CN101686096B - Multi-carrier coherent reception electric treatment method, device and system - Google Patents
Multi-carrier coherent reception electric treatment method, device and system Download PDFInfo
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- CN101686096B CN101686096B CN2008102165107A CN200810216510A CN101686096B CN 101686096 B CN101686096 B CN 101686096B CN 2008102165107 A CN2008102165107 A CN 2008102165107A CN 200810216510 A CN200810216510 A CN 200810216510A CN 101686096 B CN101686096 B CN 101686096B
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Abstract
The embodiment of the invention relates to the communication transmission field, in particular discloses a multi-carrier coherent reception electric treatment method, device and system. The device comprises a photon carrier separator, a first polarization controller and a second polarization controller, a sub carrier generating module as well as a first coherent reception electric treatment module and a second coherent reception electric treatment module; wherein the photon carrier separator is used for extracting two single carrier dual-polarization signals; the first polarization controller and the second polarization controller respectively are used for polarization control on the two single carrier dual-polarization signals, so as to generate two polarization control signals; the sub carrier generating module is used for generating two photon carriers which are the same with the wavelength of the two single carrier dual-polarization signals respectively; the first coherent reception electric treatment module and the second coherent reception electric treatment module are respectively used for coherent reception electric treatment on the two single carrier dual-polarization signals and the two photon carriers, so as to obtain two polarization state signals. The invention solves the problem that ADC chip sampling rate requirement is high as baud rate is high in signal coherent reception and improves stability of transport network.
Description
Technical field
The present invention relates to field of communication transmission, relate in particular to a kind of methods, devices and systems of multi-carrier coherent reception electric treatment.
Background technology
Development along with the communication technology, single ripple transmission rate by 10G to 40G and the evolution of 100G direction, chromatic dispersion (chromatic Dispersion, CD), polarization mode dispersion (Polarization Mode Dispersion, PMD) etc. system tolerance is more and more less, becomes the long key factor apart from transmission of restriction.Industry trends towards adopting falls baud rate and adds the relevant mode of accepting electric treatment, various damages in the transmission are compensated, promote CD, PMD tolerance limit, but the requirement for the ADC in the High-speed Electric process chip (Analog digital converter, analog to digital converter) and algorithm process chip is still very high.
Fig. 1 is that the single carrier dual-polarization signal that prior art adopts produces principle schematic.Light source (Laser Diode, LD) standard wave length's who sends light signal is through polarization beam apparatus (Polarization Beam Splitter, PBS) be divided into X, two polarization state light signals of Y, again respectively at X, modulation QPSK signal on two polarization state light signals of Y, through polarization beam combiner (Polarization Beam Combiner, PBC) close ripple after, PDM-QPSK (Polarization division multiplexing-Quadrature phase shift keying, the palarization multiplexing quarternary phase-shift keying (QPSK)) signal of last output single carrier dual-polarization.
Fig. 2 is the multiplexing relevant electric treatment demodulation schematic diagram of single carrier dual-polarization that prior art adopts.Single carrier PDM-QPSK signal is divided into two polarization state signals of X, Y through PBS, and the light signal that then sends with local light source is inputted together into 90 ° of frequency mixers; After 90 ° of frequency mixer outputs, just obtain respectively I, the Q signal of telecommunication on two polarization state signals of X, Y through balanced reciver again; At last, I on two polarization states of X, Y, the Q signal of telecommunication are through amplifier, analog to digital converter (Analog digital converter, ADC) and digital signal processor (Digital Signal Processor, DSP) process two polarization state restituted signals of rear output X, Y, realized demodulation.
But simultaneously, the inventor is in research process, find a prior art QPSK signal at a carrier wave modulation palarization multiplexing, such as the single carrier PDM-QPSK signal described in the top scheme, a code element of this signal has comprised 4 bits (I, the Q signals of telecommunication on two polarization state signals of X, Y), under same symbol speed, its corresponding baud rate is higher, sample rate to the ADC chip that adopts relevant electric treatment requires very high, bandwidth requirement for the receiver optical device is also higher, be unfavorable for the realization of product, and the availability of frequency spectrum is not high.
Summary of the invention
The embodiment of the invention provides a kind of device of multi-carrier coherent reception electric treatment, comprises,
Photon carrier separation device is for separating of the signal-A signal that goes out the single carrier dual-polarization and signal-B signal; The first Polarization Controller is used for the signal-A signal is carried out Polarization Control, produces the Polarization Control signal of signal-A; The second Polarization Controller is used for the signal-B signal is carried out Polarization Control, produces the Polarization Control signal of signal-B; The subcarrier generation module, for generation of with the wavelength of signal-A signal and signal-B signal respectively identical two photon carrier wave SC-1 signals and SC-2 signal; The first coherent reception electric treatment module is used for Polarization Control signal and the SC-1 signal of signal-A are carried out coherent reception electric treatment, obtains the X-polarization state signal of signal-A and the Y-polarization state signal of signal-A; The second coherent reception electric treatment module is used for Polarization Control signal and the SC-2 signal of signal-B are carried out coherent reception electric treatment, obtains the X-polarization state signal of signal-B and the Y-polarization state signal of signal-B.
