WO2002056077A2 - System and method for collimating and redirecting beams - Google Patents

System and method for collimating and redirecting beams Download PDF

Info

Publication number
WO2002056077A2
WO2002056077A2 PCT/US2001/046191 US0146191W WO02056077A2 WO 2002056077 A2 WO2002056077 A2 WO 2002056077A2 US 0146191 W US0146191 W US 0146191W WO 02056077 A2 WO02056077 A2 WO 02056077A2
Authority
WO
WIPO (PCT)
Prior art keywords
optical
light beam
fiber
aspheric lens
collimating
Prior art date
Application number
PCT/US2001/046191
Other languages
French (fr)
Other versions
WO2002056077A3 (en
Inventor
Dale L Capewell
Sam Beizai
Original Assignee
Intel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Intel Corp filed Critical Intel Corp
Priority to AU2002245067A priority Critical patent/AU2002245067A1/en
Priority to JP2002556273A priority patent/JP2004533004A/en
Priority to IL15568801A priority patent/IL155688A0/en
Priority to CA002427593A priority patent/CA2427593C/en
Priority to EP01993213A priority patent/EP1334390B1/en
Priority to DE60135140T priority patent/DE60135140D1/en
Publication of WO2002056077A2 publication Critical patent/WO2002056077A2/en
Publication of WO2002056077A3 publication Critical patent/WO2002056077A3/en

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24Coupling light guides
    • G02B6/26Optical coupling means
    • G02B6/32Optical coupling means having lens focusing means positioned between opposed fibre ends
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24Coupling light guides
    • G02B6/26Optical coupling means
    • G02B6/28Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29346Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
    • G02B6/29361Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
    • G02B6/29362Serial cascade of filters or filtering operations, e.g. for a large number of channels
    • G02B6/29365Serial cascade of filters or filtering operations, e.g. for a large number of channels in a multireflection configuration, i.e. beam following a zigzag path between filters or filtering operations
    • G02B6/29367Zigzag path within a transparent optical block, e.g. filter deposited on an etalon, glass plate, wedge acting as a stable spacer
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24Coupling light guides
    • G02B6/42Coupling light guides with opto-electronic elements
    • G02B6/4201Packages, e.g. shape, construction, internal or external details
    • G02B6/4246Bidirectionally operating package structures
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24Coupling light guides
    • G02B6/42Coupling light guides with opto-electronic elements
    • G02B6/4201Packages, e.g. shape, construction, internal or external details
    • G02B6/4249Packages, e.g. shape, construction, internal or external details comprising arrays of active devices and fibres

Abstract

A connector to an optical fiber comprises a prism, a ferrule and an aspheric lens. The prism includes a triangular wedge element having a first surface, a second surface and a base. The ferrule guides the optical fiber so as to contact the optical fiber with the first surface of the prism. The aspheric lens is integrated on the second surface, the integrated aspheric lens being positioned so that the prism serves to redirect a light beam at an angle relative to an axis of the optical source input through total int ernal reflection by utilizing the base of the triangle wedge elemnt. The aspheric lens serves to collimate the redirected light beam or focus the light beam before being redirected. This arrangement may, for example, be used within a WDM system to multimplex and de-multiplex several wavelengths of light, using a "zig-zag" optical path configuration and thin film filters to separate the wavelengths.

Description


  



  SYSTEM AND METHOD FOR   COLLIMATING    AND REDIRECTING BEAMS
IN A FIBER OPTIC SYSTEM
BACKGROUND OF THE INVENTION    1.    Field of the Invention
The present invention relates to optical communications, and more particularly, to a system and method for collimating and redirecting beams in a fiber optic system.



   2. Discussion of the Related Art
The integration of aspheric lenses within connectors designed to couple light beams from one optical fiber to another, and manufacturable using injection molding of optically transparent plastic, is well known. These applications generally address the need to maintain alignment between the axis of an optical fiber and a light beam output therefrom. One group of previous known designs describes the placement of a concentric plano-convex lens with the flat side of the lens near or against a fiber core. Another group of known designs is shown in FIG. 1 a. This type utilized the placement of plano-convex lens with the flat side away from a fiber core and an air gap cavity separating the lens and the fiber.

   Shown in FIG. 1 a is a cross-sectional view of a prior optical fiber-connector assembly, comprising the integration of an optical fiber 2 having a fiber core 3 with a fiber connector housing 1. The optical fiber 2 and a collimating lens 7 are positioned so that a cavity 5 is formed between them, with the flat side of the collimating lens 7 being away from the fiber core 3. As an extension to the design shown in FIG. la, the design in
FIG. lb illustrates the use of a wedge 6 to redirect the beam at   45"using    total internal reflection (TIR) after the beam is collimated by the collimating lens 7.



   Similar assemblies designed to couple light directly from a vertical cavity surface emitting laserdiodes (VCSEL) into a multimode fiber and/or couple light from an optical fiber directly onto a photodetector also appear in the prior art. One such assemblies has a design with a concentric TO can ferrule, lens, and fiber ferrule elements. Designs of this nature, applying specifically to coupling between VCSELs and photodiodes mounted inside TO cans and optical fibers, are devised for use in serial data links rather than wavelength division multiplexing (WDM) systems.



   More recent designs involving wavelength division multiplexers (WDM) employing thin film filter (TFF) channel separation and a"zig-zag"configuration may be subdivided into two types of designs. The first type of designs centers around the use of optical waveguides, consisting of regions of high index material (core) surrounded by a lower index material (cladding), to route the light along the"zig-zag"waveguides. The second type of designs involves those designs that depend on collimation and free-space"zig-zag"optical routing. In implementation, the collimation, redirection, and focusing of light relevant to the second type of designs, or the free-space"zig-zag"multiplexer/de-multiplexer designs, differ drastically from the first type of designs, or the waveguide-based solutions.

   Prior art involving TFF-based wavelength division multiplexers (WDM) that employ a free-space"zig-zag"configuration generally applies to fiber-to-fiber applications such as optical switches, branch filters, and add-drop multiplexers.



  Most of these designs have a planar topology that is not well suited for current injection molding technology. Therefore, there is a need for a system and method that utilize free-space"zig-zag" optical routing while being suited for current injection molding technology.



   There is little, if any, prior art that describes a design for a TFF-based optical WDM transceiver that uses injection molding of transparent plastic to construct an integrated optical assembly. One example of a related design was presented by B. Wiedemann at the IEEE 802.3ae
Interim Meeting in 2000. The input collimator of this design is consistent with the air-gap cavity design mentioned earlier with respect to FIGs. la and lb. A serious disadvantage of this design and the designs of FIGs. la and lb is the absence of a ferrule to guide the fiber along the axis of a collimating lens. A small shift in fiber position results in a serious misalignment of the collimated beams.

   If standard injection molding techniques were used to manufacture the design, addition of the ferrule that is necessary to refine the design would be extremely difficult because shaping the lens and ferrule on the same"slide"would generate an undercut condition.



   An additional problem is depicted in FIG. 2, which shows that a collimating element of related design consists of a lens surface positioned on a tilted base of refractive material. The diagram suggests that, by design, the chief optical ray of a beam 8 from a point source 4 strikes the surface of a lens 7 near its center and refracts into the refractive material 9 at an angle equal to the tilt angle of the base on which the lens surface is mounted. The tilt angle of the base is used to redirect the chief ray of the beam 8 to the desired angle, while the curvature of the lens 7 is used to collimate the beam 8. Because the chief ray is deliberately designed to penetrate the surface of the lens 7 off its axis of symmetry, the quality of beam collimation is sacrificed.

   It is impossible to eliminate aberration in the beam 8 even if aspheric terms are added to the sag equation defining the lens 7. Aberration is especially great for sources of large numerical aperture, for large tilt angles, and for sources displaced slightly from the optimal position. Therefore, there is a need for a system and method that collimates and redirects beams in a fiber optic system in a more efficient manner. 



  BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention:
Figure la illustrates a cross-sectional view of a prior optical fiber-connector assembly ;
Figurelb illustrates a cross-sectional view of another prior optical fiber-connector assembly;
Figure 2 illustrates a prior design intended to collimate light from a point source, such as an optical fiber;
Figure 3a shows an optical subassembly for redirecting and collimating output from an optical fiber according to an embodiment of the present invention ;
Figure 3b shows an optical subassembly for redirecting and coupling a collimated beam into an optical fiber according to an embodiment of the present invention;

  
Figure 4a shows an optical subassembly for collimating and redirecting an output beam from a surface emitting laser according to an embodiment of the present invention;
Figure 4b shows an optical subassembly for redirecting and coupling a collimated beam into a photodetector according to an embodiment of the present invention ;
Figures 5a and 5b illustrate schematically designs for a four-channel wavelength division multiplexer/de-multiplexer with a fiber optic input/output according to an embodiment of the present invention;
Figure 6 shows a case where the magnification of an optical system is not equal to one according to an embodiment of the present invention;

   
Figures 7a and 7b show a four channel   CWDM    transceiver integrated with a connector housing suitable to receive a fiber optic connector according to an embodiment of the present invention;
Figure 8 shows a complete transceiver module in which embodiments of the present invention may function; and
Figure 9 illustrates an optical subassembly for redirecting and collimating output from an edge-emitting laser according to an embodiment of the present invention.



  DETAILED DESCRIPTION
Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. While the present invention will be described in conjunction with the preferred embodiments, it will be understood that they are not intended to limit the invention to these embodiments. On the contrary, the present invention is intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the invention as defined by the appended claims. Moreover, in the following detailed description of the present invention, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the invention may be practiced without these specific details.

