CN109462441A - Based on 90 degree of non-standard DPSK reception devices of optical bridging device compatibility of multi-rate - Google Patents
Based on 90 degree of non-standard DPSK reception devices of optical bridging device compatibility of multi-rate Download PDFInfo
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- CN109462441A CN109462441A CN201910034447.3A CN201910034447A CN109462441A CN 109462441 A CN109462441 A CN 109462441A CN 201910034447 A CN201910034447 A CN 201910034447A CN 109462441 A CN109462441 A CN 109462441A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/612—Coherent receivers for optical signals modulated with a format different from binary or higher-order PSK [X-PSK], e.g. QAM, DPSK, FSK, MSK, ASK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
Abstract
One kind being based on 90 degree of non-standard DPSK reception devices of optical bridging device compatibility of multi-rate, comprising: erbium-doped fiber amplifier (EDFA), 1:1 fiber optic splitter, optical fiber phase shifter, brachium matching optical fiber, 90 degree of optical bridging devices, balanced detector, programmable limiting amplifier, Baseband Receiver chip, programmable gate array (FPGA), digital analog converter, electronics frequency mixer, analog-digital converter, optical fiber phase shifter drives amplifying circuit.Present invention design is simple, the compatible receiver of multiple traffic rates may be implemented, and can guarantee the optimal receptivity of each traffic rate.Multiple traffic rates share optics and electronics, simplify system design, can be substantially reduced system cost and system weight.
Description
Technical field
The present invention relates to free space coherent communications and coherent fiber to communicate, especially a kind of to be based on 90 degree of optical bridging devices
The non-standard DPSK of compatibility of multi-rate (Differential Phase-Shift Keying differential phase-shift keying (DPSK)) reception device.
Background technique
Laser coherence communication, which has many advantages, such as that high sensitivity, communication band are roomy, can carry out dense wave division multipurpose, be optical fiber
The hot technology of communication gradually replaces laser intensity modulation communication on backbone network.Satellite laser communications are also flourishing simultaneously
Development, is generation satellite communication Key Implementation Technology.Laser coherence communication is high with traffic rate, communication distance is remote, confidentiality
The advantages that high, will become the mainstream technology for realizing high speed optical fiber communication and satellite laser communications.The demodulation of coherent laser communication
Mode includes: homodyne coherent demodulation, autodyne DPSK coherent demodulation, the demodulation of internal difference digital coherent.Wherein autodyne DPSK demodulation mode
Compared to homodyne coherent demodulation mode and interpolating digital coherent demodulation mode, implementation complexity and power consumption are lower, while to communication
Wavelength requirement is lower, is a kind of very attractive communication mode.Under satellite optical communication scene, it is desirable to which receiving end can be with
Compatible multiple traffic rates simultaneously.Traditional implementation is mostly that change modulation format or each rate correspond to a set of reception
Machine causes receiver system complicated, weight and the proportional increase of power consumption.
The prior art [1] Chinese patent CN200710143877.6, " DPSK light modulation signal receiving device and method " make
Dpsk signal is demodulated with 180 degree bridge and balanced reciver, the optimum point of control errors is the maximum value of error signal, unfavorable
In raising control bandwidth.A kind of " the demodulator phase lock in DPSK receiver of the prior art [2] Chinese patent 200910163008.9
Fixed device and method " equally realize the phase controlling of demodulator using 180 degree bridge and the method for temperature-compensating, still
The mode low-response of temperature control is not suitable for the faster scene of phase change.The prior art [3] European patent EP 1164761A2
" DPSK system with varible data rates " has selected to realize that multi tate DPSK is solved by way of common optical pathways
It adjusts, electronics are the modes of multi channel selecting filter, and in terms of sharing interfere arm, arm length difference is selected as highest communication rate
The corresponding light path of bit period, traffic rate is backward compatible.The prior art [4] CN106716873A " lossless multi tate optical transport
And receive " change efficient communication rate by changing the coding mode of error correcting code, but actual transmission and received symbol rate are not
Become, it is desirable that transmitting terminal transmitting code rate is fixed.The prior art [5] CN101213775B " DPSK modulation-demodulation method and use the party
The optical communication equipment and system of method " realizes the compatibility of multiple rates, traffic rate by being time-multiplexed with the method for wavelength-division multiplex
It can only be 2 times of minimum speed limit, 4 times, 8 times, 16 times, structure is more complex.