The embodiment of the invention provides a kind of method of multi-carrier coherent reception electric treatment, comprises,
Isolate signal-A signal and the signal-B signal of single carrier dual-polarization; The signal-A signal is carried out Polarization Control, produce the Polarization Control signal of signal-A; The signal-B signal is carried out Polarization Control, produce the Polarization Control signal of signal-B; Produce with the wavelength of signal-A signal and signal-B signal and distinguish identical two photon carrier wave SC-1 signals and SC-2 signal; Polarization Control signal and the SC-1 signal of signal-A are carried out coherent reception electric treatment, obtain the X-polarization state signal of signal-A and the Y-polarization state signal of signal-A; Polarization Control signal and the SC-2 signal of signal-B are carried out coherent reception electric treatment, obtain the X-polarization state signal of signal-B and the Y-polarization state signal of signal-B.。
The embodiment of the invention also provides a kind of system of multi-carrier coherent reception electric treatment, comprises,
Two carrier wave dual-polarization signal generator modules are for generation of two carrier wave dual-polarization signals; Photon carrier separation device is used for from two carrier wave dual-polarization signals, isolates signal-A signal and the signal-B signal of single carrier dual-polarization; The first Polarization Controller is used for the signal-A signal is carried out Polarization Control, produces the Polarization Control signal of signal-A; The second Polarization Controller is used for the signal-B signal is carried out Polarization Control, produces the Polarization Control signal of signal-B; The subcarrier generation module, for generation of with the wavelength of signal-A signal and signal-B signal respectively identical two photon carrier wave SC-1 signals and SC-2 signal; The first coherent reception electric treatment module is used for Polarization Control signal and the SC-1 signal of signal-A are carried out coherent reception electric treatment, obtains the X-polarization state signal of signal-A and the Y-polarization state signal of signal-A; The second coherent reception electric treatment module is used for Polarization Control signal and the SC-2 signal of signal-B are carried out coherent reception electric treatment, obtains the X-polarization state signal of signal-B and the Y-polarization state signal of signal-B.
This shows, in embodiments of the present invention, reduce line speed by increasing number of sub carrier wave, solved prior art baud rate height when signal coherence receives and caused the demanding problem of ADC chip sample rate.Simultaneously, reach better depolarization, solved prior art baud rate height when signal coherence receives and caused the demanding problem of ADC chip sample rate, improved the stability of transmission network, be conducive to the realization of product.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, does not consist of limitation of the invention.In the accompanying drawings:
The single carrier dual-polarization signal that the prior art that shows Fig. 1 adopts produces principle schematic;
Fig. 2 shows the multiplexing relevant electric treatment demodulation schematic diagram of single carrier dual-polarization that prior art adopts;
The multicarrier dual-polarization signal that the embodiment of the invention that shows Fig. 3 adopts produces principle schematic;
The relevant electric treatment demodulation schematic diagram of the multicarrier dual-polarization signal multiplexing that the embodiment of the invention that shows Fig. 4 adopts;
Fig. 5 shows the first coherent reception electric treatment module diagram in the embodiment of the invention;
Fig. 6 shows the second coherent reception electric treatment module diagram in the embodiment of the invention.
Embodiment
Understand and realization the present invention the existing embodiments of the invention of describing by reference to the accompanying drawings for the ease of persons skilled in the art.At this, illustrative examples of the present invention and explanation thereof are used for explanation the present invention, but not as a limitation of the invention.
Fig. 3 is that the multicarrier dual-polarization signal that the embodiment of the invention adopts produces principle schematic.The monochromatic light carrier wave that light source LD sends produces subcarrier SC through the subcarrier maker.This subcarrier SC by comb filter (interleaver, IL), produces two photon carrier wave SC-A and SC-B again.Photon carrier wave SC-A and SC-B be input polarization beam splitter 1 (Polarization Beam Splitter respectively, PBS) and polarization beam apparatus 2 (Polarization Beam Splitter, PBS) in, beam splitting effect through polarization beam apparatus is divided into photon carrier wave SC-A and SC-B respectively: the X polarization state signal of the X polarization state signal of SC-A, the Y polarization state signal of SC-A, SC-B and the Y polarization state signal of SC-B; The X polarization state signal of the X polarization state signal of SC-A, the Y polarization state signal of SC-A, SC-B and the Y polarization state signal of SC-B by the QPSK signal modulation of optical modulator 1, optical modulator 2, optical modulator 3, optical modulator 4, modulate respectively the X palarization multiplexing data-signal of SC-A, the Y palarization multiplexing data-signal of SC-A, the X palarization multiplexing data-signal of SC-B, the Y palarization multiplexing data-signal of SC-B respectively on each subcarrier; This four road palarization multiplexings data-signal passes through respectively PBC 1 (Polarization Beam Combiner, polarization beam combiner) and PBC2 (Polarization Beam Combiner, polarization beam combiner) close ripple after, signal-A signal and the signal-B signal of last output single carrier dual-polarization.At last, signal-A signal and signal-B signal are through the ripple effect of closing of optical coupler, the two carrier wave dual-polarization signal PDM-QPSK (Polarization division multiplexing-Quadrature phase shift keying, palarization multiplexing quarternary phase-shift keying (QPSK)) of output.If obtain many ripples signals such as three carrier waves, four carrier waves, need above-mentioned each device is repeated a plurality of settings, principle is the same, does not repeat them here.
Fig. 4 is the relevant electric treatment demodulation schematic diagram of multicarrier dual-polarization signal multiplexing that the embodiment of the invention adopts.Photon carrier separation device is for separating of the signal-A signal that goes out the single carrier dual-polarization and signal-B signal.The first Polarization Controller (Polarization controller-1, PC1) is used for the signal-A signal is carried out Polarization Control, produces the Polarization Control signal of signal-A.The second Polarization Controller (Polarization controller-2, PC2) is used for the signal-B signal is carried out Polarization Control, produces the Polarization Control signal of signal-B.The subcarrier generation module, for generation of with the wavelength of signal-A signal and signal-B signal respectively identical two photon carrier wave SC-1 signals and SC-2 signal.The first coherent reception electric treatment module is used for Polarization Control signal and the SC-1 signal of signal-A are carried out coherent reception electric treatment, obtains the X-polarization state signal of signal-A and the Y-polarization state signal of signal-A.The second coherent reception electric treatment module is used for Polarization Control signal and the SC-2 signal of signal-B are carried out coherent reception electric treatment, obtains the X-polarization state signal of signal-B and the Y-polarization state signal of signal-B.If many ripples signals such as obtaining three carrier waves, four carrier waves will be carried out coherent reception electric treatment, need above-mentioned each device is repeated a plurality of settings, principle is the same, does not repeat them here.