   In other instances, well-known methods, procedures, and components have not been described in detail as not to unnecessarily obscure aspects of the present invention.



   Embodiments of the present invention are directed to addressing the aforementioned drawbacks associated with collimating and redirecting beams in a fiber optic system. An embodiment of the present invention is directed to a fiber collimator for redirecting and collimating a light beam from an optical source input. The fiber collimator comprises a prism with a triangular wedge element having a first surface, a second surface and a base, a ferrule to guide the optical source input so as to contact the optical source input with the first surface of the prism, and an aspheric lens integrated on the second surface. The integrated aspheric lens is positioned so that a chief ray of the light beam passes directly through the axis of the aspheric lens.

   The prism serves to redirect the beam at an angle relative to an axis of the optical source input, with the base of the triangle wedge element redirecting the light beam by total internal reflection (TIR). The aspheric lens then serves to collimate the redirected light beam.



   In one embodiment, the present invention is further directed to a fiber coupler for redirecting and coupling a light beam into an optical fiber core of an optical fiber. The fiber coupler comprises a prism, an aspheric lens and a ferrule similar to those in the fiber collimator.



  The aspheric lens receives a light beam, and is positioned so that the light beam is focused after passing through the aspheric lens, creating a focal spot image. The base of the triangle wedge element of the prism serves to redirect the focused light beam by total internal reflection (TIR) at an angle relative to an axis of the optical fiber, the focused light beam becoming coupled into the optical fiber core. The ferrule guides the optical fiber so as to contact the optical fiber core with the first surface of the prism at or near the location of the focal spot image.



   Embodiments of the invention are also directed to a collimating optical subassembly and a focusing optical subassembly. Both are fabricated of optically transparent material and integrated as a single part using injection-molding techniques. The former is for collimating and redirecting a divergent light beam from a point source; it comprises an aspheric lens, a spacer element and a wedge element. The aspheric lens receives and collimates a divergent light beam, creating a collimated light beam. The spacer element is positioned above the aspheric lens, and the wedge element is positioned above the spacer element. The wedge element refracts the collimated light beam into air at an angle relative to the axis of the aspheric lens consistent with Snell's law. On the other hand, the focusing optical subassembly is for redirecting and focusing a collimated light beam.

   The focusing optical subassembly comprises a wedge element, a spacer element and an aspheric lens. The wedge element receives a collimated light beam from outside. The spacer element is positioned below the wedge element, and the aspheric lens is positioned below the spacer element. The collimated light beam received by the wedge element travels in air at an angle relative to an axis of the aspheric lens. The wedge element redirects a chief ray of the collimated beam through the spacer element along the axis of the aspheric lens. The aspheric lens focuses the collimated light beam to a point along its axis.



   Another embodiment of the present invention is directed to a transceiver comprising alignment ferrules for optical fibers, a fiber connector housing, and a ledge to precisely control the planar orientation of a printed circuit board. Using a combination of aspheric lenses and prisms, and in particular, the fiber coupler, the fiber collimator, the collimating optical subassembly and the focusing optical subassembly, the transceiver is able to collimate and route light from two or more VCSELs or edge-emitting lasers through a"zig-zag"configuration as well as to redirect and focus the combined light onto the core of a single optical fiber.

   Moreover, collimating and routing light from a single optical fiber, having multiple wavelength components, through a freespace"zig-zag"configuration and redirecting and focusing the light at each individual wavelength onto a different photodetector are achieved.



   The WDM transceiver module described herein is paraxial by design, using aspheric lenses to compensate for spherical aberration, and optically optimized for alignment tolerances of the laser sources and photodetectors. This is done by adjusting the optical focal lengths of the lenses to magnify or de-magnify the image of the laser source (transmitter) or fiber core (receiver) on the respective image plane. Appropriate magnification may be used to increase the tolerance of the optical system to misalignment of the laser sources and/or photodetectors, and/or to match the numerical aperture of the laser source to that of the optical fiber into which the light is coupled.

   This optimization maximizes the overall alignment tolerance of the optical subassembly with the substrate on which the lasers and photodetectors are attached, and/or the coupling efficiency of the lasers to the optical fiber. This optimization technique, the specific layout of fiber ferrules, prisms and lenses integrated as one part with the ledge to aid in positioning on a printed circuit board are enabling features for mass production of low-cost WDM transceivers using current state-of-the-art optical-quality injection molding techniques.



   According to a further embodiment of the present invention, a mold assembly for fabricating an integrated optical assembly as a single injection-molded part is provided. The mold assembly comprises first and second mold halves and a single slider. The first and second mold halves are arranged to mate with each other, forming a draw direction oriented parallel to axes of aspheric lenses of a focusing optical subassembly of an optical de-multiplexer and a collimating optical subassembly of an optical multiplexer. The single slider is used to form ferrules for a fiber collimator of the optical de-multiplexer and a fiber coupler of the optical multiplexer as well as to form the connector housing. The first mold half is used to shape wedges of the collimating and focusing optical subassemblies and to shape aspheric lenses of the fiber collimator and the fiber coupler.

   The second mold half is used to shape total internal reflection surfaces of the fiber collimator and the fiber coupler and to shape the aspheric lenses of the collimating and focusing subassemblies.



   Reference in the specification to"one embodiment"or"an embodiment"of the present invention means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrase"in one embodiment"appearing in various places throughout the specification are not necessarily all referring to the same embodiment. 



   Embodiments of the present invention are directed to systems and methods for collimating and redirecting beams in an optical system. In general, the present invention is applicable whenever light from a point   source--e. g.,    laser, optical fiber--needs to be collimated, directed offaxis, and focused to form an image of the source with good quality and carefully controlled position, size and numerical aperture. The present invention is also applicable when the alignment tolerance of the source and the image relative to the optical system needs to be optimized.

   For example, embodiments of the present invention are utilized in a wavelength division multiplexing (WDM) system to multiplex and de-multiplex several wavelengths/channels of light, wherein WDM transceiver modules are optically optimized for the alignment tolerance of the laser sources and photodetectors. The optimization maximizes the overall alignment tolerance of the optical subassembly with the substrate on which the lasers and photodetectors are attached.



  This technique, along with the specific layout of prisms and lenses, are enabling features for mass production of optical subassemblies and free-space coupled WDM transceiver modules.



   With reference now to FIG.   3a,    an optical subassembly 100a according to an embodiment of the present invention is provided. In the embodiment, the optical subassembly   100a    is a fiber collimator that is designed to redirect and collimate an output of a divergent light beam 20 from an optical fiber 10, creating a collimated output 25. The optical subassembly 100a comprises a prism 30, an aspheric lens 40 and an alignment ferrule 50. The optical fiber 10 directs the divergent light beam 20 into the optical subassembly. Prior to collimation, the prism 30, having an index of refraction n, is used to redirect the divergent light beam 20 at a specific angle   ()    relative to the axis normal to the incoming optical axis using total internal reflection (TIR).

   TIR results as divergent light beam 20 hits a TIR surface 80 of the prism 30. In one implementation, the angle       must satisfy the following condition:
2arcsin   (1/n)-TC/2     <    f     <    n/2    
The prism 30 may, for example, be made of polycarbonate because of its highly transparent characteristic, with the index of refraction n being approximately 1.57. If this case, the angle must be greater than-10.87 degrees.



   As shown in FIG. 3a, the prism 30 has a spacer element 60, having a length D. The length
D of the spacer is defined in such a way that the folded optical path of light passing through the aspheric lens 40 places the focus of the lens 40 at or near the input wall of the prism 30. The spacer element 60 is an important feature to the design of the optical subassembly 100a, enabling convenient tuning of the focal length and numerical aperture in this portion of an optical system while maintaining a well-defined focal plane, which is important for alignment purposes.



  However, it should be apparent to one in the art that depending on the specific arrangement of the optical fiber 10 and the structures of optical subassemblies in accordance with other embodiments of the present invention, the spacer element 60 may not be needed.



   According to an embodiment of the present invention, the alignment ferrule 50 is attached to the prism 30 to ensure that the optical fiber 10 is optimally aligned to the prism 30. As shown in FIG.   3a,    this alignment is defined by having the chief ray from the fiber propagate directly along the axis of symmetry of the lens 40. In one embodiment, this is ensured by the geometry of the prism 30, designed such that an isosceles triangle ("abc") wedge is provided. Here, the isosceles triangle abc is symmetric about the vertex"c", i. e., the length of side ca is equal to the length of side cb. The isosceles triangle abc wedge is provided to ensure that the chief ray enters and exits the optical subassembly 100a at a normal incidence.

   This preserves the independence of the angles of the isosceles triangle abc on the choice of refractive material used to construct the optical subassembly. Used in conjunction with the spacer element 60, the isosceles triangle abc wedge can be kept at a constant dimension, while the spacer element 60 provides a means for adjusting the optical path length from the optical fiber 10 to the aspheric lens 40. This allows the focal length of the lens 40, and thereby the radius of the collimated beam 25, to be adjusted while keeping the dimensions of the isosceles triangle abc wedge constant. In other embodiments, other types of triangular shaped wedge may be used.



