protection transponder. A 1×2 coupler is configured to permit client equipment to receive signals from either the working WDM transponder or the protection WDM transponder. A client-side transmitter on the WDM equipment is turned off to reduce coherent cross talk and interference.
- In another embodiment of the present invention, an all optical network for optical signal traffic includes a first ring with at least a first clockwise and a second counter-clockwise fibers and a plurality of network nodes. At least a first add and a first drop broadband couplers are positioned on each fiber. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic. The first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber. A working WDM transponder is coupled to the first ring. The working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the working WDM transponder are connected back to back to a receiver and a transmitter of working client equipment respectively. A protection WDM transponder is coupled to the first ring. The protection WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively. First and second coupler pairs are provided, each with first and second couplers. The first coupler pair is coupled to the working WDM transponder and the second coupler pair is coupled to the protection WDM transponder. The first coupler has first and second output ports and a first input port coupled to the WDM transponder line-side transmitter. The first output port is coupled to the clockwise fiber and the second output port is coupled to the counter-clockwise fiber. The first coupler enables the WDM transponder line-side transmitter to launch signals to both the clockwise and counter-clockwise fibers. The second coupler has first and second input ports and a first output port coupled to the WDM transponder line-side receiver. The first input port is coupled to the clockwise fiber and the second input port is coupled to the counter-clockwise fiber. The second coupler enables the WDM transponder line-side receiver to receive signals from both the clockwise and counter-clockwise fibers. A 1×2 coupler is configured to launch client optical signals to the WDM working transponder and the WDM protection transponder. A 1×2 coupler is configured to permit client equipment to receive signals from either the working WDM transponder or the protection WDM transponder. A client-side transmitter on the WDM equipment is turned off to reduce coherent crosstalk and interference.
- In another embodiment of the present invention, an all optical network for optical signal traffic has a first ring with at least a first clockwise and a second counter-clockwise fibers and a plurality of network nodes. At least a first add and a first drop broadband couplers are coupled to each fiber. Each coupler has first and second ports for through traffic and a third port for adding traffic to or from each ring fiber. The first add and first drop broadband couplers are positioned on the first ring and configured to minimize a pass-through loss in the first ring. A working WDM transponder is coupled to the first ring. The working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the working WDM transponder are connected back to back to a receiver and a transmitter of working client equipment respectively. A protection WDM transponder is coupled to the first ring. The protection WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively. First and second switch pairs are provided, each with first and second switches.
- In another embodiment of the present invention, an all optical network for optical signal traffic has a first ring with at least a first clockwise and a second counter-clockwise fibers and a plurality of network nodes. At least a first add and a first drop broadband couplers are coupled to each fiber. Each coupler has first and second ports for through traffic and a third port for adding traffic to or from each ring fiber. The first add and first drop broadband couplers are positioned on each fiber, and configured to minimize a pass-through loss in each fiber. A working WDM transponder is coupled to the first ring. The working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the working WDM transponder are connected back to back to a receiver and a transmitter of working client equipment respectively. A protection WDM transponder is coupled to the first ring. The protection WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively. First and second switch pairs are provided, each with first and second switches. The first switch pair is coupled to the working WDM transponder and the second switch pair is coupled to the protection WDM transponder. The first switch has first and second output ports and a first input port coupled to the WDM transponder line-side transmitter. The first output port is coupled to the clockwise fiber and the second output port is coupled to the counter-clockwise fiber. The first switch enables the WDM transponder line-side transmitter to launch signals to either the clockwise or counter-clockwise fibers. The second switch has first and second input ports and a first output port coupled to the WDM transponder line-side receiver. The first input port is coupled to the clockwise fiber and the second input port is coupled to the counter-clockwise fiber. The second switch enables the WDM transponder line-side receiver to receive signals from either the clockwise or counter-clockwise fibers.
- In another embodiment of the present invention, an all optical network for optical signal traffic has a first ring with at least a first clockwise and a second counter-clockwise fibers and a plurality of network nodes. At least a first add and a first drop broadband couplers are coupled to each fiber. Each coupler has first and second ports for through traffic and a third port for adding traffic to or from each ring fiber. The first add and first drop broadband couplers are positioned on each fiber and configured to minimize a pass-through loss in each fiber. A working WDM transponder is coupled to the first ring. The working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the working WDM transponder are connected back to back to a receiver and a transmitter of working client equipment respectively. A protection WDM transponder is coupled to the first ring. The protection WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively. First and second switch pairs are provided, each including first and second switches. A 1×2 coupler is configured to launch client optical signals to the WDM working transponder and the WDM protection transponder. A 1×2 coupler is configured to permit client equipment to receive signals from either the working WDM transponder or the protection WDM transponder. A client-side transmitter on the WDM equipment is turned off to reduce coherent crosstalk and interference.
- In another embodiment of the present invention, an all optical network for optical signal traffic has a first ring with at least a first clockwise and a second counter-clockwise fibers and a plurality of network nodes. At least a first add and a first drop broadband couplers are coupled to each fiber. Each coupler has first and second ports for through traffic and a third port for adding traffic to or from each fiber. The first add and first drop broadband couplers are positioned on each fiber and configured to minimize a pass-through loss in each fiber. A working WDM transponder is coupled to the first ring. The working WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the working WDM transponder are connected back to back to a receiver and a transmitter of working client equipment respectively. A protection WDM transponder is coupled to the first ring. The protection WDM transponder includes a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The client side transmitter and the client side receiver of the protection WDM transponder are coupled to a receiver and a transmitter of the protection client side equipment respectively. First and second switch pairs are provided, each including first and second switches. The first switch pair is coupled to the working WDM transponder and the second switch pair is coupled to the protection WDM transponder. The first switch has first and second output ports and a first input port coupled to the WDM transponder line-side transmitter. The first output port is coupled to the clockwise fiber and the second output port being is coupled to the counter-clockwise fiber. The first switch enables the WDM transponder line-side transmitter to launch signals to either the clockwise or counter-clockwise fibers. The second switch has first and second input ports and a first output port coupled to the WDM transponder line-side receiver. The first input port is coupled to the clockwise fiber and the second input port is coupled to the counter-clockwise fiber. The second switch enables the WDM transponder line-side receiver to receive signals from either the clockwise or counter-clockwise fibers. A 1×2 coupler is configured to launch client optical signals to the WDM working transponder and the WDM protection transponder. A 1×2 coupler is configured to permit client equipment to receive signals from either the working WDM transponder or the protection WDM transponder. A client-side transmitter on the WDM equipment is turned off to reduce coherent crosstalk and interference.