Study a kind of simple and reliable compatibility of multi-rate coherent communication demodulating equipment, for reduce communication system complexity,
System power dissipation and load weight are reduced, realizes that the miniaturization of satellite laser communications load is significant.
Summary of the invention
The present invention proposes a kind of based on 90 degree of optical bridgings for the communication of free space laser coherence and coherent fiber communication
The non-standard DPSK reception device of device compatibility of multi-rate, compatible multiple traffic rates, and improve the reception under each traffic rate
Performance.
Technical solution of the invention is as follows:
One kind being based on 90 degree of non-standard DPSK reception devices of optical bridging device compatibility of multi-rate, comprising: EDFA, fiber beam splitting
Device, brachium match optical fiber, optical fiber phase shifter, 90 degree of optical bridging devices, the road I balanced detector, the road Q balanced detector, electronics
Frequency mixer, analog-digital converter, FPGA, digital analog converter, optical fiber phase shifter drives circuit, programmable limiting amplifier, base band letter
Number receive chip；
The output port of the EDFA is connected with the input port of the fiber optic splitter, the fiber optic splitter
First output port is connected with the input port of the described brachium matching optical fiber, the output port of the brachium matching optical fiber and
The first input port of 90 degree of optical bridging devices is connected, the fiber optic splitter second output terminal mouth and the light
The input port of fine phase shifter is connected, and the second of the output port of the optical fiber phase shifter and 90 degree of optical bridging devices
Input port is connected, the input port of the road the I output port of 90 degree of optical bridging devices and the road the I balanced detector
It is connected, the road the Q output port of the bridge is connected with the input port of the road the Q balanced detector, and the road I, which balances, to be visited
The first output port for surveying device is connected with the electronics first mixer input mouth, the road the Q balanced detector
Output port is connected with the electronics second mixer input mouth, the output port of the electronics frequency mixer and institute
The analog-digital converter input port stated is connected, the analog-digital converter output pin and FPGA the first input pin phase
Even, first output pin of FPGA is connected with the digital analog converter input pin, the digital analog converter output
Port is connected with the input port of the optical fiber phase shifter drives circuit, the output end of the optical fiber phase shifter drives circuit
Mouth is connected with the driving input port of the optical fiber phase shifter, the second output terminal mouth of the road the I balanced detector and institute
The first input port of the programmable limiting amplifier stated is connected, the output port of the programmable limiting amplifier with it is described
Baseband signal receive the input port of chip and be connected, the baseband signal receives the output pin and the FPGA of chip
Second input pin is connected, the programming Control pin of second output pin of FPGA and the programmable limiting amplifier
It is connected.
Working principle of the present invention and signal output are analyzed as follows:
If minimum communication code rate are as follows: Bb, then system communication rate can be compatible with Bb、2*Bb、3*Bb、4*Bb、5*BbDeng.Time delay
Means suitable: time delay arm light path is T smaller than phase displacement arm light pathb*C。Tb=1/Bb, C is the light velocity.
The electric field of signal light can indicate are as follows:PSFor the signal light function received
Rate, w are signal light angular frequency, and m (t) is the modulation code of t moment, and value is 0 or 1,For signal light initial phase.
It can be indicated by the electric field that delayer reaches bridge entrance 1 are as follows:
It can be indicated by the electric field that phase shifter reaches bridge entrance 2 are as follows:
It is one arm of delayer due to time delay, signal light frequency variation and the accumulation of optical fiber change in optical path length
Phase difference,It is that the phase introduced when control signal is added in optical fiber phase shifter.
4 road output port photoelectricity field signals of 90 degree of bridges are as follows:
Corresponding current signal are as follows:
For dpsk signal, m (t)=0 or 1, then [m (t+Tb)-m (t)] π=0 or ± π.Multiplier output
Signal can be rewritten are as follows:
The feedback control procedures of FPGA can guarantee:Or π.
The signal on the road I becomes at this time:
Or
Therefore during PGC demodulation, the road I signal, which is equivalent to, has been m (t) and m (t+Tb) exclusive or or with or operation.
It is B for communication speedbSignal m (t) and m (t+Tb) it is adjacent two signals.
It is 2*B for communication speedbSignal m (t) and m (t+Tb) it is 1 signal in interval.
It is 3*B for communication speedbSignal m (t) and m (t+Tb) it is 2 signals in interval.
It is 4*B for communication speedbSignal m (t) and m (t+Tb) it is 3 signals in interval.