Further, the subcarrier generation module specifically comprises, local light source (LD), subcarrier maker and photon carrier separation device.Local light source is for generation of single-frequency carrier wave light signal.The subcarrier maker, be used for single-frequency carrier wave optical signal modulation be two with the wavelength of signal-A signal and signal-B signal respectively identical two photon carrier wave SC-1 signals that mix and SC-2 signal.Photon carrier separation device is for separating of going out SC-1 signal and SC-2 signal.
Fig. 5 is the first coherent reception electric treatment module diagram in the embodiment of the invention.The first coherent reception electric treatment module specifically comprises, the first coherent reception module and the first electric treatment module.The first coherent reception module is used for Polarization Control signal and the SC-1 signal of signal-A are carried out the coherent reception processing, obtains the X polarization state electric signal of signal-A and the Y polarization state electric signal of signal-A.The first electric treatment module is used for the X polarization state electric signal of signal-A and the Y polarization state electric signal of signal-A are carried out electric treatment, obtains the X-polarization state signal of signal-A, the Y-polarization state signal of signal-A.
Further, the first coherent reception module specifically comprises, the first polarization beam apparatus, the one 90 degree frequency mixer, the second polarization beam apparatus, the 2 90 degree frequency mixer, the first photodetector, the second photodetector, the first amplifier, the second amplifier, the 3rd amplifier, the 4th amplifier.
The first polarization beam apparatus, the Polarization Control signal polarization beam splitting that is used for signal-A that the first Polarization Controller is produced is the X polarization state signal of signal-A and the Y polarization state signal of signal-A.The second polarization beam apparatus, being used for the beam splitting of SC-1 signal polarization is the X polarization state signal of SC-1 and the Y polarization state signal of SC-1.The one 90 degree frequency mixer, being used for X polarization state signal with the X polarization state signal of signal-A and SC-1, to carry out mixing relevant, obtains the X polarization state coherent signal of signal-A.The first photodetector is used for the X polarization state coherent signal of signal-A is carried out opto-electronic conversion, obtains the Q signal of telecommunication of the X polarization state of the I signal of telecommunication of X polarization state of signal-A and signal-A.The 2 90 degree frequency mixer, being used for Y polarization state signal with the Y polarization state signal of signal-A and SC-1, to carry out mixing relevant, obtains the Y polarization state coherent signal of signal-A.The second photodetector is used for the Y polarization state coherent signal of signal-A is carried out opto-electronic conversion, obtains the Q signal of telecommunication of the Y polarization state of the I signal of telecommunication of Y polarization state of signal-A and signal-A.
The first amplifier is used for the I signal of telecommunication amplification with the X polarization state of signal-A, the I signal of telecommunication of the X polarization state of the signal-A after obtaining amplifying.The second amplifier is used for the Q signal of telecommunication amplification with the X polarization state of signal-A, the Q signal of telecommunication of the X polarization state of the signal-A after obtaining amplifying.The 3rd amplifier is used for the I signal of telecommunication amplification with the Y polarization state of signal-A, the I signal of telecommunication of the Y polarization state of the signal-A after obtaining amplifying.The 4th amplifier is used for the Q signal of telecommunication amplification with the Y polarization state of signal-A, the Q signal of telecommunication of the Y polarization state of the signal-A after obtaining amplifying.
In the embodiment of the invention, by the combination of the amplifier on photodetector and the electric territory has just been formed filter, eliminate the impact of adjacent carrier.
The first electric treatment module specifically comprises, the first analog to digital converter and the first digital signal processor.The first analog to digital converter, the Q signal of telecommunication that is used for the Y polarization state of the I signal of telecommunication of the Y polarization state of the Q signal of telecommunication of the X polarization state of the I signal of telecommunication, the signal-A after amplifying to the X polarization state of the signal-A after amplifying, the signal-A after amplifying, the signal-A after amplifying carries out analog-to-digital conversion, obtains the Q digital signal of Y polarization state of I digital signal, signal-A of Y polarization state of Q digital signal, signal-A of X polarization state of I digital signal, the signal-A of the X polarization state of signal-A.The first digital signal processor, the Q digital signal depolarization of Y polarization state of I digital signal, signal-A of Y polarization state that is used for Q digital signal, the signal-A of the X polarization state of I digital signal, signal-A to the X polarization state of signal-A, and carry out the palarization multiplexing compensation, demodulate the X-polarization state signal of signal-A, the Y-polarization state signal of signal-A.
Further, the first coherent reception electric treatment module also comprises, the first FEEDBACK CONTROL processing module.The first FEEDBACK CONTROL processing module, be used for the result that the Y polarization state signal of X polarization state signal, signal-A according to signal-A is compared with the maximum power value that the first Polarization Controller detects respectively, output feedback control signal PC-A removes to adjust the Polarization Control signal of the signal-A of the first Polarization Controller output.
The X polarization state signal of signal-A, the Y polarization state signal of signal-A are inputted respectively in the first frequency mixer (90 degree frequency mixer 11), the second frequency mixer (90 degree frequency mixer 12) and the first FEEDBACK CONTROL processing module according to certain power proportions.The first FEEDBACK CONTROL processing module is carried out power detection to the signal of input.Because when signal-A only had the incident angle of aiming at the first polarization beam apparatus, the power of each polarization signal of the first polarization beam apparatus (PBS11) output could all reach maximum.The embodiment of the invention is, the angle of controlling the first Polarization Controller (PC1) control incident PBS light signal in the starting stage rotates a circle, find prominent point, then take this maximum power point as reference, be lower than this power and just export the PC-A control signal the first Polarization Controller is adjusted.By the angle of adjustment light signal incident the first Polarization Controller, thus better depolarization.