-
FIG. 1 (a) illustrates one embodiment of an all optical network of the present invention that uses couplers in each node to protect fibers in a ring. -
FIG. 1 (b) illustrates recovery of theFIG. 1 (a) all optical network after a fiber breaks. -
FIG. 2 (a) illustrates one embodiment of an all optical network of the present invention that uses 1×2 switches in each node to protect fibers in a ring. -
FIG. 2 (b) illustrates recovery of theFIG. 2 (a) all optical network after a fiber breaks. -
FIG. 3 (a) illustrates one embodiment of an all optical network of the present invention that uses couplers in each node to protect client equipment, WDM equipment and fibers in a ring. -
FIG. 3 (b) illustrates recovery of theFIG. 3 (a) all optical network after both a fiber break and WDM equipment failure. -
FIG. 4 (a) illustrates one embodiment of an all optical network of the present invention that uses couplers in each node to protect WDM equipment and fibers in a ring. -
FIG. 4 (b) illustrates recovery of theFIG. 4 (a) all optical network after a fiber breaks. -
FIG. 4 (c) illustrates recovery of theFIG. 4 (a) all optical network after both a fiber break and WDM equipment failure. -
FIG. 5 (a) illustrates one embodiment of an all optical network of the present invention that uses switches in each node to protect client side equipment, WDM equipment and fibers in a ring. -
FIG. 5 (b) illustrates recovery of theFIG. 5 (a) all optical network of SONET equipment when WDM equipment fails. -
FIG. 5 (c) illustrates recovery of theFIG. 5 (a) all optical network after a fiber break. -
FIG. 6 (a) illustrates one embodiment of an all optical network of the present invention that uses switches in each node to protect WDM equipment and fibers in a ring. -
FIG. 6 (b) illustrates recovery of theFIG. 6 (a) all optical network when WDM equipment fails. -
FIG. 6 (c) illustrates recovery of theFIG. 6 (a) all optical network when there is both a fiber break and a failure of WDM equipment. -
FIG. 7 (a) illustrates another embodiment of a broadcast and select metro-optical network architecture with a Hub that contains WDM Muxes, demuxes, transceivers or OEO regenerators and the like. -
FIG. 7 (b) illustrates a break in theFIG. 7 (a) network. -
FIG. 8 (a) illustrates one embodiment of an all-passive optical ring network with broadband/band optical couplers on a ring as add-drop units, and narrowband OAD off the ring. -
FIG. 8 (b) illustrates another embodiment of theFIG. 8 (a) network with linecards added in series. -
FIG. 8 (c) illustrates another embodiment of theFIG. 8 (a) network with linecards added in parallel. -
FIG. 9 (a) is similar to theFIG. 2 (a) embodiment except that four WDM transponders per node are provided, and protections switches are triggered by the bit-error-rate of each transponder. -
FIG. 9 (b) is similar to theFIG. 9 (b) embodiment except that protection switches are triggered by the locally received optical power from the ring. -
FIG. 9 (c) is the same asFIG. 9 (b) except that WDM wavelengths are added in series rather than in parallel. - Referring now to
FIG. 1 (a), an alloptical network 10 for optical signal traffic provides at least afirst ring 12 with at least a firstclockwise fiber 14, a secondcounter-clockwise fiber 16 and a plurality ofnetwork nodes 18. Eachnode 18 has at least aWDM transponder 20 with a line-side transmitter 22 and a client-side receiver 24 in a first direction, and a line-side receiver 26 and a client-side transmitter 28 in an opposing second direction. Line-side receiver 26 can include a fixed or a tunableoptical wavelength filter 30. At least first add and a firstdrop broadband couplers fiber coupler drop broadband couplers fibers - A first coupler pair includes first and
second couplers network node 18.First coupler 36 has first andsecond output ports first input port 44 coupled to a line-side transmitter 22.First output port 40 is coupled toclockwise fiber 14 andsecond output port 42 is coupled tocounter-clockwise fiber 16. First coupler enables the line-side transmitter to launch signals to both clockwise andcounter-clockwise fibers Second coupler 38 has first andsecond input ports first output port 50 coupled to a line-side receiver 26.First input port 48 is coupled toclockwise fiber 14 andsecond input port 46 is coupled tocounter-clockwise fiber 16.Second coupler 38 enables the line-side receiver to receive signals from both clockwise andcounter-clockwise fibers -
FIG. 1 (b) illustrates recovery of alloptical network 10 afterfiber hub 52, an optical switch coupled tofiber 14 and an optical switch coupled tofiber 16 are now closed. These optical switches can be 1×1 or 1×2 switches. - In another embodiment of the present invention illustrated in
FIG. 2 (a), an all optical network 100 for optical signal traffic has afirst ring 110 with at least a clockwise 112 and acounter-clockwise fiber 114 and a plurality ofnetwork nodes 116 . Eachnode 116 has at least aWDM transponder 118 that includes a line-side transmitter 120 and a client-side receiver 122 in a first direction, and a line-side receiver 124 and a client-side transmitter 126 in an opposing second direction. - Line-
side receiver 124 includes a fixed or a tunableoptical wavelength filter 128 . At least a first add and a firstdrop broadband couplers fiber drop broadband couplers first ring 110, and to ensure that he power levels of locally added wavelengths can be equalized to those of through-wavelengths. - A first switch pair includes first and
second switches First switch 140 has first andsecond output ports first input port 148 coupled to line-side transmitter 120.First output port 144 is coupled toclockwise fiber 112 andsecond output port 146 is coupled tocounter-clockwise fiber 114.First switch 140 enables line-side transmitter 120 to launch signals to either clockwise 112 orcounter-clockwise fiber 114.Second switch 142 has first andsecond input ports side receiver 124.First input port 150 is coupled toclockwise fiber 112 andsecond input port 152 is coupled tocounter-clockwise fiber 114.Second switch 142 enables line-side receiver 124 to receive signals from either clockwise orcounter-clockwise fibers fiber 112 and an optical switch coupled tofiber 114 are now open. These optical switches can be 1×1 or 1×2 switches. -
FIG. 2 (b) illustrates recovery of all optical network 100 after a break offiber hub 160, an optical switch coupled tofiber 112 and an optical switch coupled tofiber 114 are now closed.Switches - In another embodiment of the present invention illustrated in
FIG. 3 (a), an alloptical network 200 for optical signal traffic has afirst ring 210 with at least a clockwise and acounter-clockwise fibers network nodes 216. - A working
WDM transponder 228 is coupled tofirst ring 210. WorkingWDM transponder 228 includes a line-side transmitter 230 and a client-side receiver 232 in a first direction, and a line-side receiver 234 and a client-side transmitter 236 in an opposing second direction.Client side transmitter 236 andclient side receiver 232 of workingWDM transponder 228 are coupled to areceiver 238 and atransmitter 240 of the working client side equipment respectively. - A
protection WDM transponder 242 is coupled tofirst ring 210.Protection WDM transponder 242 includes a line-side transmitter 244 and a client-side receiver 246 in a first direction, and a line-side receiver 248 and a client-side transmitter 250 in an opposing second direction.Client side transmitter 250 and theclient side receiver 246 ofprotection WDM transponder 242 are coupled to areceiver 252 and atransmitter 254 of the protection client side equipment respectively. - At most two pairs of couplers are provided on each
fiber drop broadband couplers coupler drop broadband couplers -
First coupler pair WDM transponder 228 andsecond coupler pair protection WDM transponder 242.First coupler 213 of the first pair has first andsecond output ports 274 and 276 and afirst input port 278 coupled to WDM transponder line-side transmitter 230.First output port 274 is coupled toclockwise fiber 212 and second output port 276 is coupled tocounter-clockwise fiber 414. -
First coupler 213 of the first pair enables WDM transponder line-side transmitter 230 to launch signals to both clockwise andcounter-clockwise fibers Second coupler 211 of the first pair has first andsecond input ports first output port 284 coupled to WDM transponder line-side receiver 234.First input port 280 is coupled tocounter-clockwise fiber 214 andsecond input port 282 is coupled toclockwise fiber 212.Second coupler 211 of the first pair enables WDM transponder line-side receiver 234 to receive signals from both clockwise andcounter-clockwise fibers FIG. 3 (a). Note that in each node, the transmitted wavelengths are always different from the selectively received wavelengths. -
FIG. 3 (b) illustrates recovery of alloptical network 200 after both a break of fiber 212 (or 214) and WDM equipment failure. The two switches in the hub are flipped from open to close position. Now in each node, owing to the fact that signals are received and transmitted in both directions, the fiber break is completely bypassed. - In another embodiment of present invention, illustrated in