   In one implementation, the optical subassembly   100a,    consisting of the alignment ferrule 50, the prism 30 and the aspheric lens 40, is manufactured as one part, thereby minimizing alignment inaccuracy. The prism 30, the aspheric lens 40 and the alignment ferrule 50 may be made by a standard injection molding process using, for example, polycarbonate, polyolefin, or polyethylimide. On one hand, polycarbonate is often used because of its high transparency. On the other hand, polyethylimide is often used because of its high temperature operating characteristic and low coefficient of thermal expansion (CTE).



   The optical subassembly described above can naturally be operated in reverse to redirect and focus a collimated beam into an optical fiber. FIG. 3b illustrates an optical subassembly 100b for redirecting and coupling collimated beam into an optical fiber according to an embodiment of the present invention. In the embodiment, the optical subassembly 100b is a fiber coupler created for redirecting and focusing a collimated beam 25'whose chief ray enters along the axis of symmetry of an aspheric lens 40. The focal length of the lens 40 is designed to produce an image spot with a numerical aperture matching the numerical aperture of an optical fiber 10. The prism 30 is utilized to redirect a convergent light beam 20', which is formed from the collimated beam 25'passing through the aspheric lens 40 and redirected by a TIR surface 80.

   An alignment ferrule 50 and a spacer element 60 are used to precisely position the optical fiber 10 at the focus of the optical subassembly   100b.   



   FIG. 4a illustrates an optical subassembly 200a for collimating and redirecting an output beam from a surface emitting laser according to an embodiment of the present invention. The optical subassembly 200a comprises a prism 230, an aspheric lens 240, and a spacer 260 positioned in between the prism 230 and the aspheric lens 240. In one embodiment, the optical subassembly 200a is used for collimating and redirecting an output beam from a vertical cavity surface-emitting laser (VCSEL) 250. Examples of the laser sources of interest for this application includes, but are not limited to, VCSELs emitting in the 850 nm band, VCSELs emitting in the 980 nm band, and VCSELs currently in development at the 1300 nm band.

   In contrast to the prior art design shown in FIG. 2, a non-tilt aspheric lens 240 is used to collimate the output beam from the VCSEL 250, while a flat, tilted surface 235 of the prism 230 is used to redirect the collimated beam to a desired angle. This effectively uncouples the two separate tasks of redirection and collimating in the present design, making the design"paraxial,"i. e., the beam falls on the refracting surface close to and almost parallel to the axis. The absence of tilt in the aspheric lens 240 and the addition of a second, flat surface 235 to perform the function of redirecting the beam are key differences between the present invention and prior designs.

   This significantly improves the collimated beam quality, enabling the output beam to remain well collimated even for a source having a large divergence angle and/or significant offsets in the position of the source. The result is a greatly improved tolerance to misalignment.



   Like the optical subassembly 100a described in FIG.   3a,    the optical subassembly 200a shown in FIG. 4a, can be used in reverse to redirect and focus a collimated beam. FIG. 4b illustrates an example of such an optical subassembly 200b. A collimated beam is incident to a flat, tilted surface 235 of the prism 230 at a specific angle. The optical subassembly 200b, being paraxial in nature, makes use of the flat, tilted surface 235 to redirect the collimated beam and an aspheric lens 240 to focus the beam. This results in a diffraction-limited image being focused onto a photodetector 210. Since photodetectors utilized for high-speed optical modulation typically have small active area, efforts to minimize the size of the image are important to maximize both the optical energy detected and the tolerance to detector misalignment.

   With the paraxial optical subassembly 200b, the size of the image is minimized at the photodetector 210.



  Typically, a spacer 260 is provided between the aspheric lens 240 and the prism 230. One of the functions of the spacer 260 is to allow molten optically transparent material to easily flow through a mold for fabricating the optical subassembly 200a and/or the optical subassembly 200b during injection molding manufacturing processes.



   FIGs. 5a and FIG. 5b illustrate schematically designs for a four-channel wavelength division multiplexer/de-multiplexer with a fiber optic input/out according to embodiments of the present invention. The four-channel wavelength division multiplexer/de-multiplexer uses thin film filters (TFFs) in a"zig-zag"scheme to perform channel separation. FIG. 5a depicts an optical demultiplexer, or a receiver, that consists an optical subassembly 100a as depicted in FIG.



  3a, a glass plate 300, a set of TFFs 270a-270d and a set of focusing optical subassemblies 200b as depicted FIG. 4b. With the prism 30 and aspheric lens 40, the optical subassembly 100a, or the fiber collimator, redirects and collimates a divergent beam from an optical fiber 10 at a specific angle relative to normal to the input axis of the optical fiber 10. In the embodiment, the light beam contains multiple wavelengths, and four focusing optical subassemblies 200b and four TTFs 270a-270d are provided. From the optical subassembly   100a,    the collimated, multi-chromatic beam refracts into the glass plate 300, which has a high refractive (HR) coated surface   310    for reflecting the beam.

   The HR coated surface 310 is coated with a broadband high reflective (HR) coating, and it is coated on the side opposite to the side from with the beam enters. The bandwidth of the HR coating includes all the wavelengths to be de-multiplexed. The input angle of the collimated beam is controlled to allow the collimated beam to reflect back-and-forth within the glass plate 300 with a specific spacing d. This is determined by the angle of a TIR surface of the prism 30, the refractive index of the glass plate 300, the refractive index of the TFF substrates 270a-270d, and the thickness of both the glass plate 300 and the TFF substrates 270a-270d. 



   In the embodiment, each of four TFFs 270a-270d is highly reflective over the same bandwidth as the above-described HR coating surface   310    on the glass plate 300, except within a narrow passband centered at one of the four wavelengths that comprise the input beam. The passband of the TFFs 270a-270d should be wide enough to allow for laser wavelength drift with temperature, manufacturing error, etc. The center wavelengths should be spaced sufficiently far apart, so that negligible overlap exists among the passbands of the TFFs 270a-270d. The width of each of the TFFs 270a-270d used in the embodiment of the present invention shown in FIGs. 5a and 5b may, for example, be 10-15 nm and the spacing may, for example, be 20-25 nm.

   Further, the design of the multi-layer dielectric structure, used to construct passbands of the TFFs 270a270d employed in the embodiment, is optimized for the specific angle of incidence expected for the"zig-zag"scheme. This optimization minimizes any variation in reflection and transmission due to the polarization state of the incident light.



   In one embodiment, the TFFs 270a-270d are course wavelength division multiplexing   (CWDM)    filters, or so-called wide wavelength division multiplexing   (WWDM)    filters, that are used in a   CWDM    system. In other embodiments, the TFFs 270a-270d are dense wavelength division multiplexing   (DWDM)    filters, that are used in a   DWDM    system, where light at different wavelengths is closely packed. In one implementation, the substrate of each TFFs 270a-270d is composed of the same refractive material as the glass plate 300. In other implementations, the
TFFs 270a-270d and the glass plate 300 have different refractive indexes.

   In FIGs. 5a and   5b,    each of the TFFs 270a-270d is positioned such that its bandpass coating faces away from the glass plate 300. However, the bandpass coating may be placed in contact with the glass plate 300 in other embodiments. In one implementation, an index matching epoxy may be used to attach the set of TFF substrates 270a-270d to the glass plate 300. 



   In operation, a wavelength component of the collimated beam is shown to propagate backand-forth within the glass plate 300 of the optical demultiplexer of FIG.   5a.    The propagation ends when the collimated beam is incident onto a particular TFF with a bandpass coating that allows the particular wavelength component to pass. As illustrated in FIG.   5a,    the TTF 270a is the particular TTF for a particular wavelength component. After passing through TFF 270a, the wavelength component passes through a focusing optical subassembly and is focused onto a photodetector 210. The photodetector 210 may, for example, be a photodiode. Although not shown for sack of clarity, each of the other wavelength components (not shown) in the input beam passes through a different TFF and is directed and focused onto a different photodetector (not shown).

   Preferably, a photodetector is positioned beneath each aspheric lens 240 to detect the wavelength component passing therethrough.



   FIG. 5b depicts a four-channel wavelength optical multiplexer according to an embodiment of the present invention. Light from any one   of VCSELs    250 is first collimated, then redirected into a"zig-zag"optical path, and finally coupled into an optical fiber 10. The VCSELs 250 are mounted on a line below the multiplexer. Use of several VCSELs and TFFs having nonoverlapping passbands, each centered at the emitting wavelength of its corresponding VCSEL, enables the design of a wavelength division optical multiplexer (WDM). One VCSEL is positioned beneath each aspheric lens to introduce its light beam into the WDM system. For sack of clarity, only one light beam and one VCSEL are shown. The light beam emitted from a
VCSEL 250 passes through its corresponding optical assemblies 200a, like the one described in
FIG. 4a.

   The light is collimated by the aspheric lens 240 and redirected by the prism 230 into the glass plate 300. Upon entering the glass plate 300, the light beam passes through the TFF 270a.



  Light beams from other VCSELs enter the glass plate 300 in a similar fashion. Since the TFFs 270a-270d have non-overlapping passbands, different wavelength components are extracted from the light beams. Inside the glass plate 300, light with different wavelength components travels in a"zig-zag"optical path while being reflected by the HR coating   310    and the TFFs 270a-270d.



  After leaving the glass plate 300, the light with different wavelength components are coupled into an optical fiber 10 by an optical subassembly 100b, like the one described in FIG. 3b.



   Of importance to the transceiver design depicted in FIG. 5a and FIG. 5b is the alignment of the VCSELs 250 and photodetector apertures 210 to their corresponding aspheric lenses 240.