For transmitting terminal, corresponding differential encoding is carried out,
Communication speed is 1*BbSignal
Communication speed is 2*BbSignal
Communication speed is 3*BbSignal
Communication speed is 4*BbSignal
By the rule of XOR operation it is found that ck=ak。
In summary: existing in PGC demodulationWhen ck=ak, both sliced output signal was exactly that transmitting terminal needs
The communications codes to be transmitted.Exist in PGC demodulationWhen ck=~ak,.PGC demodulation is highly stable, Ke Yibao
The case where card is not in 0, π reversion.
In switching rate, FPGA can control the input bandwidth of clipping chip, select the optimal reception band of corresponding speed
Width guarantees the optimal receptivity under each rate.
Compared with the prior art, the advantages of the present invention are as follows:
1, different communication rate shares optics and electronics device, and system is simple, low in energy consumption, light-weight, small in size.
2, it is directed to different communication rate, can guarantee each traffic rate by the bandwidth that FPGA controls limiting amplifier
Optimal receptivity.
3, in such a way that FPGA control optical fiber phase shifter realizes phase controlling, phase locked state can be carried out simultaneously real-time
Monitoring, losing lock can be detected automatically and be relocked, and ensure that the reliability of locking phase.
4, digital control algorithm of the invention and coherent reception signal are used completes with a piece of fpga chip, circuit design letter
It is single, it is low in energy consumption, do not need complicated Heat Treatment Analysis.
Detailed description of the invention
Fig. 1 is that the present invention is based on the structural block diagrams of 90 degree of non-standard DPSK reception devices of optical bridging device compatibility of multi-rate.
Specific embodiment
Below with reference to embodiment and attached drawing, the invention will be further described, but protection model of the invention should not be limited with this
It encloses.
Fig. 1 is that the present invention is based on the structural block diagrams of 90 degree of non-standard DPSK reception devices of optical bridging device compatibility of multi-rate.
As seen from the figure, the present invention is based on 90 degree of non-standard DPSK reception devices of optical bridging device compatibility of multi-rate, comprising: EDFA1, optical fiber
Beam splitter 2, brachium match optical fiber 3,4,90 degree of optical bridging devices 5 of optical fiber phase shifter, the road I balanced detector 6, the road Q balance detection
Device 7, analog-digital converter 9, FPGA10, digital analog converter 11, optical fiber phase shifter drives circuit 12, may be programmed electronics frequency mixer 8
Limiting amplifier 13, baseband signal receive chip 14；
The output port of the EDFA1 is connected with the input port of the fiber optic splitter 2, the fiber beam splitting
2 first output port of device is connected with the input port of the brachium matching optical fiber 3, the output of the brachium matching optical fiber 3
Port is connected with the first input port of 90 degree of optical bridging devices 5, the 2 second output terminal mouth of fiber optic splitter with
The input port of the optical fiber phase shifter 4 is connected, the output port of the optical fiber phase shifter 4 and 90 degree of optics bridges
The second input port for connecing device 5 is connected, the road the I output port of 90 degree of optical bridging devices 5 and the road the I balance detection
The input port of device 6 is connected, and the road the Q output port of the bridge is connected with the input port of the road the Q balanced detector 7,
First output port of the road the I balanced detector 6 is connected with 8 first input port of electronics frequency mixer, described
The output port of the road Q balanced detector 7 be connected with 8 second input port of electronics frequency mixer, the electronics
The output port of frequency mixer 8 is connected with 9 input port of analog-digital converter, 9 output pin of analog-digital converter with
First input pin of FPGA10 is connected, and first output pin of FPGA10 and the digital analog converter 11 input
Pin is connected, the input port phase of 11 output port of digital analog converter and the optical fiber phase shifter drives circuit 12
Even, the output port of the optical fiber phase shifter drives circuit 12 is connected with the driving input port of the optical fiber phase shifter 4,
The first input port phase of the second output terminal mouth and the programmable limiting amplifier 13 of the road the I balanced detector 6
Even, the output port of the programmable limiting amplifier 13 receives the input port phase of chip 14 with the baseband signal
Even, the output pin that the baseband signal receives chip 14 is connected with second input pin of FPGA10, described
The second output pin of FPGA10 is connected with the programming Control pin of the programmable limiting amplifier 13.
