CN103454783A - Microwave photon band-pass filter based on cascaded chromatic dispersion devices - Google Patents
Microwave photon band-pass filter based on cascaded chromatic dispersion devices Download PDFInfo
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Abstract
The invention discloses a microwave photon band-pass filter based on cascaded chromatic dispersion devices. The microwave photon band-pass filter comprises a light source (1), an isolator (2), a phase modulator (3), a circulator (4), an optical grating I (5), an Er-doped fiber (6), an optical grating II (7), a wavelength division multiplexer (8), a 980 nm or 1480 nm pumping source (9), a single mode fiber (10) and a photoelectric detector (11). Compared with the other microwave photon filters, the microwave photon band-pass filter is simple in structure, and low in cost, and can realize the functions of tuning, narrow band and high frequency selectivity. The fiber bragg gratings adopted by the filter is uniform fiber bragg gratings or chirped fiber bragg gratings. The wavelength of the gratings can be adjusted to be matched with the wavelength of the light source to realize the tuning function.
Description
Technical field
The invention belongs to optical fiber communication and signal process field, specifically, relate in the light territory and directly microwave signal being processed.
Background technology
The appearance of light WDM technology and Erbium-Doped Fiber Amplifier (EDFA), make optical fiber communication obtain development rapidly.Optical fiber communication is low except having loss, and the characteristic that anti-electromagnetic interference (EMI) and bandwidth are high also easily realizes on wavelength, multiplexing on space and on polarization.Simultaneously, along with the continuous increase of the demand to wireless communication capacity, microwave technology is also in development rapidly.Very large for the loss of medium when growing Distance Transmission of transmitting microwave signal in the past, and fibre system has low-loss, high bandwidth, is well suited for transmission and processing for microwave signal.
Optical fiber technology and microwave technology combine becomes a new research direction.In theory, microwave technology is the same with optical fiber technology theoretical foundation, is all electromagnetic wave theory.The unification of theoretical foundation has promoted the combination of these two subjects greatly, has produced a new subject---Microwave photonics.
Microwave photon filter is one of gordian technique of Microwave photonics, and it is processed radiofrequency signal on the light territory, the electronic bottleneck produced while having solved processing signals in electric territory.The modulated device of radiofrequency signal is modulated on light carrier, in the light territory, the light signal that is loaded with radiofrequency signal is processed afterwards, finally by photodetector, exports required radiofrequency signal.
Microwave photon filter is according to whether limited finite impulse response filter and the IIR filter of being divided into of tap number.The IIR filter major part is based on ring retard, has and uses optionally characteristic of the few and high-frequency of element, and finite impulse response filter improves quality factor by increasing number of taps, and still required element is more, and cost is higher.In order to improve quality factor, by IIR filter and the cascade of finite impulse response filter phase, so both can save cost, can increase substantially quality factor again.
The microwave photon filter based on the Dispersive Devices cascade that the present invention proposes, improved the quality factor of microwave photon filter by the cascade of ring retard and single-mode fiber, make wave filter have very high frequency selectivity.
Summary of the invention
The objective of the invention is to realize optionally microwave photon bandpass filter structures of a kind of low cost, tunable, narrow bandwidth, high-frequency.
The technical scheme of this invention is:
A kind of microwave photon bandpass filter based on the Dispersive Devices cascade, it comprises: light source (1), isolator (2), phase-modulator (3), circulator (4), grating one (5), Er-doped fiber (6), grating two (7), wavelength division multiplexer (8), 980nm or 1480nm pumping source (9), single-mode fiber (10) and photodetector (11); Light source (1) connects the input end of isolator (2); The first port a of the output termination phase-modulator (3) of isolator (2); Second port (b) of phase-modulator (3) is the rf inputs mouth; The 3rd port c of phase-modulator (3) meets the first port a of circulator (4); The second port b of circulator (4) meets the first port a of grating one (5); The second port b of grating one (5) connects the input end of Er-doped fiber (6); The first port a of the output termination grating two (7) of Er-doped fiber (6); The second port b of grating two (7) meets the first port a of wavelength division multiplexer (8); The 3rd port c of wavelength division multiplexer (8) connects 980nm or 1480nm pumping source (9); The input end of the 3rd port c order mode fiber (10) of circulator (4); The input end of the output termination photodetector (11) of single-mode fiber (10); The output terminal of photodetector (11) is radio frequency output port.
The IIR filter of the grating pair based on being formed by described grating one (5) and grating two (7) and the finite impulse response filter phase cascade based on single-mode fiber (10), grating pair and single-mode fiber (10), jointly as delay cell, make wave filter have narrow-band characteristic and high-frequency selectivity simultaneously.
Described grating one (5) is identical with grating two (7) wavelength, forms grating pair, can be all uniform fiber grating or chirped fiber grating.