  Misalignment often results because of the manufacturing tolerances of optical subassemblies and/or glass plates, thermal expansion, placement accuracy of a die bonder used to position the
VCSEL 250 and photodetector 240, etc. Efforts to maximize the amount of light coupled into the optical fiber 10 despite any misalignment of the VCSEL 250, and/or to maximize the amount of light incident onto the photodetector 210 despite any misalignment of the photodetector 210, are necessary to make the transceiver design more readily manufactured. In the present invention, several design features are specifically utilized for this purpose.

   For example, to ensure an optimally collimated beam, despite small variation in the position of the VCSEL 250 in FIG. 4a, the aperture of the aspheric lens 240 is made larger than the waist of the output beam, that is    R  >  f2 tan (sin-' (NAln)),    where R is the aperture of the aspheric lens 240   and2 ils    the focal length of the aspheric lens 240.



  The lens parameters for the aspheric lens 40 in FIG. 3b are optimized by assuming a source with a numerical aperture (NA) that completely fills the full aperture of the lens, given by the following expression:    NA = n sin (tan-' (Rlfj)).   



  This ensures that the image of the source remains undistorted even if the source is displaced from its optimal position. When the VCSEL 250 is displaced, the undistorted, diffraction-limited image, whose size is proportional to the size of the source, simply translates in the image plane an amount proportional to the displacement of the source. The constant of proportionality for both size and displacement is the magnification of the entire optical system, given by the ratio of the focal lengthy of the optical subassembly 100b and the focal lengthy of the optical subassembly 200a. Similar arrangements and analysis apply to optical subassemblies depicted in FIGs. 4b and 3a.

   If the focal length of the aspheric lens 40 and the aspheric lens 240 are equal, for example, the laser source from the VCSEL 250 is imaged at actual size onto the fiber core of the transmitter fiber 10, and the fiber core of the receiver is imaged at actual size onto the photodetector 210.



  The image in each case moves one micron for every micron of source displacement.



   FIG. 6 shows a general case, where the magnification of the optical system is not equal to one, i. e., the laser source or the fiber core is not imaged at actual size. If the VCSEL 250, or the laser source, is displaced from its ideal position by a distance Source, then the image   510    of the
VCSEL aperture on the fiber core 500 moves a distance   Xsourcegl/2    Approximately half the power (i. e. 3dB) is lost in the transmitter when Xsource f1/f2 = Dfiber/2, where Dfiber is the diameter of the optical fiber.

   The alignment tolerance for placing the laser source is, therefore,   Xsource 3dB #      Df, b,, f2l2f,.    It would be desirable to minimize the magnification in order to maximize the alignment tolerance; however, the choice of magnification also impacts the numerical aperture (NA) of the source image projected onto the fiber core. It is undesirable to project an image to the fiber core with a NA larger than that of the fiber because light will be lost. The NA,   NAsource,    of the source image and the NA,   Fiber,    of the image projected onto the fiber core are related through the following expression:
NAfiber = NAsource f2/f1
Because of this, the minimum desirable magnification is given by    fiff2 = NAsourceINAfiber.    



  The alignment tolerance of the source in this case becomes   Xsource      3dB Dfiber NAfiber2NAsource.    In one implementation of the present invention, this constraint is used when designing the prescription for the lens 40 in the optical subassembly 100b used to couple collimated light into the optical fiber 10 and the lens 240 in the optical subassembly 200a used to collimate the light from the VCSEL 250. For example, a typical 50 micron diameter multimode fiber having a NA near 0.2, and a typical VCSEL, having a NA near 0.26, suggests a magnification near 1.3. This translates into an alignment tolerance   of +    20 microns for the VCSEL 250.



   FIGs. 7a and 7b show perspective views of a four-wavelength   CWDM    transceiver integrated with a housing suitable for receiving a duplex fiber optic connector according to an embodiment of the present invention. FIG. 7a is a cross-sectional view of the four-wavelength   CWDM    transceiver with the housing, and FIG. 7b is a perspective view of the four-wavelength   CWDM    transceiver with the housing looking from the bottom of the transceiver. The assembly/device shown in FIGs. 7a and 7b consists of at least one of the optical subassemblies 200a, 200b described in FIG. 5a and FIG.   5b,    respectively, integrated with a connector housing 400 suitable to receive a duplex fiber connector or any other fiber optic connector. Shown in FIG.



  7a are slots used for accurately placing TTFs 270 over the optical subassemblies 200a or 200b.



  These slots are created at a distance equal to or substantially equal to the TFF substrate thickness.



  The square cavity directly above the   prism/lens    components, and above the TFFs 270, is where the HR coated glass plate 300 is positioned. In a preferred implementation, the assembly depicted in FIG. 7a and FIG. 7b is manufactured as a single part, using plastic (e. g. polycarbonate or polyethylimide) injection-molding techniques. In these techniques, plates containing cavities where plastic will ultimately reside are brought together along a"direction of draw,"which is designated by reference numeral 600. This forms a closed mold. One or more"sliders," designated by reference numeral 610, manufactured with surface shapes relevant to the plastic part of interest, may be inserted into the closed mold along axes other than that of the draw direction 600.

   Mold inserts for optical surfaces may be manufactured separately using high precision, diamond-tip machining techniques and inset into the rest of the mold. Once the complete volume is defined, molten plastic is injected through one or more gates, with the pressure of the plastic displacing the air in the cavity out through one or more vents. Once the plastic part cools, the sliders 610 retract and the plates separate. The part is then ejected and the cycle repeats.



   While the design rules for manufacturing molds suitable for plastic injection molding are well known, special care is required to design a single-piece WDM transceiver mold with the optical functionality described in FIG. 5a and/or FIG.   5b.    Shown in FIGs. 7a and 7b, the lens and prism surfaces in the preferred implementation of the present invention are easily cast using only the two mold faces that meet along the direction of draw 600. A single"slider"surface is used to cast the inside of the connector housing, including the alignment ferrule 50 used to guide the optical fiber. Diamond-turned inserts are, for example, used to define all optical quality surfaces including the lenses 40, prisms 30, and TIR surfaces 80. In addition, a plastic spacer 260 is, illustratively, placed between the redirecting prisms 230 and the aspheric lenses 240.

   The spacer 260 is included to provide, as one of its functions, an adequate flow channel for the molten plastic.



   FIG. 8 shows a complete transceiver module according to an embodiment of the present invention. The complete transceiver module includes a dual fiber optic connector 710, an injection-molded optical assembly 720, a printed circuit board (PCB) 730, and a metal shield for minimizing electromagnetic interference (not shown). Optical fibers 10a, 10b are connected to the dual fiber connector 710. One optical fiber in the dual connector 710 is for the receiver, and the other one is for the transmitter. As described, the optical assembly 720 is preferably a one piece injection-molded optical subassembly with a connector housing 400. The dual fiber connector 710 slides into the connector housing 400. The PCB 730 is aligned with the one-piece injection-molded optical subassembly in the optical assembly 720.

   On the PCB 730, there are laser sources, photodetectors, chips for processing electrical signals, other circuitry, etc. To aid the alignment, a ledge structure is provided in a plane parallel to the plane tangential to, and passing through, the apex of the aspheric lenses of the collimating and optical subassemblies in the optical assembly 720. The ledge structure allows the PCB 730 to be inserted and to be parallel to the aspheric lenses within a few microns of tolerance.



   While the preferred implementation of the present invention utilizes a VCSEL as the optical source for each wavelength in the WDM transmitter, an edge-emitting laser (EEL) may alternatively be used. FIG. 9 illustrates an optical subassembly, and more particularly, a collimating element useful for redirecting and collimating output from an   EEL 100    according to an embodiment of the present invention. Similar to the optical subassembly 100a depicted in FIG.



  3a, the collimating element comprises an aspheric lens 140 and a prism 130 with a spacer 160.



  The divergent light beam 120 from the EEL 100 is redirected at a specific angle,   ,    relative to normal to the optical axis of the   EEL 100    by TIR using a prism 130. The divergent beam 120 is then collimated using an aspheric lens 140.



   The light beam 120 from the   EEL 100    diverges faster along one axis than along the other.



  This is true for both Fabry-Perot (FP) type EELs and distributed feedback (DFB) type EELs. As a result, light from an EEL collimated by a simple lens produces an elliptical beam profile. In one implementation of the present invention, as shown in FIG. 9, a TIR surface 180 may be shaped so that it acts as a cylindrical lens. The TIR surface 180 can speed up the divergence of a slower axis and/or slow down the divergence of a faster axis. In the embodiment, the aspheric lens 140 may be toric, having a different focal length along each axis. The resultant beam, defined by the NA of the EEL 100, the TIR surface 180 and the aspheric lens 140 along each axis, may be designed to collimate both axes simultaneously while producing a beam of arbitrary ellipticity.

   In this case, the NA of the TIR surface 180 is flat along one axis and defined by a specific sag equation along the other, and the NA of the aspheric lens 140 is defined by a different sag equation along each axis. In other embodiments, the desired beam profile is circular or nearly circular.



   An optical multiplexer based on optical subassemblies described in FIG.   3a    and FIG 9 may also be constructed, enabling the use of EELs as source lasers rather than VCSELs. The design is similar to that shown in FIG.   5b.    In an alternative embodiment, the angle of the output beam in the"xy"plane defined in FIG. 9 may be controlled by rotating the TIR surface 180 about the"z"axis to any angle desired. When a rotation with       =   0  is    implemented, the EELs emit in a direction orthogonal to the direction of the"zig-zag"scheme.