FIG. 4 (a), an alloptical network 300 for optical signal traffic includes a first ring 310 with at least a first clockwise 312 and a secondcounter-clockwise fibers 314 and a plurality ofnetwork nodes 316. At most two pairs of add and dropbroadband couplers fiber coupler second ports 322 and 324 for through traffic and a third port 326 for adding or dropping local traffic. First add and firstdrop broadband couplers - A working
WDM transponder 328 is coupled to first ring 310. WorkingWDM transponder 328 includes a line-side transmitter 330 and a client-side receiver 332 in a first direction, and a line-side receiver 334 and a client-side transmitter 336 in an opposing second direction.Client side transmitter 336 and client side receiver 332 of workingWDM transponder 328 are connected back to back to areceiver 338 and atransmitter 340 of client equipment respectively. - A
protection WDM transponder 342 is coupled to first ring 310.Protection WDM transponder 342 includes a line-side transmitter 344 and a client-side receiver 346 in a first direction, and a line-side receiver 348 and a client-side transmitter 350 in an opposing second direction.Client side transmitter 350 andclient side receiver 346 ofprotection WDM transponder 342 are coupled to thereceiver 338 and atransmitter 340 of client side equipment respectively. - First and second coupler pairs 356 and 358 are provided, each with first and
second couplers First coupler pair 356 is coupled to workingWDM transponder 328 andsecond coupler pair 358 is coupled toprotection WDM transponder 342.First coupler 360 has first andsecond output ports First output port 364 is coupled toclockwise fiber 312 andsecond output port 366 is coupled tocounter-clockwise fiber 314.First coupler 360 enables WDM transponder line-side transmitter 330 (or 344) to launch signals to both clockwise andcounter-clockwise fibers Second coupler 362 has first andsecond input ports first output port 374 coupled to WDM transponder line-side receiver 334 (or 348).First input port 364 is coupled toclockwise fiber 312 andsecond input port 366 is coupled tocounter-clockwise fiber 314.Second coupler 362 enables WDM transponder line-side receiver 334 (or 348) receive signals from both clockwise andcounter-clockwise fibers FIG. 4 (a). - A 1×2
coupler 376 is configured to launch client optical signals toWDM working transponder 328 andWDM protection transponder 342. A 1×2coupler 378 is configured to permit client equipment to receive signals from either workingWDM transponder 328 orprotection WDM transponder 342 because a client-side transmitter on WDM equipment is turned off to reduce coherent crosstalk and interference. -
FIG. 4 (b) illustrates recovery of alloptical network 300 after a break offiber FIG. 4 (c) illustrates recovery of alloptical network 300 after both afiber break - In another embodiment of present invention, illustrated in
FIG. 5 (a), an all optical network 400 for optical signal traffic has a first ring 410 with at least a first clockwise 412 and a secondcounter-clockwise fibers 414 and a plurality ofnetwork nodes 416. At most two pairs ofbroadband couplers fiber coupler - A working
WDM transponder 434 is coupled to first ring 410. WorkingWDM transponder 434 includes a line-side transmitter 436 and a client-side receiver 438 in a first direction, and a line-side receiver 440 and a client-side transmitter 442 in an opposing second direction.Client side transmitter 442 andclient side receiver 438 of workingWDM transponder 434 are connected back to back to areceiver 444 and atransmitter 446 of working client equipment respectively. An exactly the same arrangement is installed for protection WDM and client equipment, as shown inFIG. 5 (a). - First and second switch pairs 464 and 466 are provided, each with first and
second switches First switch pair 464 is coupled to workingWDM transponder 434 andsecond switch pair 466 is coupled toprotection WDM transponder 448.First switch 470 has first and second output-ports First output port 474 is coupled toclockwise fiber 412 andsecond output port 476 is coupled tocounter-clockwise fiber 414.First switch 470 enables WDM transponder line-side transmitter 436 to launch signals to either clockwise orcounter-clockwise fibers Second switch 472 has first andsecond input ports first output port 484 coupled to WDM transponder line-side receiver 440.First input port 480 is coupled toclockwise fiber 414 andsecond input port 482 is coupled tocounter-clockwise fiber 412.Second switch 472 enables WDM transponder line-side receiver 440 to receive signals from either clockwise orcounter-clockwise fibers -
FIG. 5 (b) illustrates recovery of all optical network 400 of SONET equipment when WDM equipment fails. No switches are activated in this case.FIG. 5 (c) illustrates recovery of all optical network 400 after a break offiber - In another embodiment of present invention, illustrated in
FIG. 6 (a), an all optical network 500 for optical signal traffic has a first ring 510 with at least a first clockwise 512 and a secondcounter-clockwise fiber 514 and a plurality ofnetwork nodes 516. At most two pairs ofbroadband couplers coupler drop broadband couplers fiber - A working
WDM transponder 528 is coupled to first ring 510. WorkingWDM transponder 528 includes a line-side transmitter 530 and a client-side receiver 532 in a first direction, and a line-side receiver 534 and a client-side transmitter 536 in an opposing second direction.Client side transmitter 536 andclient side receiver 532 of workingWDM transponder 528 are connected back to back to areceiver 538 and atransmitter 540 of client equipment. The same arrangement is installed at theprotection WDM transponder 542, as shown inFIG. 6 (a). - First and second switch pairs 556 and 558 are provided, each including first and
second switches coupler 564 is configured to launch client optical signals toWDM working transponder 528 andWDM protection transponder 542. A 1×2coupler 568 is configured to permit client equipment to receive signals from either workingWDM transponder 528 orprotection WDM transponder 542, because a client-side transmitter on WDM equipment is turned off to reduce coherent crosstalk and interference. -
First switch pair 556 is coupled to workingWDM transponder 528 andsecond switch pair 558 is coupled toprotection WDM transponder 542.First switch 560 has first andsecond output ports first input port 574 coupled to WDM transponder line-side transmitter 530.First output port 570 is coupled toclockwise fiber 512 andsecond output port 572 is coupled tocounter-clockwise fiber 514.First switch 560 enables WDM transponder line-side transmitter 530 to launch signals to either clockwise orcounter-clockwise fibers Second switch 562 has first andsecond input ports first output 580 port coupled to WDM transponder line-side receiver 534.First input port 576 is coupled tocounter-clockwise fiber 514 andsecond input port 578 is coupled toclockwise fiber 512.Second switch 562 enables WDM transponder line-side receiver 534 to receive signals from either clockwise orcounter-clockwise fibers -
FIG. 6 (b) illustrates recovery of all optical network 500 when WDM equipment fails and no switches are activated.FIG. 6 (c) illustrates recovery of all optical network 500 when there is both a break of afiber - Referring now to
FIG. 7 (a),ring 610 is provided. When the transmitted signal in the central location is sent simultaneously tofibers switch 616 can be located at every node so that the receiver receives eitherfiber fiber optical switch 616 to switch to a different port, as shown inFIG. 7 (b). In network architecture ofFIG. 7 (a) and 7(b), there are no open switches, as distinguished from the embodiments of FIGS. 1(a)-6(c), onfibers ring 610. - The embodiments of FIGS. 7(a) and 7(b) can also be configured such that the transmitter in the central hub is connected to a 1×2 switch rather than a 1×2 coupler, and the receiver in each node is connected to a 1×2 coupler rather than a 1×2 switch.
- In another embodiment of the present invention, illustrated in FIGS. 8(a)-8(c), an all-passive broadcast and
select ring network 710 is provided, withfibers passive ring 710 requires that a round-trip transmission loss must be kept at a certain level so that the recirculated signal does not cause a significant coherent cross-talk penalty. In this embodiment, open switches are not required, as distinguished from the embodiments of FIGS. 1(a)-6(c). However, the near-end/far-end adjacent cancel cross-talk is avoided by designing all optical add-drop filters with sharp enough roll-offs. This is a condition that can occur when a node receives signals from both a neighbor node, which sends a strong signal, and a remote node, which sends a weak signal. This condition also occurs where these two signals are adjacent to each other in terms of wavelength. - In
FIG. 8 (b),multiple WDM transponders 716 in each node are combined in series by using cascaded optical add-drop filters (OAD's) 718 in both the add and drop directions. In theFIG. 8 (c) embodiment,multiple WDM transponders 716 in each node are combined by multi-port broadband power combiners in parallel. - The embodiment or