Further, the embodiment of the invention can also be adjusted the first Polarization Controller (PC1) by the first electric treatment module (DSP1) output PC-A control signal.Principle is similar, and different is, the scheme of the first electric treatment module is to process in electric territory, and the scheme in the first coherent reception module is processed in the light territory.
Fig. 6 is the second coherent reception electric treatment module diagram in the embodiment of the invention.The second coherent reception electric treatment module specifically comprises, the second coherent reception module and the second electric treatment module.The second coherent reception module is used for Polarization Control signal and the SC-2 signal of signal-B are carried out the coherent reception processing, obtains the X polarization state electric signal of signal-B and the Y polarization state electric signal of signal-B.The second electric treatment module is used for the X polarization state electric signal of signal-B and the Y polarization state electric signal of signal-B are carried out electric treatment, obtains the X-polarization state signal of signal-B and the Y-polarization state signal of signal-B.
Further, the second coherent reception module specifically comprises, the first polarization beam apparatus, the one 90 degree frequency mixer, the second polarization beam apparatus, the 2 90 degree frequency mixer, the first photodetector, the second photodetector, the first amplifier, the second amplifier, the 3rd amplifier, the 4th amplifier.
The first polarization beam apparatus, the Polarization Control signal polarization beam splitting that is used for signal-B that the first Polarization Controller is produced is the X polarization state signal of signal-B and the Y polarization state signal of signal-B.The second polarization beam apparatus, being used for the beam splitting of SC-2 signal polarization is the X polarization state signal of SC-2 and the Y polarization state signal of SC-2.The one 90 degree frequency mixer, being used for X polarization state signal with the X polarization state signal of signal-B and SC-2, to carry out mixing relevant, obtains the X polarization state coherent signal of signal-B.The first photodetector is used for the X polarization state coherent signal of signal-B is carried out opto-electronic conversion, obtains the Q signal of telecommunication of the X polarization state of the I signal of telecommunication of X polarization state of signal-B and signal-B.The 2 90 degree frequency mixer, being used for Y polarization state signal with the Y polarization state signal of signal-B and SC-2, to carry out mixing relevant, obtains the Y polarization state coherent signal of signal-B.The second photodetector is used for the Y polarization state coherent signal of signal-B is carried out opto-electronic conversion, obtains the Q signal of telecommunication of the Y polarization state of the I signal of telecommunication of Y polarization state of signal-B and signal-B.
The first amplifier is used for the I signal of telecommunication amplification with the X polarization state of signal-B, the I signal of telecommunication of the X polarization state of the signal-B after obtaining amplifying.The second amplifier is used for the Q signal of telecommunication amplification with the X polarization state of signal-B, the Q signal of telecommunication of the X polarization state of the signal-B after obtaining amplifying.The 3rd amplifier is used for the I signal of telecommunication amplification with the Y polarization state of signal-B, the I signal of telecommunication of the Y polarization state of the signal-B after obtaining amplifying.The 4th amplifier is used for the Q signal of telecommunication amplification with the Y polarization state of signal-B, the Q signal of telecommunication of the Y polarization state of the signal-B after obtaining amplifying.
In the embodiment of the invention, by the combination of the amplifier on photodetector and the electric territory has just been formed filter, eliminate the impact of adjacent carrier.
The second electric treatment module specifically comprises, the second analog to digital converter and the second digital signal processor.The second analog to digital converter, the Q signal of telecommunication that is used for the Y polarization state of the I signal of telecommunication of the Y polarization state of the Q signal of telecommunication of the X polarization state of the I signal of telecommunication, the signal-B after amplifying to the X polarization state of the signal-B after amplifying, the signal-B after amplifying, the signal-B after amplifying carries out analog-to-digital conversion, obtains the Q digital signal of Y polarization state of I digital signal, signal-B of Y polarization state of Q digital signal, signal-B of X polarization state of I digital signal, the signal-B of the X polarization state of signal-B.The second digital signal processor, the Q digital signal depolarization of Y polarization state of I digital signal, signal-B of Y polarization state that is used for Q digital signal, the signal-B of the X polarization state of I digital signal, signal-B to the X polarization state of signal-B, and carry out the palarization multiplexing compensation, demodulate the X-polarization state signal of signal-B, the Y-polarization state signal of signal-B.
Further, the second coherent reception electric treatment module also comprises, the second FEEDBACK CONTROL processing module,
The second FEEDBACK CONTROL processing module, be used for the result that the Y polarization state signal of X polarization state signal, signal-B according to signal-B is compared with the maximum power that the second Polarization Controller detects respectively, output feedback control signal PC-B removes to adjust the Polarization Control signal of the signal-B of the second Polarization Controller output.
The X polarization state signal of signal-B, the Y polarization state signal of signal-A are inputted respectively in the first frequency mixer (90 degree frequency mixer 21), the second frequency mixer (90 degree frequency mixer 22) and the second FEEDBACK CONTROL processing module according to certain power proportions.The second FEEDBACK CONTROL processing module is carried out power detection to the signal of input.Because when signal-B only had the incident angle of aiming at the first polarization beam apparatus, the power of each polarization signal of the first polarization beam apparatus (PBS21) output could all reach maximum.The embodiment of the invention is, the angle of controlling the second Polarization Controller (PC2) control incident PBS light signal in the starting stage rotates a circle, find prominent point, then take this maximum power point as reference, be lower than this power and just export the PC-B control signal the second Polarization Controller is adjusted.The angle of incident the second Polarization Controller by adjusting light signal, thus polarization separated better.