   While the foregoing description refers to particular embodiments of the present invention, it will be understood that the particular embodiments have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teachings and may be made without departing from the spirit thereof. The accompanying claims are intended to cover such modifications as would fall within the true scope and spirit of the present invention.

   The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, rather than the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

WHAT IS CLAIMED IS: 1. A connector to an optical fiber, comprising: a prism that includes a triangular wedge element having a first surface, a second surface and a base; a ferrule to guide the optical fiber so as to contact the optical fiber with the first surface of the prism, the first surface being substantially perpendicular to the optical fiber; and an aspheric lens integrated on the second surface, the integrated aspheric lens being positioned so that the prism serves to redirect a light beam at an angle relative to an axis of the optical source input through total internal reflection by utilizing the base of the triangle wedge element, the aspheric lens serving to at least one of collimate the redirected light beam and focus the light beam before being redirected.
2. The connector of claim 1, wherein the connector is a fiber collimator.
3. The connector of claim 1, wherein the connector is a fiber coupler.
4. A fiber collimator, comprising: a prism that includes a triangular wedge element having a first surface, a second surface and a base; a ferrule to guide an optical source input to the fiber collimator so as to contact the optical source input with the first surface of the prism, the first surface being substantially perpendicular to the optical source input; and an aspheric lens integrated on the second surface, the integrated aspheric lens being positioned so that the prism serves to redirect a light beam at an angle relative to an axis of the optical source input, and the aspheric lens serves to collimate the redirected light beam, the base of the triangle wedge element redirecting the light beam by total internal reflection (TIR).
5. The fiber collimator of claim 4, wherein the triangular wedge element is an isosceles triangle wedge, the length of the first surface being equal to the length of the second surface.
6. The fiber collimator of claim 4, wherein the prism further comprises a spacer element, the spacer element providing a mechanism to adjust an optical path length from the aspheric lens to the optical source input, allowing the focal length of the aspheric lens, and thereby the radius of the collimated light beam, to be adjusted while keeping the dimensions of the triangle wedge element constant.
7. The fiber collimator of claim 4, wherein diamond-turned inserts are utilized to define optical quality surfaces, including those for at least one of the prism, the aspheric lens and the TIR surface.
8. A fiber coupler, comprising: a prism that includes a triangular wedge element having a first surface, a second surface and a base ; an aspheric lens integrated on the second surface, the integrated aspheric lens receiving a light beam, the aspheric lens being positioned so that the light beam is focused after passing through the aspheric lens, creating a focal spot image; and a ferrule to guide an optical fiber of the fiber coupler so as to contact an optical fiber core of the optical fiber with the first surface of the prism at or near the location of the focal spot image, wherein the base of the triangle wedge element serves to redirect the focused light beam by total internal reflection (TIR) at an angle relative to an axis of the optical fiber, the focused light beam being directed into the optical fiber core.
9. The fiber coupler of claim 8, wherein the triangular wedge element is an isosceles triangle wedge, the length of the first surface being equal to the length of the second surface.
10. The fiber coupler of claim 8, wherein the prism further comprises a spacer element, the spacer element providing a mechanism to adjust an optical path length from the aspheric lens to the optical fiber, allowing the focal length of the aspheric lens, and thereby the numerical aperture of the light delivered to the optical fiber, to be adjusted while keeping the dimensions of the triangle wedge element constant.
11. The fiber coupler of claim 8, wherein the light beam received by the aspheric lens is an elliptically shaped, collimated light beam and the focal spot imaged onto the fiber core is circular or substantially circular, the base of the triangle wedge element having curvature to enable this TIR surface to act as a cylindrical mirror, the aspheric lens being toric with its principle axes aligned with those of the cylindrically curved TIR surface, the combination of the cylindrically curved TIR surface and the toric aspheric lens serving to collimate and correct for spherical aberrations and rendering the focal spot imaged onto the fiber core circular or substantially circular.
12. The fiber coupler of claim 8 wherein the lens parameters for the aspheric lens is optimized by utilizing a source with a numerical aperture that completely fills the full aperture of the lens.
13. A collimating element, comprising: a prism that includes a triangular wedge element having a first surface, a second surface and a base, the base of the triangle wedge element having curvature to enable it to act as a cylindrical mirror to redirect the light beam by total internal reflection;
and an aspheric lens integrated on the second surface, the aspheric lens being toric with principle axes aligned with those of the cylindrically curved base of the triangle wedge element, the integrated aspheric lens being positioned so that a chief ray of the light beam passes directly through the axis of the aspheric lens, wherein the light beam from an optical source input is an elliptically shaped beam, the elliptically shaped beam being redirected at an angle relative to an axis of the optical source input by the cylindrically curved base, the redirected light beam being collimated by the aspheric lens, the collimated light beam being a circularly or substantially circularly shaped beam, wherein the aspheric lens serves to collimate the redirected light beam, the base of the triangle wedge element redirecting the light beam by total internal reflection.
14. The collimating element of claim 13, wherein the optical source input is an edge emitting laser.
15. A collimating optical subassembly for collimating and redirecting a divergent light beam from a point source, comprising: an aspheric lens that receives and collimates the divergent light beam, creating a collimated light beam ; a spacer element above the aspheric lens; and a wedge element that refracts the collimated light beam into air at an angle relative to the axis of the aspheric lens consistent with Snell's law, the wedge element being positioned above the spacer element, wherein the collimating optical subassembly is fabricated of optically transparent material and integrated as a single part using injection-molding techniques.
16. The collimating optical subassembly of claim 15, wherein the point source is a vertical cavity surface emitting laserdiode.
17. The collimating optical subassembly of claim 15, wherein the spacer element is inserted to allow molten optically transparent material to more easily flow through a mold for fabricating the collimating optical subassembly using standard injection molding techniques.
18. The collimating optical subassembly of claim 15, wherein the prism is made of an optically transparent material, the optically transparent material including any one of polycarbonate, polyolefin and polyethylimide.
19. The collimating optical subassembly of claim 15, wherein the aperture of the aspheric lens is made larger than the waist of collimated light beam outputted from the wedge element.
20. A focusing optical subassembly for redirecting and focusing a collimated light beam, comprising : a wedge element that receives the collimated light beam traveling in air; a spacer element below the wedge element; and an aspheric lens below the spacer element, wherein the focusing optical subassembly is fabricated of optically transparent material and integrated as a single part using injection-molding techniques, and wherein the collimated light beam received by the wedge element travels in air at an angle relative to an axis of the aspheric lens, the wedge element redirecting a chief ray of the collimated beam through the spacer element along the axis of the aspheric lens, the aspheric lens focusing the collimated light beam to a point along its axis.
21. The focusing optical subassembly of claim 20, wherein a photodetector resides at the point to which the collimated light beam is focused by the aspheric lens.
22. The focusing optical subassembly of claim 20, wherein the spacer element is inserted to allow molten optically transparent material to more easily flow through a mold for fabricating the focusing optical subassembly using standard injection molding techniques.
23. An integrated optical assembly, comprising: a fiber collimator that redirects and collimates a light beam from an optical source input, creating a collimated light beam ; at least two focusing optical subassemblies, the at least two focusing optical subassemblies being aligned along a common axis;
and an optically transparent block that receives the collimated light beam from the fiber collimator, the optically transparent block having a top side coated to act as a reflective mirror and a bottom side including thin film filters (TFFs), each with a different passband wavelength and each being positioned over each focusing optical subassembly, the top side being the side opposite to at least one of the fiber collimator and the focusing optical subassemblies, wherein the collimated light beam travels in a zig-zag fashion within the optically transparent block, wavelength components of the collimated light beam being separated from each other by the TFFs with matching passband wavelengths and focused by the focusing optical subassemblies below the TFFs.
24. The integrated optical assembly of claim 23, further comprising: a connector housing that receives a fiber optical connector; and a ledge structure adapted for positioning a printed circuit board, the printed circuit board being parallel to, and at a distance from, aspheric lenses of the focusing optical subassemblies when positioned in the ledge structure.
25. The integrated optical assembly of claim 24, wherein the integrated optical assembly is manufactured using injection molding of an optically transparent plastic.
26. The integrated optical assembly of claim 24, further comprising an optical multiplexer, wherein the connector housing designed to receive a duplex optical fiber, and the printed circuit board being also parallel to, and at a distance from, aspheric lenses of collimating optical subassemblies of the optical multiplexer when positioned in the ledge structure.
27. The integrated optical assembly of claim 26, wherein the integrated optical assembly is manufactured using injection molding of an optically transparent plastic.
28. The integrated optical assembly of claim 26, wherein the set of aspheric lenses belonging to the focusing optical subassemblies have a different prescription than the set of aspheric lenses belonging to the collimating optical subassemblies, and an array of photodetectors and an array of point sources reside on the printed circuit board having different heights.
29. An optical multiplexer of a zig-zag design, comprising: a fiber coupler that redirects and couples a light beam with different wavelength components into an optical fiber; at least two collimating optical subassemblies receiving light beams from different point sources, the at least two collimating optical subassemblies being aligned along a common axis;
an optically transparent block that receives light beams with different wavelength components, the optically transparent block having a top side coated to act as a reflective mirror and a bottom side including thin film filters (TFFs), each with a different passband wavelength and each being positioned over each collimating optical subassembly, the top side being the side opposite to at least one of the fiber coupler and the collimating optical subassemblies, wherein light beams from the point sources travel through the collimating optical subassemblies, the TTFs, the optically transparent block and the fiber coupler into the optical fiber.
30. The optical multiplexer of claim 29, wherein aspheric lenses for collimating and focusing a light beam diverging from one of the point sources having a particular sized aperture are used to project an image from the point source onto the fiber core with a controlled degree of magnification, which controls the sized aperture of the light beam delivered to the optical fiber and the resulting coupling efficiency.
31. The optical multiplexer of claim 29, wherein aspheric lenses for collimating and focusing a light beam diverging from one of the point sources having a particular sized aperture are used to project an image from the point source onto the fiber core with a controlled degree of magnification, which controls the tolerance of the coupling efficiency into the optical fiber to a displacement of the point source.
32. A mold assembly for fabricating an integrated optical assembly as a single injection-molded part, the integrated optical assembly including a connector housing, an optical de-multiplexer and an optical multiplexer, the mold assembly comprising: first and second mold halves arranged to mate with each other, forming a draw direction oriented parallel to axes of aspheric lenses of a focusing optical subassembly of the optical demultiplexer and a collimating optical subassembly of the optical multiplexer, and a single slider used to form ferrules for a fiber collimator of the optical de-multiplexer and a fiber coupler of the optical multiplexer as well as to form the connector housing, wherein the first mold half is used to shape wedges of the collimating and focusing optical subassemblies and to shape aspheric lenses of the fiber collimator and the fiber coupler,
and the second mold half is used to shape total internal reflection surfaces of the fiber collimator and the fiber coupler and to shape the aspheric lenses of the collimating and focusing subassemblies.
32. The mold assembly of claim 32, wherein spacers are interested to allow molten plastic to flow through the mold assembly during manufacturing of the integrated optical assembly as a single injection-molded part.
33. The mold assembly of claim 32, wherein the mold assembly provides a ledge structure to be molded in the single injection-molded part, the ledge structure existing in a plane parallel to the plane tangential to and passing through the apex of each of the aspheric lenses of the collimating and focusing optical subassemblies, the ledge structure allowing a printed circuit board, on which arrays of point sources and photodetectors are mounted, to be inserted and to be parallel, within a few microns of tolerance, to the aspheric lenses of the collimating and focusing optical subassemblies.
34. An integrated optical subassembly, comprising: a fiber coupler that redirects and couples a light beam with different wavelength components into an optical fiber; at least two collimating elements that receives elliptically divergent light beams from edge-emitting lasers, the at least two collimating elements being aligned along a common axis and spaced so that the elliptically divergent light beams become redirected and collimated into circular or nearly circular light beams;
an optically transparent block that receives the circular or nearly circular light beams with different wavelength components, the optically transparent block having a top side coated to act as a reflective mirror and a bottom side including thin film filters (TFFs), each with a different passband wavelength and each being positioned over each collimating element, the top side being the side opposite to at least one of the fiber coupler and the collimating optical subassemblies, wherein the circular or nearly circular light beams travel through the TFFs, the optically transparent block and the fiber coupler into the optical fiber.
36. The integrated optical assembly of claim 35, further comprising: a connector housing that receives a fiber optical connector; and a ledge structure suitable for positioning a printed circuit board, the printed circuit board being parallel to, and at a distance from, aspheric lenses of the collimating elements when positioned in the ledge structure.
37. The integrated optical assembly of claim 36, further comprising an optical de multiplexer, the connector housing designed to receive a duplex optical fiber; and the printed circuit board being also parallel to, and at a distance from, aspheric lenses of focusing optical subassemblies of the optical de-multiplexer when positioned in the ledge structure.
38. The integrated optical assembly of claim 37, wherein the integrated optical assembly is manufactured using injection molding of an optically transparent plastic.
PCT/US2001/046191 2000-11-01 2001-10-31 System and method for collimating and redirecting beams WO2002056077A2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AU2002245067A AU2002245067A1 (en) 2000-11-01 2001-10-31 System and method for collimating and redirecting beams
JP2002556273A JP2004533004A (en) 2000-11-01 2001-10-31 Apparatus and method for collimating and transferring beams
IL15568801A IL155688A0 (en) 2000-11-01 2001-10-31 System and method for collimating and redirecting beams
CA002427593A CA2427593C (en) 2000-11-01 2001-10-31 System and method for collimating and redirecting beams
EP01993213A EP1334390B1 (en) 2000-11-01 2001-10-31 System and method for collimating and redirecting beams
DE60135140T DE60135140D1 (en) 2000-11-01 2001-10-31 SYSTEM AND METHOD FOR COLLIMING AND RETRACTING RADIATION