ring 810 withfibers FIG. 9 (a) and 9(b), is similar to FIGS. 2(a) and 2(b) except that fourWDM transponders 816 per node are utilized. In this embodiment, eachWDM transponder 816 has its own opticalprotection switch pair 818. Eachswitch pair 818 is triggered by the high bit-error-rate in thecorresponding WDM transponder 816. EachWDM transponder 816 shares the sameprotection switch pair 818 in each node. Switch pairs 818 is triggered by the locally received optical power fromring 810.FIG. 9 (c) is the same asFIG. 9 (b), except that WDM wavelengths are added in series rather than in parallel. - FIGS. 9(a) through 9(c) also illustrate where and how all the wavelengths on
ring 810 are equalized. At each node, there are four reference points AW, AE, DW, and DE at the input offibers - If the inter-node distance is very short, the drop amplifier or both amplifiers in each node in each direction can be eliminated. If only the drop amplifier is eliminated, the only reference point needed in each direction then is at the input of the add amplifier. If both amplifiers in each node are eliminated, then the locally added wavelength power should be equalized at the next node where there is an inline amplifier.
- While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiment, but on the contrary it is intended to cover various modifications and equivalent arrangement included within the spirit and scope of the claims which follow.
Claims (59)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/338,088 US7499647B2 (en) | 2000-05-22 | 2003-01-06 | Fully protected broadcast and select all optical network |
PCT/US2004/000260 WO2004064259A2 (en) | 2003-01-06 | 2004-01-06 | Fully protected broadcast and select all optical network |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/575,811 US6525857B1 (en) | 2000-03-07 | 2000-05-22 | Method and apparatus for interleaved optical single sideband modulation |
US09/990,196 US6895184B2 (en) | 2000-05-22 | 2001-11-21 | Interconnected broadcast and select optical networks with shared wavelengths |
US34678602P | 2002-01-07 | 2002-01-07 | |
US10/338,088 US7499647B2 (en) | 2000-05-22 | 2003-01-06 | Fully protected broadcast and select all optical network |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/575,811 Continuation-In-Part US6525857B1 (en) | 2000-03-07 | 2000-05-22 | Method and apparatus for interleaved optical single sideband modulation |
US09/990,196 Continuation-In-Part US6895184B2 (en) | 2000-05-22 | 2001-11-21 | Interconnected broadcast and select optical networks with shared wavelengths |
Publications (3)
Publication Number | Publication Date |
---|---|
US20030180047A1 US20030180047A1 (en) | 2003-09-25 |
US20060275034A9 true US20060275034A9 (en) | 2006-12-07 |
US7499647B2 US7499647B2 (en) | 2009-03-03 |
Family
ID=32710961
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/338,088 Expired - Lifetime US7499647B2 (en) | 2000-05-22 | 2003-01-06 | Fully protected broadcast and select all optical network |
Country Status (2)
Country | Link |
---|---|
US (1) | US7499647B2 (en) |
WO (1) | WO2004064259A2 (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070206493A1 (en) * | 2002-03-27 | 2007-09-06 | Fujitsu Limited | Flexible Open Ring Optical Network and Method |
US20090074403A1 (en) * | 2007-09-19 | 2009-03-19 | Industrial Technology Research Institute | Self-healing ring-based passive optical network |
US7570886B1 (en) * | 2003-03-14 | 2009-08-04 | Afferton Thomas S | Network with optical bandwidth on demand |
US20100052778A1 (en) * | 2008-08-28 | 2010-03-04 | Dalius Baranauskas | Nth Order Tunable Low-Pass Continuous Time Filter for Fiber Optic Receivers |
US8509618B2 (en) | 2009-05-06 | 2013-08-13 | Ciena Corporation | Photonic routing systems and methods for loop avoidance |
US8554074B2 (en) | 2009-05-06 | 2013-10-08 | Ciena Corporation | Colorless, directionless, and gridless optical network, node, and method |
US20130336653A1 (en) * | 2012-06-13 | 2013-12-19 | Peter Öhlén | Methods and apparatus for a passive access subnetwork |
US8929738B2 (en) | 2012-05-30 | 2015-01-06 | Telefonaktiebolaget L M Ericsson (Publ) | Resilience in an access subnetwork ring |
US9002194B2 (en) | 2012-04-09 | 2015-04-07 | Telefonaktiebolaget L M Ericsson (Publ) | Optical-layer multipath protection for optical network |
US9083484B2 (en) | 2012-02-13 | 2015-07-14 | Ciena Corporation | Software defined networking photonic routing systems and methods |
US9252912B2 (en) | 2012-04-09 | 2016-02-02 | Telefonaktiebolaget L M Ericsson (Publ) | Method for routing and spectrum assignment |
US9451343B2 (en) | 2015-01-30 | 2016-09-20 | Ciena Corporation | Control plane extensions for optical broadcast networks |
TWI682627B (en) * | 2017-11-22 | 2020-01-11 | 日商三菱電機股份有限公司 | Data transmission device and data transmission method |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7120359B2 (en) * | 2000-05-22 | 2006-10-10 | Opvista Incorporated | Broadcast and select all optical network |
US7421197B2 (en) * | 2003-01-21 | 2008-09-02 | Fujitsu Limited | Optical network protection switching architecture |
US7848644B2 (en) * | 2004-02-23 | 2010-12-07 | Dynamic Method Enterprises Limited | Method and an apparatus to provide optical equipment protection |
US7577367B2 (en) * | 2004-06-15 | 2009-08-18 | Op Vista Incorporated | Optical communication using duobinary modulation |
WO2006119375A2 (en) * | 2005-05-02 | 2006-11-09 | Opvista, Incorporated | Multiple interconnected broadcast and select optical ring networks with revertible protection switch |
US7957270B2 (en) * | 2005-06-27 | 2011-06-07 | At&T Intellectual Property I, L.P. | Resilient packet ring protection over a wavelength division multiplexing network |
US8139476B2 (en) * | 2005-10-13 | 2012-03-20 | Vello Systems, Inc. | Optical ring networks using circulating optical probe in protection switching with automatic reversion |
US7773883B1 (en) | 2007-05-04 | 2010-08-10 | Vello Systems, Inc. | Single-fiber optical ring networks based on optical double sideband modulation |
US8175458B2 (en) | 2007-07-17 | 2012-05-08 | Vello Systems, Inc. | Optical ring networks having node-to-node optical communication channels for carrying data traffic |
US20100021166A1 (en) * | 2008-02-22 | 2010-01-28 | Way Winston I | Spectrally Efficient Parallel Optical WDM Channels for Long-Haul MAN and WAN Optical Networks |
US20110158658A1 (en) | 2009-12-08 | 2011-06-30 | Vello Systems, Inc. | Optical Subchannel-Based Cyclical Filter Architecture |
US8705741B2 (en) | 2010-02-22 | 2014-04-22 | Vello Systems, Inc. | Subchannel security at the optical layer |
WO2012057749A1 (en) * | 2010-10-27 | 2012-05-03 | Hewlett-Packard Development Company, L.P. | Receivers and transceivers for optical multibus systems |
US8542999B2 (en) | 2011-02-01 | 2013-09-24 | Vello Systems, Inc. | Minimizing bandwidth narrowing penalties in a wavelength selective switch optical network |
US8965198B2 (en) * | 2012-04-13 | 2015-02-24 | Fujitsu Limited | System and method for shared mesh restoration in optical networks |
US20150222385A1 (en) * | 2012-07-26 | 2015-08-06 | Telefonaktiebolaget L M Ericsson (Publ) | Transponder for wdm ring network |
JP2014183482A (en) * | 2013-03-19 | 2014-09-29 | Fujitsu Ltd | Transmission/reception system, transmission device, reception device, and control method for transmission/reception system |
IN2013MU01980A (en) * | 2013-06-10 | 2015-05-29 | Indian Inst Technology Bombay | |
US9432751B2 (en) | 2013-09-30 | 2016-08-30 | Microsemi Communications, Inc. | PTP transparent clock system upgrade solution |
US9960878B2 (en) * | 2013-10-01 | 2018-05-01 | Indian Institute Of Technology Bombay | Scalable ultra dense hypergraph network for data centers |
KR20150054232A (en) * | 2013-11-11 | 2015-05-20 | 한국전자통신연구원 | Method and Apparatus for Optical Signal Control using Filter in Multicasting Ring Network Node and Protection Switching in Optical Multiplex Section |
KR101631651B1 (en) * | 2013-12-04 | 2016-06-20 | 주식회사 쏠리드 | Optical Repeater of Ring Topology type |
WO2017146718A1 (en) * | 2016-02-26 | 2017-08-31 | Hewlett Packard Enterprise Development Lp | Ring protection network division |
WO2020088784A1 (en) * | 2018-11-02 | 2020-05-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Optical protection switching for single fibre bidirectional wdm optical ring |
EP4042606A1 (en) * | 2019-10-10 | 2022-08-17 | Infinera Corporation | Optical subcarrier dual-path protection and restoration for optical communications networks |
JP2022014092A (en) * | 2020-07-06 | 2022-01-19 | 富士通株式会社 | Optical transmission device and optical transmission method |
EP4009554A1 (en) * | 2020-12-01 | 2022-06-08 | Deutsche Telekom AG | System and method providing failure protection based on a faulty port in an aggregation network being an optical transport network |
Citations (89)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5101450A (en) * | 1991-01-23 | 1992-03-31 | Gte Laboratories Incorporated | Quadrature optical phase modulators for lightwave systems |