Enter grating one (5) by the signal after described phase-modulator (3) modulation through circulator (4), wherein a part of light signal is reflected by grating one (5), the transmission of another part light signal is crossed grating one (5) after the amplification of Er-doped fiber (6), by grating two (7) part reflections, after amplifying, Er-doped fiber (6) again enters into grating one (5), the light signal transmission that grating two (7) reflects is exported through circulator (4) after crossing grating one (5), formed the tap of impulse response, by grating one (5) the amplification repetitive process that the light signal of secondary reflection passes through Er-doped fiber (6) again again, light signal between grating pair ceaselessly usable reflection produce a large amount of taps, thereby realize the high-frequency selectivity.
Described light source is tunable laser, laser array or multiple-wavelength laser.
Wavelength by changing grating one (5) and grating two (7) and the wavelength of light source are complementary and realize tunable function.
advantage of the present invention and beneficial effect:
By by the IIR filter based on grating pair and finite impulse response filter phase cascade based on dispersive optical fiber, grating pair and dispersive optical fiber are jointly as delay cell, form a large amount of taps between grating pair, make wave filter there is the high-frequency selectivity, make it wavelength with light source by the wavelength of regulating grating and be complementary and realize tunable function.The present invention is simple in structure, and cost is low, has realized optionally function of tunable, arrowband and high-frequency simultaneously.
the accompanying drawing explanation
Fig. 1 is the microwave photon bandpass filter structures schematic diagram based on the Dispersive Devices cascade of the embodiment of the present invention 1;
In figure: 1. light source, 2. isolator, 3. phase-modulator, 4. circulator, 5. grating one, 6. Er-doped fiber, 7. grating two, 8. wavelength division multiplexer, 9.980nm or 1480nm pumping source, 10. single-mode fiber, 11. photodetectors.
The frequency response chart that Fig. 2 is the IIR filter based on grating pair;
In figure: the gain that g is Er-doped fiber 6.
The frequency response chart that Fig. 3 is the microwave photon filter based on the dispersive medium cascade.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
This microwave photon bandpass filter structures based on the Dispersive Devices cascade, it comprises: light source (1), isolator (2), phase-modulator (3), circulator (4), grating one (5), Er-doped fiber (6), grating two (7), wavelength division multiplexer (8), 980nm or 1480nm pumping source (9), single-mode fiber (10) and photodetector (11).
Light source (1) connects the input end of isolator (2); The first port a of the output termination phase-modulator (3) of isolator (2); The port b of phase-modulator (3) is the rf inputs mouth; The 3rd port c of phase-modulator (3) meets the first port a of circulator (4); The second port b of circulator (4) meets the first port a of grating one (5); The second port b of grating one (5) connects the input end of Er-doped fiber (6); The first port a of the output termination grating two (7) of Er-doped fiber (6); The second port b of grating two (7) meets the first port a of wavelength division multiplexer (8); The 3rd port c of wavelength division multiplexer (8) connects 980nm or 1480nm pumping source (9); The input end of the 3rd port c order mode fiber (10) of circulator (4); The input end of the output termination photodetector (11) of single-mode fiber (10); The output terminal of photodetector (11) is radio frequency output port.
As shown in Figure 1, enter grating one (5) by the signal after phase-modulator (3) modulation through circulator, wherein a part of light signal is reflected by grating one (5), the transmission of another part light signal is crossed grating one (5) after the amplification of Er-doped fiber (6), by grating two (7) part reflections, after amplifying, Er-doped fiber (6) again enters into grating one (5), the light signal transmission reflected through grating two (7) is exported through circulator (4) after crossing grating one (5), formed the tap of impulse response, by grating one (5) the amplification repetitive process that the light signal of secondary reflection passes through Er-doped fiber (6) again again, light signal between grating pair ceaselessly usable reflection produce a large amount of taps.
These a large amount of taps enter single-mode fiber (10) through the port c of circulator (4), through the time delay of single-mode fiber (10), enter into photodetector (11), export required radiofrequency signal.These a large amount of taps are to realize that high-frequency is optionally crucial.
The reflectivity R that accompanying drawing 2 is fixed grating one (5)
1be 1/2, the reflectivity R of grating two (7)
2be 1 o'clock, change the frequency response analogous diagram of the IIR filter that the gain g of Er-doped fiber (6) is corresponding, as can be seen from Figure, now, obtain the narrowest position that 3 dB bandwidth get and satisfy condition
.