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US60/244,941 2000-08-11
US24494100P 2000-11-01 2000-11-01

Publications (2)

Publication Number Publication Date
WO2002056077A2 true WO2002056077A2 (en) 2002-07-18
WO2002056077A3 WO2002056077A3 (en) 2003-05-08

Family

ID=22924705

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/046191 WO2002056077A2 (en) 2000-11-01 2001-10-31 System and method for collimating and redirecting beams

Country Status (9)

Country Link
US (2) US6751379B2 (en)
EP (1) EP1334390B1 (en)
JP (1) JP2004533004A (en)
AU (1) AU2002245067A1 (en)
CA (1) CA2427593C (en)
DE (1) DE60135140D1 (en)
IL (1) IL155688A0 (en)
TW (1) TW531673B (en)
WO (1) WO2002056077A2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2397393A (en) * 2002-12-12 2004-07-21 Agilent Technologies Inc Optical element with internally reflecting surface and lens connecting to waveguide
EP1549979A1 (en) * 2002-09-30 2005-07-06 Intel Corporation System and method for packaging a monitor photodiode with a laser in an optical subassembly
WO2006047190A1 (en) * 2004-10-22 2006-05-04 Intel Corporation Surface mount (smt) connector for vcsel and photodiode arrays
CN105938222A (en) * 2015-12-31 2016-09-14 杭州富光科技有限公司 Small-angle-type-filter-plate-based compact type wavelength division multiplexer
EP3422615A1 (en) * 2017-06-28 2019-01-02 Huawei Technologies Co., Ltd. Filter block for an n-channel multiplexing/demultiplexing device and optical wavelength division/demultiplexing device
US11454772B2 (en) * 2018-07-14 2022-09-27 Fuzhou Photop Optics Co., Ltd Short-waveband active optical component based on vertical emitting laser and multi-mode optical fiber