US5239401A (en) * | 1990-12-31 | 1993-08-24 | Gte Laboratories Incorporated | Optical modulator for cancellation of second-order intermodulation products in lightwave systems |
US5301058A (en) * | 1990-12-31 | 1994-04-05 | Gte Laboratories Incorporated | Single sideband optical modulator for lightwave systems |
US5333000A (en) * | 1992-04-03 | 1994-07-26 | The United States Of America As Represented By The United States Department Of Energy | Coherent optical monolithic phased-array antenna steering system |
US5390188A (en) * | 1993-08-02 | 1995-02-14 | Synoptics | Method and apparatus for measuring and monitoring the performance within a ring communication network |
US5442623A (en) * | 1992-08-17 | 1995-08-15 | Bell Communications Research, Inc. | Passive protected self healing ring network |
US5509093A (en) * | 1993-10-13 | 1996-04-16 | Micron Optics, Inc. | Temperature compensated fiber fabry-perot filters |
US5539559A (en) * | 1990-12-18 | 1996-07-23 | Bell Communications Research Inc. | Apparatus and method for photonic contention resolution in a large ATM switch |
US5546210A (en) * | 1994-02-18 | 1996-08-13 | At&T Corp. | Multi-channel optical fiber communication system |
US5596436A (en) * | 1995-07-14 | 1997-01-21 | The Regents Of The University Of California | Subcarrier multiplexing with dispersion reduction and direct detection |
US5600466A (en) * | 1994-01-26 | 1997-02-04 | British Telecommunications Public Limited Company | Wavelength division optical signalling network apparatus and method |
US5608825A (en) * | 1996-02-01 | 1997-03-04 | Jds Fitel Inc. | Multi-wavelength filtering device using optical fiber Bragg grating |
US5617233A (en) * | 1995-09-28 | 1997-04-01 | The United States Of America As Represented By The Secretary Of The Air Force | Transparent optical node structure |
US5625478A (en) * | 1995-09-14 | 1997-04-29 | Lucent Technologies Inc. | Optically restorable WDM ring network using simple add/drop circuitry |
US5663820A (en) * | 1994-12-28 | 1997-09-02 | Nec Corporation | Optical network using multiplexed payload and OAM signals |
US5680235A (en) * | 1995-04-13 | 1997-10-21 | Telefonaktiebolaget Lm Ericsson | Optical multichannel system |
US5710650A (en) * | 1996-03-14 | 1998-01-20 | Alcatel Network Systems, Inc. | Dispersion-reducing multiple wavelength division multiplexing optical fiber transceiver and methods for using and assembling same |
US5712716A (en) * | 1994-11-25 | 1998-01-27 | Pirelli Cavi S.P.A. | Telecommunication system and method for wavelength-division multiplexing transmissions with a controlled separation of the outgoing channels and capable of determining the optical signal/noise ratio |
US5717795A (en) * | 1994-02-17 | 1998-02-10 | Kabushiki Kaisha Toshiba | Optical wavelength division multiplexed network system |
US5734493A (en) * | 1996-11-01 | 1998-03-31 | Lucent Technologies Inc. | Optical frequency conversion device |
US5742416A (en) * | 1996-03-28 | 1998-04-21 | Ciena Corp. | Bidirectional WDM optical communication systems with bidirectional optical amplifiers |
US5745273A (en) * | 1996-11-27 | 1998-04-28 | Lucent Technologies Inc. | Device for single sideband modulation of an optical signal |
US5764821A (en) * | 1994-02-06 | 1998-06-09 | Lucent Technologies Inc. | Large capacity local access network |
US5778118A (en) * | 1996-12-03 | 1998-07-07 | Ciena Corporation | Optical add-drop multiplexers for WDM optical communication systems |
US5781327A (en) * | 1996-08-19 | 1998-07-14 | Trw Inc. | Optically efficient high dynamic range electro-optic modulator |
US5784184A (en) * | 1995-05-11 | 1998-07-21 | Ciena Corporation | WDM Optical communication systems with remodulators and remodulating channel selectors |
US5786913A (en) * | 1995-08-10 | 1998-07-28 | Alcatel Nv | Optical TDMA ring network with a central transmitting and receiving device |
US5796501A (en) * | 1995-07-12 | 1998-08-18 | Alcatel N.V. | Wavelength division multiplexing optical communication network |
US5822095A (en) * | 1995-09-19 | 1998-10-13 | Kokusai Denshin Denwa Kabushiki Kaisha | Optical add-drop multiplexer |
US5870212A (en) * | 1998-01-14 | 1999-02-09 | Mciworldcom, Inc. | Self-healing optical network |
US5880870A (en) * | 1996-10-21 | 1999-03-09 | Telecommunications Research Laboratories | Optical modulation system |
US5917638A (en) * | 1997-02-13 | 1999-06-29 | Lucent Technologies, Inc. | Duo-binary signal encoding |
US5940197A (en) * | 1996-04-02 | 1999-08-17 | Kokusai Denshin Denwa Kabushiki Kaisha | Optical add-drop device |
US5938309A (en) * | 1997-03-18 | 1999-08-17 | Ciena Corporation | Bit-rate transparent WDM optical communication system with remodulators |
US5949273A (en) * | 1996-07-12 | 1999-09-07 | Semikron Elektronik Gmbh | Short circuit protection for parallel connected devices |
US5949560A (en) * | 1997-02-05 | 1999-09-07 | Northern Telecom Limited | Optical transmission system |
US5953141A (en) * | 1996-10-03 | 1999-09-14 | International Business Machines Corporation | Dynamic optical add-drop multiplexers and wavelength-routing networks with improved survivability and minimized spectral filtering |
US6023359A (en) * | 1996-10-04 | 2000-02-08 | Nec Corporation | Optical wavelength-division multiplex transmission equipment with a ring structure |
US6035080A (en) * | 1997-06-20 | 2000-03-07 | Henry; Charles Howard | Reconfigurable add-drop multiplexer for optical communications systems |
US6069732A (en) * | 1994-12-14 | 2000-05-30 | Lucent Technologies Inc. | Semiconductor interferometric optical wavelength conversion device |
US6084694A (en) * | 1997-08-27 | 2000-07-04 | Nortel Networks Corporation | WDM optical network with passive pass-through at each node |
US6088141A (en) * | 1995-06-26 | 2000-07-11 | Telefonaktiebolaget Lm Ericsson | Self-healing network |
US6089694A (en) * | 1996-12-17 | 2000-07-18 | Canon Kabushiki Kaisha | Ink jet head and an ink jet apparatus |
US6118566A (en) * | 1998-11-04 | 2000-09-12 | Corvis Corporation | Optical upconverter apparatuses, methods, and systems |
US6130766A (en) * | 1999-01-07 | 2000-10-10 | Qtera Corporation | Polarization mode dispersion compensation via an automatic tracking of a principal state of polarization |
US6192173B1 (en) * | 1999-06-02 | 2001-02-20 | Nortel Networks Limited | Flexible WDM network architecture |
US6191854B1 (en) * | 1997-06-23 | 2001-02-20 | Pirelli Cavi E Sistemi S.P.A. | Optical telecommunications system |
US6195351B1 (en) * | 1998-01-28 | 2001-02-27 | 3Com Corporation | Logical switch set |
US6195186B1 (en) * | 1996-12-04 | 2001-02-27 | Nec Corporation | Optical WDM ring network |
US6201909B1 (en) * | 1996-10-25 | 2001-03-13 | Arroyo Optics, Inc. | Wavelength selective optical routers |
US6208441B1 (en) * | 1995-08-04 | 2001-03-27 | Alcatel | Optical add/drop wavelength division multiplex systems |
US6211980B1 (en) * | 1998-01-30 | 2001-04-03 | Fujitsu Limited | Bi-directional wavelength switching device and wavelength demultiplexing/multiplexing device |
US6222654B1 (en) * | 1997-08-04 | 2001-04-24 | Lucent Technologies, Inc. | Optical node system for a ring architecture and method thereof |
US6259836B1 (en) * | 1998-05-14 | 2001-07-10 | Telecommunications Research Laboratories | Optical frequency shifter and transmission system |
US6271946B1 (en) * | 1999-01-25 | 2001-08-07 | Telcordia Technologies, Inc. | Optical layer survivability and security system using optical label switching and high-speed optical header generation and detection |
US6285479B1 (en) * | 1997-10-20 | 2001-09-04 | Fujitsu Limited | Optical cross connect unit, optical add-drop multiplexer, light source unit, and adding unit |
US6339663B1 (en) * | 2000-12-22 | 2002-01-15 | Seneca Networks, Inc. | Bidirectional WDM optical communication system with bidirectional optical service channels |
US20020012148A1 (en) * | 1999-03-12 | 2002-01-31 | Nokia Networks Oy | Dispersion compensation in optical communication network and optical communication network |
US20020015553A1 (en) * | 2000-05-18 | 2002-02-07 | Claringburn Harry R. | Radiation power equalizer |
US20020023170A1 (en) * | 2000-03-02 | 2002-02-21 | Seaman Michael J. | Use of active topology protocols, including the spanning tree, for resilient redundant connection of an edge device |
US6351323B1 (en) * | 1998-04-02 | 2002-02-26 | Fujitsu Limited | Optical transmission apparatus, optical transmission system, and optical terminal station |
US20020030877A1 (en) * | 2000-03-07 | 2002-03-14 | Winston Way | Method and apparatus for interleaved optical single sideband modulation |
US6369923B1 (en) * | 1999-09-07 | 2002-04-09 | Cinta Corporation | Multiwavelength stabilization with a single reference comb filter in DWDM systems |
US6385204B1 (en) * | 1999-11-22 | 2002-05-07 | Worldcom, Inc. | Network architecture and call processing system |
US20020063928A1 (en) * | 1998-08-31 | 2002-05-30 | Per Bang Hansen | Filtering of data-encoded optical signals |
US20020067523A1 (en) * | 2000-05-22 | 2002-06-06 | Winston Way | Interconnected broadcast and select optical networks with shared wavelengths |
US6404535B1 (en) * | 1998-11-30 | 2002-06-11 | Trw Inc. | Optically implemented wideband complex correlator using a multi-mode imaging device |