Further, the embodiment of the invention can also be adjusted the second Polarization Controller (PC2) by the second electric treatment module (DSP2) output PC-B control signal.Principle is similar, and different is, the scheme of the second electric treatment module is to process in electric territory, and the scheme in the second coherent reception module is processed in the light territory.
The method of a kind of multi-carrier coherent reception electric treatment that this method implementation column provides comprises,
Isolate signal-A signal and the signal-B signal of single carrier dual-polarization; The signal-A signal is carried out Polarization Control, produce the Polarization Control signal of signal-A; The signal-B signal is carried out Polarization Control, produce the Polarization Control signal of signal-B; Produce with the wavelength of signal-A signal and signal-B signal and distinguish identical two photon carrier wave SC-1 signals and SC-2 signal; Signal-A signal and SC-1 signal are carried out coherent reception electric treatment, obtain the X-polarization state signal of signal-A and the Y-polarization state signal of signal-A; Signal-B signal and SC-2 signal are carried out coherent reception electric treatment, obtain the X-polarization state signal of signal-B and the Y-polarization state signal of signal-B.
Further, produce with the wavelength of signal-A signal and signal-B signal respectively the step of identical two photon carrier wave SC-1 signals and SC-2 signal be specially: generation single-frequency carrier wave light signal; With single-frequency carrier wave optical signal modulation be two with the wavelength of signal-A signal and signal-B signal respectively identical two photon carrier wave SC-1 signals that mix and SC-2 signal; Separate SC-1 signal and SC-2 signal.
Further, signal-A signal and SC-1 signal are carried out coherent reception electric treatment, the step that obtains the Y-polarization state signal of the X-polarization state signal of signal-A and signal-A is specially: signal-A signal and SC-1 signal are carried out coherent reception process, obtain the X polarization state electric signal of signal-A and the Y polarization state electric signal of signal-A; The X polarization state electric signal of signal-A and the Y polarization state electric signal of signal-A are carried out electric treatment, obtain the X-polarization state signal of signal-A, the Y-polarization state signal of signal-A;
Further, signal-B signal and SC-2 signal are carried out coherent reception electric treatment, the step that obtains the Y-polarization state signal of the X-polarization state signal of signal-B and signal-B is specially: signal-B signal and SC-2 signal are carried out coherent reception process, obtain the X polarization state electric signal of signal-B and the Y polarization state electric signal of signal-B; The X polarization state electric signal of signal-B and the Y polarization state electric signal of signal-B are carried out electric treatment, obtain the X-polarization state signal of signal-B and the Y-polarization state signal of signal-B.
Further, signal-A signal and SC-1 signal are carried out coherent reception electric treatment, the step that obtains the Y-polarization state signal of the X-polarization state signal of signal-A and signal-A also comprises: according to the result that the Y polarization state signal of the X polarization state signal of signal-A, signal-A is compared with the maximum power value that detects respectively, output feedback control signal PC-A removes to adjust the Polarization Control signal of signal-A.The performance number that presets is that the angle of controlling the first Polarization Controller (PC1) control incident PBS light signal in the starting stage rotates a circle the maximum power value that obtains.
Further, signal-B signal and SC-2 signal are carried out coherent reception electric treatment, the step that obtains the Y-polarization state signal of the X-polarization state signal of signal-B and signal-B also comprises, according to the result that the Y polarization state signal of the X polarization state signal of signal-B, signal-B is compared with the maximum power value that detects respectively, output feedback control signal PC-B removes to adjust the Polarization Control signal of signal-B.The performance number that presets is that the angle of controlling the second Polarization Controller (PC2) control incident PBS light signal in the starting stage rotates a circle the maximum power value that obtains.
This method implementation column also provides a kind of system of multi-carrier coherent reception electric treatment, comprises, two carrier wave dual-polarization signal generator modules are for generation of the two numbers of believing one side only of two carrier waves (specifically describing in the visible embodiment of the invention description to Fig. 3); Photon carrier separation device is used for from two carrier wave dual-polarization signals, isolates signal-A signal and the signal-B signal of single carrier dual-polarization; The first Polarization Controller is used for the signal-A signal is carried out Polarization Control, produces the Polarization Control signal of signal-A; The second Polarization Controller is used for the signal-B signal is carried out Polarization Control, produces the Polarization Control signal of signal-B; The subcarrier generation module, for generation of with the wavelength of signal-A signal and signal-B signal respectively identical two photon carrier wave SC-1 signals and SC-2 signal; The first coherent reception electric treatment module is used for Polarization Control signal and the SC-1 signal of signal-A are carried out coherent reception electric treatment, obtains the X-polarization state signal of signal-A and the Y-polarization state signal of signal-A; The second coherent reception electric treatment module is used for Polarization Control signal and the SC-2 signal of signal-B are carried out coherent reception electric treatment, obtains the X-polarization state signal of signal-B and the Y-polarization state signal of signal-B.
This shows, in embodiments of the present invention, reduce line speed by increasing number of sub carrier wave, thereby reduce the bandwidth requirement of receiver and the sample rate of ADC, reduce the difficulty of Realization of Product, solve prior art baud rate height when signal coherence receives and caused the demanding problem of ADC chip sample rate, improved the stability of transmission network, be conducive to the realization of product.The polarization state signal is told a part of light by certain power proportions, be input in the FEEDBACK CONTROL processing module, the angle of control Polarization Control signal incident polarization beam splitter PBS, on the light territory, tentatively the signal of X polarization and Y polarization is untied, then further depolarization and PMD compensation in electric territory, thus reached better depolarization.