Families Citing this family (105)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6989945B2 (en) * 2001-06-29 2006-01-24 Xanoptix, Inc. Long-throw, tight focusing optical coupler
US7831151B2 (en) 2001-06-29 2010-11-09 John Trezza Redundant optical device array
US20030039008A1 (en) * 2001-08-27 2003-02-27 Michael Davies Optical grating for coarse wavelength division multiplexing (CWDM) applications
NL1019637C2 (en) * 2001-12-21 2003-07-09 Lionix B V Device and method for coupling light into a flat waveguide, device and method for coupling light from a flat waveguide, and methods for manufacturing such devices.
US7286743B2 (en) * 2002-03-01 2007-10-23 Jds Uniphase Corporation High dynamic range integrated receiver
GB0205529D0 (en) * 2002-03-08 2002-04-24 Agilent Technologies Inc Module apparatus
KR100966546B1 (en) * 2002-03-29 2010-06-29 도레이 카부시키가이샤 Laminated film, filter for display, and display
US7180929B2 (en) * 2002-04-18 2007-02-20 Intel Corporation Wafer-level test structure for edge-emitting semiconductor lasers
US6931170B2 (en) * 2002-10-18 2005-08-16 Analog Devices, Inc. Fiber-attached optical devices with in-plane micromachined mirrors
US7272323B2 (en) * 2002-12-04 2007-09-18 Omron Network Products, Llc Bi-directional electrical to optical converter module
US7088526B2 (en) 2003-08-07 2006-08-08 Itt Manufactruing Enterprises, Inc. Lens collimator and method of producing optical signals with reduced aberrations
US7083333B2 (en) * 2003-08-29 2006-08-01 Intel Corporation Optical packages and methods to manufacture the same
JP4461272B2 (en) * 2003-12-02 2010-05-12 富士通オプティカルコンポーネンツ株式会社 Wavelength separation element and optical module
US7184621B1 (en) 2003-12-21 2007-02-27 Lijun Zhu Multi-wavelength transmitter optical sub assembly with integrated multiplexer
CN1561015A (en) * 2004-03-08 2005-01-05 �人��Ѹ�Ƽ��������ι�˾ Three-wave-length light division multiplexer
US7236666B2 (en) * 2004-09-30 2007-06-26 Intel Corporation On-substrate microlens to couple an off-substrate light emitter and/or receiver with an on-substrate optical device
US7283699B2 (en) * 2004-09-30 2007-10-16 Intel Corporation Optical package
US7349602B2 (en) * 2004-10-08 2008-03-25 Agilent Technologies, Inc. Wavelength division multiplexer architecture
US20080260331A1 (en) * 2005-01-27 2008-10-23 Omron Corporation Multiplexer/Demultiplexer, Method for Fabricating the Same, and Optical Multiplexe/Demultiplexer Module
US7416352B2 (en) * 2005-09-08 2008-08-26 Northrop Grumman Corporation Optical multi-channel free space interconnect
US7778503B2 (en) * 2006-03-31 2010-08-17 Nokia Corporation Electronic device having optical data connection of movable housing parts
US7543994B2 (en) 2006-10-19 2009-06-09 Avago Technologies Fiber Ip (Singapore) Pte. Ltd. Multi-optical fiber connector module for use with a transceiver module and method for coupling optical signals between the transceiver module and multiple optical fibers
WO2009006445A2 (en) * 2007-06-29 2009-01-08 Applied Biosystems Systems and methods for electronic detection with nanofets
US7843641B2 (en) * 2007-09-06 2010-11-30 The Boeing Company Illuminated optical inspection prism apparatus
US8121450B2 (en) * 2007-12-12 2012-02-21 Lightwire, Inc. Coupling between free space and optical waveguide using etched coupling surfaces
CN101918872B (en) * 2007-12-26 2014-03-26 株式会社日立制作所 Optical transmission and reception module
JP5251641B2 (en) * 2008-04-28 2013-07-31 オムロン株式会社 Photoelectric sensor
WO2009140075A1 (en) * 2008-05-13 2009-11-19 Lockheed Martin Corporation Radio frequency photonic transceiver
US8985865B2 (en) 2008-11-28 2015-03-24 Us Conec, Ltd. Unitary fiber optic ferrule and adapter therefor
US9479258B1 (en) * 2009-02-24 2016-10-25 Arris Enterprises, Inc. Electrical add/drop multiplexer with pass through port related applications
US8315492B2 (en) * 2009-04-24 2012-11-20 Avago Technologies Fiber Ip (Singapore) Pte. Ltd Fiber connector module including integrated optical lens turn block and method for coupling optical signals between a transceiver module and an optical fiber
WO2011010330A1 (en) * 2009-07-21 2011-01-27 Datalogic Automation S.R.L. Laser system for processing materials with means for focussing and anticipating said focussing of the laser beam; method of obtaining a laser beam at the exit of an optical fibre with predetermined variance
WO2011077723A1 (en) * 2009-12-22 2011-06-30 株式会社エンプラス Lens array and optical module provided therewith
JP2011197018A (en) * 2010-03-17 2011-10-06 Alps Electric Co Ltd Optical element module
KR101176950B1 (en) * 2010-09-17 2012-08-30 주식회사 유나이브 Optical transmitter, optical receiver for passive alignment of parts and method for passive alignment of parts
TWI493896B (en) * 2010-12-30 2015-07-21 Hon Hai Prec Ind Co Ltd Optical fiber communication apparatus
US9557488B2 (en) 2011-01-11 2017-01-31 Corning Incorporated Optical connector with lenses having opposing angled planar surfaces
DE102011102079A1 (en) 2011-05-19 2012-11-22 Ingeneric Gmbh Coupling device for an optical waveguide
US8837883B2 (en) * 2011-09-23 2014-09-16 Alcon Research, Ltd. Shaping laser beam launches into optical fibers to yield specific output effects
CN102354025A (en) * 2011-10-28 2012-02-15 江苏奥雷光电有限公司 Optical fiber end face reflector with light beam direction correction function
TW201337370A (en) 2012-03-08 2013-09-16 Asia Optical Co Inc Optical coupler
CN104641217B (en) * 2012-05-30 2019-02-22 艾瑞斯国际有限公司 Flow cytometer
US9746412B2 (en) 2012-05-30 2017-08-29 Iris International, Inc. Flow cytometer
EP2857879B1 (en) * 2012-06-05 2017-02-08 Enplas Corporation Optical receptacle and optical module provided with same
TWI544244B (en) * 2012-06-29 2016-08-01 鴻海精密工業股份有限公司 Optical coupling lens and optical communication module
US20140082935A1 (en) * 2012-09-27 2014-03-27 Volex Plc Method for passive alignment of optical components to a substrate
US8917997B2 (en) * 2012-10-05 2014-12-23 Applied Micro Circuits Corporation Collimated beam channel with four lens optical surfaces
WO2014055226A1 (en) * 2012-10-05 2014-04-10 3M Innovative Properties Company Optical connector
TW201421006A (en) * 2012-11-22 2014-06-01 Hon Hai Prec Ind Co Ltd Optical coupling lens and measurement system for optical dissipation coefficient
CN103837944A (en) * 2012-11-23 2014-06-04 鸿富锦精密工业(深圳)有限公司 Optical coupling lens and optical dissipation factor measurement system
TW201423187A (en) * 2012-12-03 2014-06-16 Hon Hai Prec Ind Co Ltd Photoelectric conversion device
JP2016102810A (en) * 2013-03-07 2016-06-02 オリンパス株式会社 Coupling optical system
US9323013B2 (en) 2013-04-19 2016-04-26 Avago Technologies General Ip (Singapore) Pte. Ltd. Bidirectional optical communications module having an optics system that reduces optical losses and increases tolerance to optical misalignment
US9429725B2 (en) 2013-04-19 2016-08-30 Avago Technologies General Ip (Singapore) Pte. Ltd. Bidirectional parallel optical transceiver module and a method for bidirectionally communicating optical signals over an optical link
US9110246B2 (en) * 2013-05-29 2015-08-18 Ipg Photonics Corporation High power spatial filter
US10007065B2 (en) 2013-10-31 2018-06-26 Hewlett Packard Enterprise Development Lp Multiplexed optoelectronic engines
JP6322403B2 (en) * 2013-12-09 2018-05-09 矢崎総業株式会社 Single-core bidirectional optical communication module
WO2015112169A1 (en) * 2014-01-25 2015-07-30 Hewlett-Packard Development Company, L.P. Bidirectional optical multiplexing employing a high contrast grating
ES2688210T3 (en) * 2014-04-22 2018-10-31 Huawei Technologies Co., Ltd Optical communications device and procedure
JP2015225979A (en) * 2014-05-28 2015-12-14 日立金属株式会社 Optical communication module
US20160011367A1 (en) * 2014-07-08 2016-01-14 Digital Signal Corporation Apparatus and Method for Terminating an Array of Optical Fibers
WO2016024991A1 (en) 2014-08-15 2016-02-18 Hewlett-Packard Development Company, Lp Optical mode matching
US9843394B2 (en) * 2014-10-06 2017-12-12 Alliance Fiber Optic Products, Inc. Optical transceiver module having unibody structure
WO2016099531A1 (en) * 2014-12-19 2016-06-23 Hewlett Packard Enterprise Development Lp Bonded filter substrates
US20160191192A1 (en) * 2014-12-31 2016-06-30 Xuefeng Yue Assembly of standard dwdm devices for use on free-space multiport dwdm devices
US20160187585A1 (en) * 2014-12-31 2016-06-30 Xuefeng Yue Optical fitler subassembly for compact wavelength demultiplexing device
US10371897B2 (en) * 2014-12-31 2019-08-06 OW Holding Inc. Method and apparatus for providing multiport free-space WDM device using folded optical-path
US9891385B2 (en) * 2015-02-12 2018-02-13 Source Photonics (Chengdu) Co., Ltd. Integrated lens with multiple optical structures and vent hole
WO2016147378A1 (en) * 2015-03-19 2016-09-22 ナルックス株式会社 Optical system and optical element
US9692522B2 (en) * 2015-04-15 2017-06-27 Cisco Technology, Inc. Multi-channel optical receiver or transmitter with a ball lens
US9794017B2 (en) * 2015-08-12 2017-10-17 Finisar Corporation SWDM OSAs
US10820071B2 (en) * 2015-08-13 2020-10-27 Hewlett Packard Enterprise Development Lp Reconfigurable interconnected nodes
US20230296853A9 (en) 2015-10-08 2023-09-21 Teramount Ltd. Optical Coupling
US10564374B2 (en) 2015-10-08 2020-02-18 Teramount Ltd. Electro-optical interconnect platform
US11585991B2 (en) 2019-02-28 2023-02-21 Teramount Ltd. Fiberless co-packaged optics
US9804334B2 (en) * 2015-10-08 2017-10-31 Teramount Ltd. Fiber to chip optical coupler
US10012796B2 (en) 2015-12-28 2018-07-03 Alliance Fiber Optic Products, Inc. MUX/DEMUX comprising capillary filter block and methods of producing the same
CN107102405A (en) * 2016-02-19 2017-08-29 深圳新飞通光电子技术有限公司 A kind of light emission component with aimer, light-receiving component and optical module
US20180017735A1 (en) * 2016-07-13 2018-01-18 Futurewei Technologies, Inc. Wavelength Division Multiplexer/Demultiplexer with Flexibility of Optical Adjustment
JP6764281B2 (en) * 2016-08-09 2020-09-30 太陽誘電株式会社 Gas sensor
WO2018035390A1 (en) * 2016-08-17 2018-02-22 Nanoprecision Products, Inc. Optical fiber connector ferrule assembly having dual reflective surfaces for beam expansion and expanded beam connector incorporating same
FR3060248B1 (en) * 2016-12-09 2019-03-15 Safran Electrical & Power OPTICAL RING OPERATED COMMUNICATION NETWORK FOR AIRCRAFT
US10042121B1 (en) * 2017-03-28 2018-08-07 Nistica, Inc. Toroidal micro lens array for use in a wavelength selective switch
US9995880B1 (en) 2017-03-31 2018-06-12 Foxconn Interconnect Technology Limited Wavelength division multiplexing and demultiplexing in optical communications modules, and methods
US20190052369A1 (en) * 2017-08-08 2019-02-14 Macom Technology Solutions Holdings, Inc. Techniques for high speed optoelectronic coupling by redirection of optical path
US10917190B2 (en) 2018-10-11 2021-02-09 Luxtera Llc Method and system for CWDM MUX/DEMUX designs for silicon photonics interposers
CN111263906A (en) * 2017-10-12 2020-06-09 卢克斯特拉有限公司 Method and system for near normal incidence MUX/DEMUX design
GB201800566D0 (en) * 2018-01-12 2018-02-28 Univ Oxford Innovation Ltd De-multiplexer and method of separating modes of electromagnetic radiation
US10182275B1 (en) * 2017-12-22 2019-01-15 Alliance Fiber Optic Products, Inc. Passive optical subassembly with a signal pitch router
FR3076356B1 (en) * 2017-12-29 2020-01-31 Cailabs Monolithic cavity for the manipulation of light
US10806329B2 (en) * 2018-01-24 2020-10-20 Canon U.S.A., Inc. Optical probes with optical-correction components
US10816789B2 (en) 2018-01-24 2020-10-27 Canon U.S.A., Inc. Optical probes that include optical-correction components for astigmatism correction
US11624879B2 (en) * 2018-02-05 2023-04-11 Inneos, Llc Multi-channel optical coupler
TWI661239B (en) * 2018-06-15 2019-06-01 禾橙科技股份有限公司 Fiber optic module
CN110632711B (en) * 2018-06-21 2021-08-06 禾橙科技股份有限公司 Optical fiber module
US10466429B1 (en) 2018-07-09 2019-11-05 Orangetek Corporation Optical fiber module
US11178392B2 (en) 2018-09-12 2021-11-16 Apple Inc. Integrated optical emitters and applications thereof
WO2020163139A2 (en) 2019-02-04 2020-08-13 Apple Inc. Vertical emitters with integral microlenses
CN110389414A (en) * 2019-07-19 2019-10-29 杭州耀芯科技有限公司 A kind of single fiber bi-directional multimode wavelength-division multiplex photoelectric conversion device and preparation method
CN210401756U (en) * 2019-08-20 2020-04-24 苏州旭创科技有限公司 Optical module
JP7360695B2 (en) * 2019-10-02 2023-10-13 株式会社中原光電子研究所 Optical connection device
KR102450810B1 (en) * 2020-03-19 2022-10-05 한국전자통신연구원 Bidirectional optical transceiver module
WO2022191866A1 (en) * 2021-03-08 2022-09-15 Nlight, Inc. Suppression of undesired wavelengths in laser light
US11496218B1 (en) * 2021-05-03 2022-11-08 Mellanox Technologies, Ltd. Optical communication modules with improved security
CN113197555A (en) * 2021-06-04 2021-08-03 哈尔滨医科大学 Multi-direction OCT image acquisition catheter