US20020080440A1 (en) * | 2000-03-07 | 2002-06-27 | Corning Incorporated | Protection switch in a single two-fiber optical channel shared protection ring |
US6433904B1 (en) * | 1999-07-27 | 2002-08-13 | Sycamore Networks, Inc. | Method and apparatus for improving transmission performance over wavelength division multiplexed optical communication links using forward error correction coding |
US20020114034A1 (en) * | 2000-05-22 | 2002-08-22 | Winston Way | Split wave method and apparatus for transmitting data in long-haul optical fiber systems |
US20020126350A1 (en) * | 2001-03-06 | 2002-09-12 | Fujitsu Limited | Optical path cross-connect and optical wavelength multiplexing diversity communication system using the same |
US20020135838A1 (en) * | 2000-09-11 | 2002-09-26 | Way Winston I. | Dynamic wavelength add/drop multiplexer for UDWDM optical communication system |
US20030025961A1 (en) * | 2000-05-22 | 2003-02-06 | Winston Way | Broadcast and select all optical network |
US6556744B1 (en) * | 2001-10-12 | 2003-04-29 | Nortel Networks Limited | Reduction of dispersion effects in optical transmission fibre systems |
US6560252B1 (en) * | 2000-07-20 | 2003-05-06 | Jds Uniphase Inc. | Method and device for wavelength locking |
US6580537B1 (en) * | 1998-07-17 | 2003-06-17 | Regents Of The University Of California, The | High-throughput, low-latency next generation internet networks using optical label switching and high-speed optical header generation, detection and reinsertion |
US6590681B1 (en) * | 1998-06-10 | 2003-07-08 | Telefonaktiebolaget Lm Ericsson | Optical WDM network having an efficient use of wavelengths and a node therefor |
US20030169470A1 (en) * | 2000-11-07 | 2003-09-11 | Oni Systems Corp. | Method and system for bi-directional path switched network |
US6701085B1 (en) * | 1997-07-22 | 2004-03-02 | Siemens Aktiengesellschaft | Method and apparatus for data transmission in the wavelength-division multiplex method in an optical ring network |
US20050018600A1 (en) * | 2000-10-31 | 2005-01-27 | Massimiliano Tornar | IP multi-homing |
US20050025490A1 (en) * | 2003-07-28 | 2005-02-03 | Fujitsu Network Communications, Inc. | Optical network with sub-band rejection and bypass |
US20050078965A1 (en) * | 2003-10-14 | 2005-04-14 | Hoon Kim | RZ-AMI optical transmitter module |
US6891981B2 (en) * | 1998-11-04 | 2005-05-10 | Corvis Corporation | Optical transmission apparatuses, methods, and systems |
US20050158047A1 (en) * | 2003-07-16 | 2005-07-21 | Way Winston I. | Optical ring networks with failure protection mechanisms |
US20050185969A1 (en) * | 2004-02-19 | 2005-08-25 | Moeller Lothar Benedict E.J. | Method and apparatus for processing optical duobinary signals |
US20050201762A1 (en) * | 2004-03-12 | 2005-09-15 | Moeller Lothar Benedict E.J. | Optical RZ-duobinary transmission system with narrow bandwidth optical filter |
US20060051092A1 (en) * | 2000-09-11 | 2006-03-09 | Winston Way | In-band wavelength conversion wavelength buffering and multi-protocol lambda switching |
US7068949B2 (en) * | 2000-09-07 | 2006-06-27 | Korea Advanced Institute Of Science & Technology | Multi-wavelength locking method and apparatus for wavelength division multiplexing (WDM) optical communication system |
US20070086332A1 (en) * | 2005-10-13 | 2007-04-19 | Way Winston I | Optical ring networks using circulating optical probe in protection switching with automatic reversion |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5062684A (en) | 1990-01-17 | 1991-11-05 | At&T Bell Laboratories | Optical fiber filter |
JP3396270B2 (en) | 1993-08-10 | 2003-04-14 | 富士通株式会社 | Optical dispersion compensation method |
IT1265018B1 (en) | 1993-08-10 | 1996-10-17 | Cselt Centro Studi Lab Telecom | DEVICE FOR EXTRACTION AND REINSERTION OF AN OPTICAL CARRIER IN OPTICAL COMMUNICATION NETWORKS. |
JP3434869B2 (en) | 1994-02-07 | 2003-08-11 | 株式会社日立製作所 | Optical regenerative repeater and optical transmission device |
DE19514386A1 (en) | 1995-04-19 | 1996-10-24 | Hertz Inst Heinrich | Optical frequency generator |
US5982518A (en) | 1996-03-27 | 1999-11-09 | Ciena Corporation | Optical add-drop multiplexers compatible with very dense WDM optical communication systems |
DE19730830A1 (en) | 1997-07-18 | 1999-01-21 | Alsthom Cge Alcatel | Laser for generating a wave crest |
US6657952B1 (en) | 1997-11-28 | 2003-12-02 | Nec Corporation | Ring network for sharing protection resource by working communication paths |
US5982963A (en) | 1997-12-15 | 1999-11-09 | University Of Southern California | Tunable nonlinearly chirped grating |
US6466342B1 (en) | 1999-02-18 | 2002-10-15 | At&T Corp. | Optical transmission system and method using an optical carrier drop/add transceiver |
US6661976B1 (en) | 2000-01-05 | 2003-12-09 | At&T Corp. | Method and system for single-sideband optical signal generation and transmission |
JP4646048B2 (en) | 2001-03-02 | 2011-03-09 | 日本電気株式会社 | Single sideband signal light generation method and single sideband signal light generation circuit |
US7116905B2 (en) * | 2002-03-27 | 2006-10-03 | Fujitsu Limited | Method and system for control signaling in an open ring optical network |
-
2003
- 2003-01-06 US US10/338,088 patent/US7499647B2/en not_active Expired - Lifetime
-
2004
- 2004-01-06 WO PCT/US2004/000260 patent/WO2004064259A2/en active Application Filing
Patent Citations (99)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5539559A (en) * | 1990-12-18 | 1996-07-23 | Bell Communications Research Inc. | Apparatus and method for photonic contention resolution in a large ATM switch |
US5239401A (en) * | 1990-12-31 | 1993-08-24 | Gte Laboratories Incorporated | Optical modulator for cancellation of second-order intermodulation products in lightwave systems |
US5301058A (en) * | 1990-12-31 | 1994-04-05 | Gte Laboratories Incorporated | Single sideband optical modulator for lightwave systems |
US5101450A (en) * | 1991-01-23 | 1992-03-31 | Gte Laboratories Incorporated | Quadrature optical phase modulators for lightwave systems |
US5333000A (en) * | 1992-04-03 | 1994-07-26 | The United States Of America As Represented By The United States Department Of Energy | Coherent optical monolithic phased-array antenna steering system |
US5442623A (en) * | 1992-08-17 | 1995-08-15 | Bell Communications Research, Inc. | Passive protected self healing ring network |
US5390188A (en) * | 1993-08-02 | 1995-02-14 | Synoptics | Method and apparatus for measuring and monitoring the performance within a ring communication network |
US5509093A (en) * | 1993-10-13 | 1996-04-16 | Micron Optics, Inc. | Temperature compensated fiber fabry-perot filters |
US5600466A (en) * | 1994-01-26 | 1997-02-04 | British Telecommunications Public Limited Company | Wavelength division optical signalling network apparatus and method |
US5764821A (en) * | 1994-02-06 | 1998-06-09 | Lucent Technologies Inc. | Large capacity local access network |
US5717795A (en) * | 1994-02-17 | 1998-02-10 | Kabushiki Kaisha Toshiba | Optical wavelength division multiplexed network system |
US5546210A (en) * | 1994-02-18 | 1996-08-13 | At&T Corp. | Multi-channel optical fiber communication system |
US5712716A (en) * | 1994-11-25 | 1998-01-27 | Pirelli Cavi S.P.A. | Telecommunication system and method for wavelength-division multiplexing transmissions with a controlled separation of the outgoing channels and capable of determining the optical signal/noise ratio |
US6069732A (en) * | 1994-12-14 | 2000-05-30 | Lucent Technologies Inc. | Semiconductor interferometric optical wavelength conversion device |
US5663820A (en) * | 1994-12-28 | 1997-09-02 | Nec Corporation | Optical network using multiplexed payload and OAM signals |
US5680235A (en) * | 1995-04-13 | 1997-10-21 | Telefonaktiebolaget Lm Ericsson | Optical multichannel system |
US5784184A (en) * | 1995-05-11 | 1998-07-21 | Ciena Corporation | WDM Optical communication systems with remodulators and remodulating channel selectors |
US6088141A (en) * | 1995-06-26 | 2000-07-11 | Telefonaktiebolaget Lm Ericsson | Self-healing network |
US5896212A (en) * | 1995-07-12 | 1999-04-20 | Alcatel N.V. | Wavelength division multiplexing optical communication network |
US5796501A (en) * | 1995-07-12 | 1998-08-18 | Alcatel N.V. | Wavelength division multiplexing optical communication network |
US5596436A (en) * | 1995-07-14 | 1997-01-21 | The Regents Of The University Of California | Subcarrier multiplexing with dispersion reduction and direct detection |
US6208441B1 (en) * | 1995-08-04 | 2001-03-27 | Alcatel | Optical add/drop wavelength division multiplex systems |
US5786913A (en) * | 1995-08-10 | 1998-07-28 | Alcatel Nv | Optical TDMA ring network with a central transmitting and receiving device |
US5625478A (en) * | 1995-09-14 | 1997-04-29 | Lucent Technologies Inc. | Optically restorable WDM ring network using simple add/drop circuitry |
US5923449A (en) * | 1995-09-14 | 1999-07-13 | Lucent Technologies Inc. | Optically restorable WDM ring network using simple add/drop circuitry |
US5822095A (en) * | 1995-09-19 | 1998-10-13 | Kokusai Denshin Denwa Kabushiki Kaisha | Optical add-drop multiplexer |