The contents such as the concrete signal processing of said method step, implementation and since with apparatus of the present invention embodiment based on same conception, can referring to the narration among apparatus of the present invention embodiment, repeat no more herein.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement by hardware, but the former is better execution mode in a lot of situation.Based on such understanding, technical scheme of the present invention is to can embodying with the form of software product in whole or in part that background technology contributes, this computer software product can be stored in the storage medium, such as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
The above; only for the better embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (11)
1. the device of a multi-carrier coherent reception electric treatment is characterized in that, comprise,
Photon carrier separation device is for separating of the signal-A signal that goes out the single carrier dual-polarization and signal-B signal;
The first Polarization Controller is used for described signal-A signal is carried out Polarization Control, produces the Polarization Control signal of signal-A;
The second Polarization Controller is used for described signal-B signal is carried out Polarization Control, produces the Polarization Control signal of signal-B;
The subcarrier generation module, for generation of with the wavelength of described signal-A signal and signal-B signal respectively identical two photon carrier wave SC-1 signals and SC-2 signal;
The first coherent reception electric treatment module is used for Polarization Control signal and the described SC-1 signal of described signal-A are carried out coherent reception electric treatment, obtains the X-polarization state signal of signal-A and the Y-polarization state signal of signal-A;
The second coherent reception electric treatment module is used for Polarization Control signal and the described SC-2 signal of described signal-B are carried out coherent reception electric treatment, obtains the X-polarization state signal of signal-B and the Y-polarization state signal of signal-B.
2. device as claimed in claim 1 is characterized in that,
Described subcarrier generation module specifically comprises, local light source, subcarrier maker and photon carrier separation device;
Described local light source is for generation of single-frequency carrier wave light signal;
Described subcarrier maker, be used for described single-frequency carrier wave optical signal modulation be two with the wavelength of described signal-A signal and signal-B signal respectively identical two photon carrier wave SC-1 signals that mix and SC-2 signal;
Described photon carrier separation device is for separating of described SC-1 signal and SC-2 signal.
3. device as claimed in claim 1 is characterized in that,
Described the first coherent reception electric treatment module specifically comprises, the first coherent reception module and the first electric treatment module;
Described the first coherent reception module is used for Polarization Control signal and the described SC-1 signal of described signal-A are carried out the coherent reception processing, obtains the X polarization state electric signal of signal-A and the Y polarization state electric signal of signal-A;
Described the first electric treatment module is used for the X polarization state electric signal of described signal-A and the Y polarization state electric signal of described signal-A are carried out electric treatment, obtains the X-polarization state signal of signal-A, the Y-polarization state signal of signal-A;
Described the second coherent reception electric treatment module specifically comprises, the second coherent reception module and the second electric treatment module;
Described the second coherent reception module is used for Polarization Control signal and the described SC-2 signal of described signal-B are carried out the coherent reception processing, obtains the X polarization state electric signal of signal-B and the Y polarization state electric signal of signal-B;
Described the second electric treatment module is used for the X polarization state electric signal of described signal-B and the Y polarization state electric signal of described signal-B are carried out electric treatment, obtains the X-polarization state signal of signal-B and the Y-polarization state signal of signal-B.
4. device as claimed in claim 3 is characterized in that,
Described the first coherent reception module specifically comprises, the first polarization beam apparatus, the one 90 degree frequency mixer, the second polarization beam apparatus, the 2 90 degree frequency mixer, the first photodetector, the second photodetector, the first amplifier, the second amplifier, the 3rd amplifier, the 4th amplifier;
Described the first polarization beam apparatus, the Polarization Control signal polarization beam splitting that is used for signal-A that will described the first Polarization Controller generation is the X polarization state signal of signal-A and the Y polarization state signal of signal-A;
Described the second polarization beam apparatus, being used for the beam splitting of described SC-1 signal polarization is the X polarization state signal of SC-1 and the Y polarization state signal of SC-1;
Described the one 90 degree frequency mixer, being used for X polarization state signal with the X polarization state signal of described signal-A and described SC-1, to carry out mixing relevant, obtains the X polarization state coherent signal of signal-A;
Described the first photodetector is used for the X polarization state coherent signal of described signal-A is carried out opto-electronic conversion, obtains the Q signal of telecommunication of the X polarization state of the I signal of telecommunication of X polarization state of signal-A and signal-A;
Described the 2 90 degree frequency mixer, being used for Y polarization state signal with the Y polarization state signal of described signal-A and described SC-1, to carry out mixing relevant, obtains the Y polarization state coherent signal of signal-A;
Described the second photodetector is used for the Y polarization state coherent signal of described signal-A is carried out opto-electronic conversion, obtains the Q signal of telecommunication of the Y polarization state of the I signal of telecommunication of Y polarization state of signal-A and signal-A;
Described the first amplifier is used for the I signal of telecommunication amplification with the X polarization state of described signal-A, the I signal of telecommunication of the X polarization state of the signal-A after obtaining amplifying;
Described the second amplifier is used for the Q signal of telecommunication amplification with the X polarization state of described signal-A, the Q signal of telecommunication of the X polarization state of the signal-A after obtaining amplifying;
Described the 3rd amplifier is used for the I signal of telecommunication amplification with the Y polarization state of described signal-A, the I signal of telecommunication of the Y polarization state of the signal-A after obtaining amplifying;
Described the 4th amplifier is used for the Q signal of telecommunication amplification with the Y polarization state of described signal-A, the Q signal of telecommunication of the Y polarization state of the signal-A after obtaining amplifying;
Described the first electric treatment module specifically comprises, the first analog to digital converter and the first digital signal processor;
Described the first analog to digital converter, the Q signal of telecommunication that is used for the Y polarization state of the I signal of telecommunication of the Y polarization state of the Q signal of telecommunication of the X polarization state of the I signal of telecommunication, the signal-A after amplifying to the X polarization state of the signal-A after amplifying, the signal-A after amplifying, the signal-A after amplifying carries out analog-to-digital conversion, obtains the Q digital signal of Y polarization state of I digital signal, signal-A of Y polarization state of Q digital signal, signal-A of X polarization state of I digital signal, the signal-A of the X polarization state of signal-A;
Described the first digital signal processor, the Q digital signal depolarization of Y polarization state of I digital signal, signal-A of Y polarization state that is used for Q digital signal, the signal-A of the X polarization state of I digital signal, signal-A to the X polarization state of described signal-A, and carry out the palarization multiplexing compensation, demodulate the X-polarization state signal of signal-A, the Y-polarization state signal of signal-A.