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5849170B2 (en) 1977-10-25 1983-11-02 旭化成株式会社 Injection mold with coat hanger type gate
JPS54103055A (en) * 1978-01-31 1979-08-14 Nippon Telegr & Teleph Corp <Ntt> Spectrometer
JPS59200210A (en) * 1983-04-28 1984-11-13 Toshiba Corp Optical demultiplexer
JPS6253409U (en) * 1985-09-20 1987-04-02
US4883333A (en) * 1987-10-13 1989-11-28 Yanez Serge J Integrated, solid, optical device
US5148322A (en) 1989-11-09 1992-09-15 Omron Tateisi Electronics Co. Micro aspherical lens and fabricating method therefor and optical device
US5159491A (en) 1990-02-20 1992-10-27 Eastman Kodak Company Combination collimating lens and correcting prism
US5688261A (en) * 1990-11-07 1997-11-18 Premier Laser Systems, Inc. Transparent laser surgical probe
JPH04225306A (en) * 1990-12-26 1992-08-14 Takenaka Denshi Kogyo Kk Device for changing optical axis of optical fiber cable
JPH0634854A (en) * 1992-07-20 1994-02-10 Nec Corp Pd module
EP0613032B1 (en) * 1993-02-23 1999-01-20 The Whitaker Corporation Fiber optic coupling devices
JPH0829161A (en) * 1994-07-15 1996-02-02 Keyence Corp Light direction converter and photoelectric switch using it
US5742720A (en) 1995-08-30 1998-04-21 Matsushita Electric Industrial Co., Ltd. Optical coupling module and method for producing the same
US6034823A (en) 1997-02-07 2000-03-07 Olympus Optical Co., Ltd. Decentered prism optical system
US6198864B1 (en) * 1998-11-24 2001-03-06 Agilent Technologies, Inc. Optical wavelength demultiplexer
US6269203B1 (en) * 1999-03-17 2001-07-31 Radiant Photonics Holographic optical devices for transmission of optical signals
US6201908B1 (en) * 1999-07-02 2001-03-13 Blaze Network Products, Inc. Optical wavelength division multiplexer/demultiplexer having preformed passively aligned optics
US6296203B1 (en) * 2000-05-24 2001-10-02 General Electric Company Snubber thrust mount
US20020067886A1 (en) * 2000-12-01 2002-06-06 Schaub Michael P. Optical fiber output beam-shaping device for a wavelength division multiplexer (WDM) assembly

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1549979A1 (en) * 2002-09-30 2005-07-06 Intel Corporation System and method for packaging a monitor photodiode with a laser in an optical subassembly
GB2397393A (en) * 2002-12-12 2004-07-21 Agilent Technologies Inc Optical element with internally reflecting surface and lens connecting to waveguide
US6921214B2 (en) 2002-12-12 2005-07-26 Agilent Technologies, Inc. Optical apparatus and method for coupling output light from a light source to an optical waveguide
GB2397393B (en) * 2002-12-12 2007-05-16 Agilent Technologies Inc Optical apparatus and method
WO2006047190A1 (en) * 2004-10-22 2006-05-04 Intel Corporation Surface mount (smt) connector for vcsel and photodiode arrays
US8412052B2 (en) 2004-10-22 2013-04-02 Intel Corporation Surface mount (SMT) connector for VCSEL and photodiode arrays
CN105938222A (en) * 2015-12-31 2016-09-14 杭州富光科技有限公司 Small-angle-type-filter-plate-based compact type wavelength division multiplexer
CN105938222B (en) * 2015-12-31 2019-12-10 杭州富光科技有限公司 compact wavelength division multiplexer based on small-angle filter plate
EP3422615A1 (en) * 2017-06-28 2019-01-02 Huawei Technologies Co., Ltd. Filter block for an n-channel multiplexing/demultiplexing device and optical wavelength division/demultiplexing device
US11454772B2 (en) * 2018-07-14 2022-09-27 Fuzhou Photop Optics Co., Ltd Short-waveband active optical component based on vertical emitting laser and multi-mode optical fiber
US11828992B2 (en) 2018-07-14 2023-11-28 Ii-Vi Delaware, Inc. Short-waveband active optical component based on vertical emitting laser and multi-mode optical fiber

Also Published As

Publication number Publication date
JP2004533004A (en) 2004-10-28
US20020064191A1 (en) 2002-05-30
CA2427593C (en) 2010-03-09
EP1334390B1 (en) 2008-07-30
EP1334390A2 (en) 2003-08-13
DE60135140D1 (en) 2008-09-11
IL155688A0 (en) 2003-11-23
US6751379B2 (en) 2004-06-15
US6941047B2 (en) 2005-09-06
WO2002056077A3 (en) 2003-05-08
CA2427593A1 (en) 2002-07-18
AU2002245067A1 (en) 2002-07-24
TW531673B (en) 2003-05-11
US20040165828A1 (en) 2004-08-26

Similar Documents

Publication Publication Date Title
CA2427593C (en) System and method for collimating and redirecting beams
US6870976B2 (en) Filter based multiplexer/demultiplexer component
US6769816B2 (en) Multi-wavelength transceiver device with integration on transistor-outline cans
US7198416B2 (en) Optical combiner device
JP4554132B2 (en) Optical wavelength division multiplexer / demultiplexer in which preformed optical components are passively aligned
US10222553B2 (en) Multiplexer/demultiplexer using stamped optical bench with micro mirrors
US7184621B1 (en) Multi-wavelength transmitter optical sub assembly with integrated multiplexer
US6542306B2 (en) Compact multiple channel multiplexer/demultiplexer devices
US6571033B2 (en) Optical signal device
US6832031B2 (en) Optical modifier and method for the manufacture thereof
WO2001086329A2 (en) Cost-effective wavelength division multiplexer and demultiplexer
US20130064507A1 (en) Wavelength division multiplexing device
JP2000162466A (en) Optical demultiplexer
US6757460B2 (en) Electro-optical module for transmitting and/or receiving optical signals on at least two optical data channels
US7397988B2 (en) Grating based multiplexer/demultiplexer component
CN116068700A (en) Wavelength division multiplexing device
JP2003107276A (en) Optical fiber collimator, lens for optical fiber collimator and optical coupling parts
JP4118756B2 (en) Multiplexer / demultiplexer
JP2005301166A (en) Optical multiplexer/demultiplexer

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK DM EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWE Wipo information: entry into national phase

Ref document number: 155688

Country of ref document: IL

Ref document number: 2427593

Country of ref document: CA

WWE Wipo information: entry into national phase

Ref document number: 2002556273

Country of ref document: JP

WWE Wipo information: entry into national phase

Ref document number: 2001993213

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 2001993213

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWE Wipo information: entry into national phase

Ref document number: 184219

Country of ref document: IL