US5617233A (en) * | 1995-09-28 | 1997-04-01 | The United States Of America As Represented By The Secretary Of The Air Force | Transparent optical node structure |
US5608825A (en) * | 1996-02-01 | 1997-03-04 | Jds Fitel Inc. | Multi-wavelength filtering device using optical fiber Bragg grating |
US5710650A (en) * | 1996-03-14 | 1998-01-20 | Alcatel Network Systems, Inc. | Dispersion-reducing multiple wavelength division multiplexing optical fiber transceiver and methods for using and assembling same |
US5742416A (en) * | 1996-03-28 | 1998-04-21 | Ciena Corp. | Bidirectional WDM optical communication systems with bidirectional optical amplifiers |
US5940197A (en) * | 1996-04-02 | 1999-08-17 | Kokusai Denshin Denwa Kabushiki Kaisha | Optical add-drop device |
US5949273A (en) * | 1996-07-12 | 1999-09-07 | Semikron Elektronik Gmbh | Short circuit protection for parallel connected devices |
US5781327A (en) * | 1996-08-19 | 1998-07-14 | Trw Inc. | Optically efficient high dynamic range electro-optic modulator |
US5953141A (en) * | 1996-10-03 | 1999-09-14 | International Business Machines Corporation | Dynamic optical add-drop multiplexers and wavelength-routing networks with improved survivability and minimized spectral filtering |
US6023359A (en) * | 1996-10-04 | 2000-02-08 | Nec Corporation | Optical wavelength-division multiplex transmission equipment with a ring structure |
US5880870A (en) * | 1996-10-21 | 1999-03-09 | Telecommunications Research Laboratories | Optical modulation system |
US6201909B1 (en) * | 1996-10-25 | 2001-03-13 | Arroyo Optics, Inc. | Wavelength selective optical routers |
US5734493A (en) * | 1996-11-01 | 1998-03-31 | Lucent Technologies Inc. | Optical frequency conversion device |
US5745273A (en) * | 1996-11-27 | 1998-04-28 | Lucent Technologies Inc. | Device for single sideband modulation of an optical signal |
US5778118A (en) * | 1996-12-03 | 1998-07-07 | Ciena Corporation | Optical add-drop multiplexers for WDM optical communication systems |
US6195186B1 (en) * | 1996-12-04 | 2001-02-27 | Nec Corporation | Optical WDM ring network |
US6089694A (en) * | 1996-12-17 | 2000-07-18 | Canon Kabushiki Kaisha | Ink jet head and an ink jet apparatus |
US5949560A (en) * | 1997-02-05 | 1999-09-07 | Northern Telecom Limited | Optical transmission system |
US5917638A (en) * | 1997-02-13 | 1999-06-29 | Lucent Technologies, Inc. | Duo-binary signal encoding |
US5938309A (en) * | 1997-03-18 | 1999-08-17 | Ciena Corporation | Bit-rate transparent WDM optical communication system with remodulators |
US6035080A (en) * | 1997-06-20 | 2000-03-07 | Henry; Charles Howard | Reconfigurable add-drop multiplexer for optical communications systems |
US6191854B1 (en) * | 1997-06-23 | 2001-02-20 | Pirelli Cavi E Sistemi S.P.A. | Optical telecommunications system |
US6701085B1 (en) * | 1997-07-22 | 2004-03-02 | Siemens Aktiengesellschaft | Method and apparatus for data transmission in the wavelength-division multiplex method in an optical ring network |
US6222654B1 (en) * | 1997-08-04 | 2001-04-24 | Lucent Technologies, Inc. | Optical node system for a ring architecture and method thereof |
US6084694A (en) * | 1997-08-27 | 2000-07-04 | Nortel Networks Corporation | WDM optical network with passive pass-through at each node |
US6285479B1 (en) * | 1997-10-20 | 2001-09-04 | Fujitsu Limited | Optical cross connect unit, optical add-drop multiplexer, light source unit, and adding unit |
US5870212A (en) * | 1998-01-14 | 1999-02-09 | Mciworldcom, Inc. | Self-healing optical network |
US6195351B1 (en) * | 1998-01-28 | 2001-02-27 | 3Com Corporation | Logical switch set |
US6211980B1 (en) * | 1998-01-30 | 2001-04-03 | Fujitsu Limited | Bi-directional wavelength switching device and wavelength demultiplexing/multiplexing device |
US6351323B1 (en) * | 1998-04-02 | 2002-02-26 | Fujitsu Limited | Optical transmission apparatus, optical transmission system, and optical terminal station |
US6259836B1 (en) * | 1998-05-14 | 2001-07-10 | Telecommunications Research Laboratories | Optical frequency shifter and transmission system |
US6590681B1 (en) * | 1998-06-10 | 2003-07-08 | Telefonaktiebolaget Lm Ericsson | Optical WDM network having an efficient use of wavelengths and a node therefor |
US6580537B1 (en) * | 1998-07-17 | 2003-06-17 | Regents Of The University Of California, The | High-throughput, low-latency next generation internet networks using optical label switching and high-speed optical header generation, detection and reinsertion |
US20020063928A1 (en) * | 1998-08-31 | 2002-05-30 | Per Bang Hansen | Filtering of data-encoded optical signals |
US6891981B2 (en) * | 1998-11-04 | 2005-05-10 | Corvis Corporation | Optical transmission apparatuses, methods, and systems |
US6118566A (en) * | 1998-11-04 | 2000-09-12 | Corvis Corporation | Optical upconverter apparatuses, methods, and systems |
US6404535B1 (en) * | 1998-11-30 | 2002-06-11 | Trw Inc. | Optically implemented wideband complex correlator using a multi-mode imaging device |
US6130766A (en) * | 1999-01-07 | 2000-10-10 | Qtera Corporation | Polarization mode dispersion compensation via an automatic tracking of a principal state of polarization |
US6271946B1 (en) * | 1999-01-25 | 2001-08-07 | Telcordia Technologies, Inc. | Optical layer survivability and security system using optical label switching and high-speed optical header generation and detection |
US20020012148A1 (en) * | 1999-03-12 | 2002-01-31 | Nokia Networks Oy | Dispersion compensation in optical communication network and optical communication network |
US6192173B1 (en) * | 1999-06-02 | 2001-02-20 | Nortel Networks Limited | Flexible WDM network architecture |
US6433904B1 (en) * | 1999-07-27 | 2002-08-13 | Sycamore Networks, Inc. | Method and apparatus for improving transmission performance over wavelength division multiplexed optical communication links using forward error correction coding |
US6369923B1 (en) * | 1999-09-07 | 2002-04-09 | Cinta Corporation | Multiwavelength stabilization with a single reference comb filter in DWDM systems |
US6385204B1 (en) * | 1999-11-22 | 2002-05-07 | Worldcom, Inc. | Network architecture and call processing system |
US20020023170A1 (en) * | 2000-03-02 | 2002-02-21 | Seaman Michael J. | Use of active topology protocols, including the spanning tree, for resilient redundant connection of an edge device |
US20060140643A1 (en) * | 2000-03-07 | 2006-06-29 | Opvista, Inc., A California Corporation | Method and apparatus for interleaved optical single sideband modulation |
US20020080440A1 (en) * | 2000-03-07 | 2002-06-27 | Corning Incorporated | Protection switch in a single two-fiber optical channel shared protection ring |
US6414765B1 (en) * | 2000-03-07 | 2002-07-02 | Corning, Inc. | Protection switch in a two-fiber optical channel shared protection ring |
US7003231B2 (en) * | 2000-03-07 | 2006-02-21 | Opvista, Inc. | Method and apparatus for interleaved optical single sideband modulation |
US20020030877A1 (en) * | 2000-03-07 | 2002-03-14 | Winston Way | Method and apparatus for interleaved optical single sideband modulation |
US6525857B1 (en) * | 2000-03-07 | 2003-02-25 | Opvista, Inc. | Method and apparatus for interleaved optical single sideband modulation |
US7206520B2 (en) * | 2000-03-07 | 2007-04-17 | Opvista Incorporated | Method and apparatus for interleaved optical single sideband modulation |
US20020015553A1 (en) * | 2000-05-18 | 2002-02-07 | Claringburn Harry R. | Radiation power equalizer |
US20030025961A1 (en) * | 2000-05-22 | 2003-02-06 | Winston Way | Broadcast and select all optical network |
US6895184B2 (en) * | 2000-05-22 | 2005-05-17 | Opvista, Inc. | Interconnected broadcast and select optical networks with shared wavelengths |
US20020067523A1 (en) * | 2000-05-22 | 2002-06-06 | Winston Way | Interconnected broadcast and select optical networks with shared wavelengths |
US20020114034A1 (en) * | 2000-05-22 | 2002-08-22 | Winston Way | Split wave method and apparatus for transmitting data in long-haul optical fiber systems |
US6560252B1 (en) * | 2000-07-20 | 2003-05-06 | Jds Uniphase Inc. | Method and device for wavelength locking |
US7068949B2 (en) * | 2000-09-07 | 2006-06-27 | Korea Advanced Institute Of Science & Technology | Multi-wavelength locking method and apparatus for wavelength division multiplexing (WDM) optical communication system |
US20020135838A1 (en) * | 2000-09-11 | 2002-09-26 | Way Winston I. | Dynamic wavelength add/drop multiplexer for UDWDM optical communication system |
US6788899B2 (en) * | 2000-09-11 | 2004-09-07 | Winston I. Way | Dynamic wavelength add/drop multiplexer for UDWDM optical communication system |
US7024112B2 (en) * | 2000-09-11 | 2006-04-04 | Opvista Incorporated | In-band wavelength conversion wavelength buffering and multi-protocol lambda switching |
US20060051092A1 (en) * | 2000-09-11 | 2006-03-09 | Winston Way | In-band wavelength conversion wavelength buffering and multi-protocol lambda switching |
US20050018600A1 (en) * | 2000-10-31 | 2005-01-27 | Massimiliano Tornar | IP multi-homing |
US20030169470A1 (en) * | 2000-11-07 | 2003-09-11 | Oni Systems Corp. | Method and system for bi-directional path switched network |