5. device as claimed in claim 3 is characterized in that,
Described the second coherent reception module specifically comprises, the first polarization beam apparatus, the one 90 degree frequency mixer, the second polarization beam apparatus, the 2 90 degree frequency mixer, the first photodetector, the second photodetector, the first amplifier, the second amplifier, the 3rd amplifier, the 4th amplifier;
Described the first polarization beam apparatus, the Polarization Control signal polarization beam splitting that is used for signal-B that will described the first Polarization Controller generation is the X polarization state signal of signal-B and the Y polarization state signal of signal-B;
Described the second polarization beam apparatus, being used for the beam splitting of described SC-2 signal polarization is the X polarization state signal of SC-2 and the Y polarization state signal of SC-2;
Described the one 90 degree frequency mixer, being used for X polarization state signal with the X polarization state signal of described signal-B and described SC-2, to carry out mixing relevant, obtains the X polarization state coherent signal of signal-B;
Described the first photodetector is used for the X polarization state coherent signal of described signal-B is carried out opto-electronic conversion, obtains the Q signal of telecommunication of the X polarization state of the I signal of telecommunication of X polarization state of signal-B and signal-B;
Described the 2 90 degree frequency mixer, being used for Y polarization state signal with the Y polarization state signal of described signal-B and described SC-2, to carry out mixing relevant, obtains the Y polarization state coherent signal of signal-B;
Described the second photodetector is used for the Y polarization state coherent signal of described signal-B is carried out opto-electronic conversion, obtains the Q signal of telecommunication of the Y polarization state of the I signal of telecommunication of Y polarization state of signal-B and signal-B;
Described the first amplifier is used for the I signal of telecommunication amplification with the X polarization state of described signal-B, the I signal of telecommunication of the X polarization state of the signal-B after obtaining amplifying;
Described the second amplifier is used for the Q signal of telecommunication amplification with the X polarization state of described signal-B, the Q signal of telecommunication of the X polarization state of the signal-B after obtaining amplifying;
Described the 3rd amplifier is used for the I signal of telecommunication amplification with the Y polarization state of described signal-B, the I signal of telecommunication of the Y polarization state of the signal-B after obtaining amplifying;
Described the 4th amplifier is used for the Q signal of telecommunication amplification with the Y polarization state of described signal-B, the Q signal of telecommunication of the Y polarization state of the signal-B after obtaining amplifying;
Described the second electric treatment module specifically comprises, the second analog to digital converter and the second digital signal processor;
Described the second analog to digital converter, the Q signal of telecommunication that is used for the Y polarization state of the I signal of telecommunication of the Y polarization state of the Q signal of telecommunication of the X polarization state of the I signal of telecommunication, the signal-B after amplifying to the X polarization state of the signal-B after amplifying, the signal-B after amplifying, the signal-B after amplifying carries out analog-to-digital conversion, obtains the Q digital signal of Y polarization state of I digital signal, signal-B of Y polarization state of Q digital signal, signal-B of X polarization state of I digital signal, the signal-B of the X polarization state of signal-B;
Described the second digital signal processor, the Q digital signal depolarization of Y polarization state of I digital signal, signal-B of Y polarization state that is used for Q digital signal, the signal-B of the X polarization state of I digital signal, signal-B to the X polarization state of described signal-B, and carry out the palarization multiplexing compensation, demodulate the X-polarization state signal of signal-B, the Y-polarization state signal of signal-B.
6. device as claimed in claim 4 is characterized in that,
Described the first coherent reception electric treatment module further comprises, the first FEEDBACK CONTROL processing module,
Described the first FEEDBACK CONTROL processing module, be used for the result that compares with the maximum power value that described the first Polarization Controller detects respectively according to the Y polarization state signal of the X polarization state signal of described signal-A, described signal-A, output feedback control signal PC-A removes to adjust the Polarization Control signal of the described signal-A of described the first Polarization Controller output; Described maximum power value is the Polarization Control signal of described signal-A when aiming at the incident angle of described the first polarization beam apparatus, the power of the X polarization state signal of the described signal-A of described the first polarization beam apparatus output and the Y polarization state signal of described signal-A.
7. device as claimed in claim 5 is characterized in that,
Described the second coherent reception electric treatment module further comprises, the second FEEDBACK CONTROL processing module,
Described the second FEEDBACK CONTROL processing module, be used for the result that compares with the maximum power that described the second Polarization Controller detects respectively according to the Y polarization state signal of the X polarization state signal of described signal-B, described signal-B, output feedback control signal PC-B removes to adjust the Polarization Control signal of the described signal-B of described the second Polarization Controller output; Described maximum power value is the Polarization Control signal of described signal-B when aiming at the incident angle of described the first polarization beam apparatus, the power of the X polarization state signal of the described signal-B of described the first polarization beam apparatus output and the Y polarization state signal of described signal-B.