Claims (6)
1. the microwave photon bandpass filter based on the Dispersive Devices cascade, is characterized in that: comprising: light source (1), isolator (2), phase-modulator (3), circulator (4), grating one (5), Er-doped fiber (6), grating two (7), wavelength division multiplexer (8), 980nm or 1480nm pumping source (9), single-mode fiber (10) and photodetector (11); Light source (1) connects the input end of isolator (2); First port (a) of the output termination phase-modulator (3) of isolator (2); Second port (b) of phase-modulator (3) is the rf inputs mouth; The 3rd port (c) of phase-modulator (3) connects first port (a) of circulator (4); Second port (b) of circulator (4) connects first port (a) of grating one (5); Second port (b) of grating one (5) connects the input end of Er-doped fiber (6); First port (a) of the output termination grating two (7) of Er-doped fiber (6); Second port (b) of grating two (7) connects first port (a) of wavelength division multiplexer (8); The 3rd port (c) of wavelength division multiplexer (8) connects 980nm or 1480nm pumping source (9); The input end of the 3rd port (c) order mode fiber (10) of circulator (4); The input end of the output termination photodetector (11) of single-mode fiber (10); The output terminal of photodetector (11) is radio frequency output port.
2. the microwave photon bandpass filter based on the Dispersive Devices cascade as claimed in claim 1, it is characterized in that: the IIR filter of the grating pair based on being formed by described grating one (5) and grating two (7) and the finite impulse response filter phase cascade based on single-mode fiber (10), grating pair and single-mode fiber (10), jointly as delay cell, make wave filter have narrow-band characteristic and high-frequency selectivity simultaneously.
3. the microwave photon bandpass filter based on the Dispersive Devices cascade as claimed in claim 1, it is characterized in that: described grating one (5) is identical with grating two (7) wavelength, and is all uniform fiber grating or chirped fiber grating.
4. the microwave photon bandpass filter based on the Dispersive Devices cascade as claimed in claim 1, it is characterized in that: by the light signal after described phase-modulator (3) modulation, through circulator (4), enter grating one (5), wherein a part of light signal is reflected by grating one (5), the transmission of another part light signal is crossed grating one (5) after the amplification of Er-doped fiber (6), by grating two (7) part reflections, after amplifying, Er-doped fiber (6) again enters into grating one (5), the light signal transmission that grating two (7) reflects is exported through circulator (4) after crossing grating one (5), formed the tap of impulse response, by grating one (5) the amplification repetitive process that the light signal of secondary reflection passes through Er-doped fiber (6) again again, light signal between grating pair ceaselessly usable reflection produce a large amount of taps, thereby realize the high-frequency selectivity.
5. the microwave photon bandpass filter based on the Dispersive Devices cascade as claimed in claim 1, it is characterized in that: described light source is tunable laser, laser array or multiple-wavelength laser.
6. the microwave photon bandpass filter based on the Dispersive Devices cascade as claimed in claim 1 is characterized in that: the wavelength by changing grating one (5) and grating two (7) and the wavelength of light source are complementary and realize tunable function.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104932121A (en) * | 2015-06-25 | 2015-09-23 | 天津理工大学 | Microwave photon filter based on multi-wavelength fiber laser and chirp Bragg gratings |
| CN106788865A (en) * | 2016-12-12 | 2017-05-31 | 南京理工大学 | The true time delay experimental provision of wavelength-division multiplex and method based on fiber reflector and LCFBG |
| CN106877932A (en) * | 2016-11-04 | 2017-06-20 | 西安电子科技大学 | The optical fiber transmission method of broadband signal is realized using phase-modulator |
| CN109186643A (en) * | 2018-06-21 | 2019-01-11 | 上海第二工业大学 | A kind of accurate sensor-based system and method for sensing based on reflection function resonance filter |
| CN110174661A (en) * | 2019-05-10 | 2019-08-27 | 浙江大学 | A kind of optical phased array two-dimensional laser radar scanning chip based on palarization multiplexing |
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2013
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104932121A (en) * | 2015-06-25 | 2015-09-23 | 天津理工大学 | Microwave photon filter based on multi-wavelength fiber laser and chirp Bragg gratings |
| CN106877932A (en) * | 2016-11-04 | 2017-06-20 | 西安电子科技大学 | The optical fiber transmission method of broadband signal is realized using phase-modulator |
| CN106788865A (en) * | 2016-12-12 | 2017-05-31 | 南京理工大学 | The true time delay experimental provision of wavelength-division multiplex and method based on fiber reflector and LCFBG |
| CN106788865B (en) * | 2016-12-12 | 2018-06-12 | 南京理工大学 | Wavelength-division multiplex based on fiber reflector and LCFBG is really delayed experimental provision and method |
| CN109186643A (en) * | 2018-06-21 | 2019-01-11 | 上海第二工业大学 | A kind of accurate sensor-based system and method for sensing based on reflection function resonance filter |
| CN109186643B (en) * | 2018-06-21 | 2021-10-29 | 上海第二工业大学 | Accurate sensing system and sensing method based on reflection function resonant filter |
| CN110174661A (en) * | 2019-05-10 | 2019-08-27 | 浙江大学 | A kind of optical phased array two-dimensional laser radar scanning chip based on palarization multiplexing |
| CN110174661B (en) * | 2019-05-10 | 2024-04-16 | 浙江大学 | Optical phased array two-dimensional laser radar scanning chip based on polarization multiplexing |
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Application publication date: 20131218 |