US6339663B1 (en) * | 2000-12-22 | 2002-01-15 | Seneca Networks, Inc. | Bidirectional WDM optical communication system with bidirectional optical service channels |
US20020126350A1 (en) * | 2001-03-06 | 2002-09-12 | Fujitsu Limited | Optical path cross-connect and optical wavelength multiplexing diversity communication system using the same |
US6556744B1 (en) * | 2001-10-12 | 2003-04-29 | Nortel Networks Limited | Reduction of dispersion effects in optical transmission fibre systems |
US20050158047A1 (en) * | 2003-07-16 | 2005-07-21 | Way Winston I. | Optical ring networks with failure protection mechanisms |
US20050025490A1 (en) * | 2003-07-28 | 2005-02-03 | Fujitsu Network Communications, Inc. | Optical network with sub-band rejection and bypass |
US20050078965A1 (en) * | 2003-10-14 | 2005-04-14 | Hoon Kim | RZ-AMI optical transmitter module |
US20050185969A1 (en) * | 2004-02-19 | 2005-08-25 | Moeller Lothar Benedict E.J. | Method and apparatus for processing optical duobinary signals |
US20050201762A1 (en) * | 2004-03-12 | 2005-09-15 | Moeller Lothar Benedict E.J. | Optical RZ-duobinary transmission system with narrow bandwidth optical filter |
US20070086332A1 (en) * | 2005-10-13 | 2007-04-19 | Way Winston I | Optical ring networks using circulating optical probe in protection switching with automatic reversion |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070206493A1 (en) * | 2002-03-27 | 2007-09-06 | Fujitsu Limited | Flexible Open Ring Optical Network and Method |
US7957644B2 (en) * | 2002-03-27 | 2011-06-07 | Fujitsu Limited | Flexible open ring optical network and method |
US7570886B1 (en) * | 2003-03-14 | 2009-08-04 | Afferton Thomas S | Network with optical bandwidth on demand |
US20090074403A1 (en) * | 2007-09-19 | 2009-03-19 | Industrial Technology Research Institute | Self-healing ring-based passive optical network |
US20100052778A1 (en) * | 2008-08-28 | 2010-03-04 | Dalius Baranauskas | Nth Order Tunable Low-Pass Continuous Time Filter for Fiber Optic Receivers |
US7852152B2 (en) | 2008-08-28 | 2010-12-14 | Menara Networks | Nth order tunable low-pass continuous time filter for fiber optic receivers |
US8509618B2 (en) | 2009-05-06 | 2013-08-13 | Ciena Corporation | Photonic routing systems and methods for loop avoidance |
US8554074B2 (en) | 2009-05-06 | 2013-10-08 | Ciena Corporation | Colorless, directionless, and gridless optical network, node, and method |
US9509428B2 (en) | 2012-02-13 | 2016-11-29 | Ciena Corporation | Photonic routing systems and methods computing loop-free topologies |
US9083484B2 (en) | 2012-02-13 | 2015-07-14 | Ciena Corporation | Software defined networking photonic routing systems and methods |
US9831977B2 (en) | 2012-02-13 | 2017-11-28 | Ciena Corporation | Photonic routing systems and methods computing loop-free topologies |
US9002194B2 (en) | 2012-04-09 | 2015-04-07 | Telefonaktiebolaget L M Ericsson (Publ) | Optical-layer multipath protection for optical network |
US9252912B2 (en) | 2012-04-09 | 2016-02-02 | Telefonaktiebolaget L M Ericsson (Publ) | Method for routing and spectrum assignment |
US8929738B2 (en) | 2012-05-30 | 2015-01-06 | Telefonaktiebolaget L M Ericsson (Publ) | Resilience in an access subnetwork ring |
US20130336653A1 (en) * | 2012-06-13 | 2013-12-19 | Peter Öhlén | Methods and apparatus for a passive access subnetwork |
US9112635B2 (en) * | 2012-06-13 | 2015-08-18 | Telefonaktiebolaget L M Ericsson (Publ) | Methods and apparatus for a passive access subnetwork |
US9451343B2 (en) | 2015-01-30 | 2016-09-20 | Ciena Corporation | Control plane extensions for optical broadcast networks |
US10187152B2 (en) | 2015-01-30 | 2019-01-22 | Ciena Corporation | Control plane extensions for optical broadcast networks |
TWI682627B (en) * | 2017-11-22 | 2020-01-11 | 日商三菱電機股份有限公司 | Data transmission device and data transmission method |
Also Published As
Publication number | Publication date |
---|---|
WO2004064259A3 (en) | 2005-09-15 |
WO2004064259A2 (en) | 2004-07-29 |
US20030180047A1 (en) | 2003-09-25 |
US7499647B2 (en) | 2009-03-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7499647B2 (en) | Fully protected broadcast and select all optical network | |
US8131149B2 (en) | Optical routing device and optical network using same | |
US20030025961A1 (en) | Broadcast and select all optical network | |
US8554074B2 (en) | Colorless, directionless, and gridless optical network, node, and method | |
US6895184B2 (en) | Interconnected broadcast and select optical networks with shared wavelengths | |
US8396361B2 (en) | Method for the protection of a passive optical transmission network as well as a passive optical transmission network with a corresponding protection mechanism | |
US5610744A (en) | Optical communications and interconnection networks having opto-electronic switches and direct optical routers | |
US7313296B2 (en) | Optical fiber protection switch | |
EP1613001A1 (en) | Hybrid optical ring network | |
JP4598528B2 (en) | Optical network and node for optical network | |
KR100334432B1 (en) | Bidirectional add/drop optical amplifier module using one arrayed-waveguide grating multiplexer | |
US6816680B2 (en) | Optical communications network and nodes for forming such a network | |
US6950609B2 (en) | Tunable, multi-port optical add-drop multiplexer | |
US7120360B2 (en) | System and method for protecting traffic in a hubbed optical ring network | |
US7302180B2 (en) | Dual homing for DWDM networks in fiber rings | |
US6304351B1 (en) | Universal branching unit | |
Wagner et al. | Multiwavelength ring networks for switch consolidation and interconnection | |
US20040228631A1 (en) | Optical communication system and method for using same | |
JPH0936834A (en) | Optical branching and inserting circuit | |
JP2005507181A (en) | Method and apparatus for avoiding deadband in optical communication system | |
US6616348B1 (en) | Method and optical communication network for bidirectional protection protocols | |
US20020150328A1 (en) | In-line hub amplifier structure | |
US8116631B2 (en) | Hardened, wavelength enabled optical capacity | |
AU2002100257A4 (en) | In-line hub amplifier structure | |
JP3039435B2 (en) | Optical subscriber transmission system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SILICON VALLEY BANK, CALIFORNIA Free format text: SECURITY AGREEMENT;ASSIGNOR:OPVISTA, INC.;REEL/FRAME:015908/0073 Effective date: 20050331 |
|
AS | Assignment |
Owner name: OPVISTA, INC., CALIFORNIA Free format text: RELEASE;ASSIGNOR:SILICON VALLEY BANK;REEL/FRAME:018923/0201 Effective date: 20070208 |
|
AS | Assignment |
Owner name: COMERICA BANK, CALIFORNIA Free format text: SECURITY AGREEMENT;ASSIGNOR:OPVISTA, INC.;REEL/FRAME:019028/0471 Effective date: 20070208 |
|
AS | Assignment |
Owner name: OPVISTA INCORPORATED, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WAY, WINSTON I.;SHI, CHAO XIANG;SIGNING DATES FROM 20030417 TO 20030520;REEL/FRAME:019355/0557 Owner name: OPVISTA INCORPORATED, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WAY, WINSTON I.;SHI, CHAO XIANG;REEL/FRAME:019355/0557;SIGNING DATES FROM 20030417 TO 20030520 |
|
AS | Assignment |
Owner name: VENTURE LENDING & LEASING IV, INC AND, CALIFORNIA Free format text: SECURITY AGREEMENT;ASSIGNOR:OPVISTA;REEL/FRAME:019910/0285 Effective date: 20070815 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
CC | Certificate of correction | ||
AS | Assignment |
Owner name: VELLO SYSTEMS, INC., CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:VENTURE LENDING & LEASING IV, INC.;VENTURE LENDING & LEASING V, INC.;REEL/FRAME:023768/0657 Effective date: 20090729 |
|
AS | Assignment |
Owner name: OPVISTA, INC., CALIFORNIA Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:COMERICA BANK;REEL/FRAME:026638/0438 Effective date: 20110617 Owner name: VELLO SYSTEMS, INC., CALIFORNIA Free format text: RELEASE BY SECURED PARTY;ASSIGNORS:VENTURE LENDING AND LEASING IV, INC.;VENTURE LENDING & LEASING V, INC.;REEL/FRAME:026638/0818 Effective date: 20110621 |
|
AS | Assignment |
Owner name: OPVISTA, INC., CALIFORNIA Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:COMERICA BANK;REEL/FRAME:026641/0369 Effective date: 20110617 |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
AS | Assignment |
Owner name: VENTURE LENDING & LEASING VI, INC., CALIFORNIA Free format text: SECURITY AGREEMENT;ASSIGNOR:VELLO SYSTEMS, INC.;REEL/FRAME:030498/0219 Effective date: 20130524 Owner name: VENTURE LENDING & LEASING VII, INC., CALIFORNIA Free format text: SECURITY AGREEMENT;ASSIGNOR:VELLO SYSTEMS, INC.;REEL/FRAME:030498/0219 Effective date: 20130524 |
|
AS | Assignment |
Owner name: TREQ LABS, INC., CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TREQ LABS, INC.;VENTURE LENDING & LEASING;REEL/FRAME:034510/0459 Effective date: 20140810 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
AS | Assignment |
Owner name: SNELL HOLDINGS, LLC, MASSACHUSETTS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TREQ LABS, INC.;REEL/FRAME:043522/0776 Effective date: 20170303 |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YR, SMALL ENTITY (ORIGINAL EVENT CODE: M2553); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY Year of fee payment: 12 |