8. the method for a multi-carrier coherent reception electric treatment is characterized in that, comprise,
Isolate signal-A signal and the signal-B signal of single carrier dual-polarization;
Described signal-A signal is carried out Polarization Control, produce the Polarization Control signal of signal-A;
Described signal-B signal is carried out Polarization Control, produce the Polarization Control signal of signal-B;
Produce with the wavelength of described signal-A signal and signal-B signal and distinguish identical two photon carrier wave SC-1 signals and SC-2 signal;
Polarization Control signal and the described SC-1 signal of described signal-A are carried out coherent reception electric treatment, obtain the X-polarization state signal of signal-A and the Y-polarization state signal of signal-A;
Polarization Control signal and the described SC-2 signal of described signal-B are carried out coherent reception electric treatment, obtain the X-polarization state signal of signal-B and the Y-polarization state signal of signal-B.
9. method as claimed in claim 8 is characterized in that, the wavelength of described generation and described signal-A signal and the signal-B signal respectively step of identical two photon carrier wave SC-1 signals and SC-2 signal is specially:
Produce single-frequency carrier wave light signal;
With described single-frequency carrier wave optical signal modulation be two with the wavelength of described signal-A signal and signal-B signal respectively identical two photon carrier wave SC-1 signals that mix and SC-2 signal;
Separate described SC-1 signal and SC-2 signal.
10. method as claimed in claim 8, it is characterized in that, described Polarization Control signal and described SC-1 signal with described signal-A carries out coherent reception electric treatment, and the step that obtains the Y-polarization state signal of the X-polarization state signal of signal-A and signal-A is specially:
Polarization Control signal and the described SC-1 signal of described signal-A are carried out the coherent reception processing, obtain the X polarization state electric signal of signal-A and the Y polarization state electric signal of signal-A;
The X polarization state electric signal of described signal-A and the Y polarization state electric signal of described signal-A are carried out electric treatment, obtain the X-polarization state signal of signal-A, the Y-polarization state signal of signal-A;
Described Polarization Control signal and described SC-2 signal with described signal-B carries out coherent reception electric treatment, and the step that obtains the Y-polarization state signal of the X-polarization state signal of signal-B and signal-B is specially:
Polarization Control signal and the described SC-2 signal of described signal-B are carried out the coherent reception processing, obtain the X polarization state electric signal of signal-B and the Y polarization state electric signal of signal-B;
The X polarization state electric signal of described signal-B and the Y polarization state electric signal of described signal-B are carried out electric treatment, obtain the X-polarization state signal of signal-B and the Y-polarization state signal of signal-B.
11. the system of a multi-carrier coherent reception electric treatment is characterized in that, comprises,
Two carrier wave dual-polarization signal generator modules are for generation of two carrier wave dual-polarization signals;
Photon carrier separation device is used for from described pair of carrier wave dual-polarization signal, isolates signal-A signal and the signal-B signal of single carrier dual-polarization;
The first Polarization Controller is used for described signal-A signal is carried out Polarization Control, produces the Polarization Control signal of signal-A;
The second Polarization Controller is used for described signal-B signal is carried out Polarization Control, produces the Polarization Control signal of signal-B;
The subcarrier generation module, for generation of with the wavelength of described signal-A signal and signal-B signal respectively identical two photon carrier wave SC-1 signals and SC-2 signal;
The first coherent reception electric treatment module is used for Polarization Control signal and the described SC-1 signal of described signal-A are carried out coherent reception electric treatment, obtains the X-polarization state signal of signal-A and the Y-polarization state signal of signal-A;
The second coherent reception electric treatment module is used for Polarization Control signal and the described SC-2 signal of described signal-B are carried out coherent reception electric treatment, obtains the X-polarization state signal of signal-B and the Y-polarization state signal of signal-B.
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| ES2732061T3 (en) | 2011-07-26 | 2019-11-20 | Huawei Tech Co Ltd | Procedure and device for receiving optical signals from multiple carriers |
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| US9281915B2 (en) * | 2013-01-17 | 2016-03-08 | Alcatel Lucent | Optical polarization demultiplexing for a coherent-detection scheme |
| CN103401617A (en) * | 2013-08-01 | 2013-11-20 | 武汉邮电科学研究院 | Optical front-end structure of optical communication multi-carrier receiver and multi-carrier receiving method |
| CN105850051B (en) | 2014-04-30 | 2018-12-07 | 华为技术有限公司 | A kind of receiver |
| CN104767570B (en) * | 2015-03-26 | 2017-10-17 | 华中科技大学 | The unrelated coherent receiver of one kind polarization |
| WO2016165138A1 (en) * | 2015-04-17 | 2016-10-20 | 华为技术有限公司 | Dual-carrier optical signal reception method and receiver |
| CN105635023B (en) * | 2016-01-06 | 2019-03-01 | 北京邮电大学 | For the method for transmitting signals of beat frequency AF panel, equipment and system between signal |
| CN106788765B (en) * | 2016-11-30 | 2019-05-14 | 中国科学院半导体研究所 | Silica-based high speed dual-carrier double light polarization modulator integrated chip |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6917031B1 (en) * | 2004-02-17 | 2005-07-12 | Nortel Networks Limited | Method for quadrature phase angle correction in a coherent receiver of a dual-polarization optical transport system |
| CN101207444A (en) * | 2006-12-15 | 2008-06-25 | 富士通株式会社 | Coherent optical receiver |
| CN101296042A (en) * | 2007-04-27 | 2008-10-29 | 富士通株式会社 | Optical receiver |
-
2008
- 2008-09-27 CN CN2008102165107A patent/CN101686096B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6917031B1 (en) * | 2004-02-17 | 2005-07-12 | Nortel Networks Limited | Method for quadrature phase angle correction in a coherent receiver of a dual-polarization optical transport system |
| CN101207444A (en) * | 2006-12-15 | 2008-06-25 | 富士通株式会社 | Coherent optical receiver |
| CN101296042A (en) * | 2007-04-27 | 2008-10-29 | 富士通株式会社 | Optical receiver |
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