Claims (8)
1. one kind is based on 90 degree of non-standard DPSK reception devices of optical bridging device compatibility of multi-rate, it is characterized in that its composition includes:
EDFA (1), fiber optic splitter (2), brachium matching optical fiber (3), optical fiber phase shifter (4), 90 degree of optical bridging devices (5), the road I balance
Detector (6), the road Q balanced detector (7), electronics frequency mixer (8), analog-digital converter (9), FPGA (10), digital analog converter
(11), optical fiber phase shifter drives circuit (12), programmable limiting amplifier (13) and baseband signal receive chip (14)；
The output port of the EDFA (1) is connected with the input port of the fiber optic splitter (2), the fiber beam splitting
(2) first output port of device is connected with the input port of brachium matching optical fiber (3), and the brachium matches optical fiber (3)
Output port be connected with the first input port of 90 degree of optical bridging devices (5), the fiber optic splitter (2) second
Output port is connected with the input port of the optical fiber phase shifter (4), the output port of the optical fiber phase shifter (4) and institute
Second input port of the 90 degree of optical bridging devices (5) stated is connected, the road the I output port of 90 degree of optical bridging devices (5)
Be connected with the input port of the road the I balanced detector (6), the road the Q output port of 90 degree of optical bridging devices (5) with it is described
The input port of the road Q balanced detector (7) be connected, the first output port of the road the I balanced detector (6) and described
Electronics frequency mixer (8) first input port is connected, the output port of the road the Q balanced detector (7) and the electronics
It learns (8) second input port of frequency mixer to be connected, the output port of the electronics frequency mixer (8) and the analog-digital converter
(9) input port is connected, and analog-digital converter (9) output pin is connected with (10) first input pin of FPGA,
(10) first output pin of FPGA is connected with described digital analog converter (11) input pin, the digital analog converter
(11) output port is connected with the input port of the optical fiber phase shifter drives circuit (12), the optical fiber phase shifter drives
The output port of circuit (12) is connected with the driving input port of the optical fiber phase shifter (4), the road the I balanced detector
(6) second output terminal mouth is connected with the first input port of the programmable limiting amplifier (13), and described is programmable
The output port of limiting amplifier (13) is connected with the input port that the baseband signal receives chip (14), the base band
The output pin of signal receiving chip (14) is connected with (10) second input pin of FPGA, the FPGA (10) second
Output pin is connected with the programming Control pin of the programmable limiting amplifier (13).
2. according to claim 1 be based on 90 degree of non-standard DPSK reception devices of optical bridging device compatibility of multi-rate, spy
Sign is that brachium matching optical fiber (3) can be shared with multiple traffic rates, does not need to gate.
3. according to claim 1 be based on 90 degree of non-standard DPSK reception devices of optical bridging device compatibility of multi-rate, spy
Sign is that the brachium matches optical fiber (3) and optical fiber phase shifter (4) two-way optical path difference are as follows: minimum traffic rate BbIt is single logical
Believe bit-time multiplied by the light velocity.
4. 90 degree of optical bridging device compatibility of multi-rate non-standard DPSK according to claim 1 to 3 that is based on receives dress
It sets, which is characterized in that when traffic rate is n times of minimum traffic rate, the differential encoding requirement of corresponding transmitting terminal
Are as follows:
Wherein akTo need k-th of the communications codes sent, bk+nFor k-th of communications codes after differential encoding.N is practical communication rate
With the multiple of the minimum traffic rate of default.
5. 90 degree of optical bridging device compatibility of multi-rate non-standard DPSK according to claim 1 to 3 that is based on receives dress
It sets, which is characterized in that the input bandwidth that programmable limiting amplifier (13) are controlled by FPGA (10) guarantees each traffic rate
Optimal reception.
6. 90 degree of optical bridging device compatibility of multi-rate non-standard DPSK according to claim 1 to 3 that is based on receives dress
It sets, which is characterized in that control piezoelectric type optical fiber phase shifter (4) by FPGA (10), realize PGC demodulation.
7. 90 degree of optical bridging device compatibility of multi-rate non-standard DPSK according to claim 1 to 3 that is based on receives dress
It sets, which is characterized in that piezoelectric type optical fiber phase-shifter responsive bandwidth can achieve tens Khz, and PGC demodulation closed-loop bandwidth is high, locking phase
Error to standard deviation can control within 4 degree.
8. 90 degree of optical bridging device compatibility of multi-rate non-standard DPSK according to claim 1 to 3 that is based on receives dress
It sets, which is characterized in that be mixed to obtain locking phase error signal, locking phase error letter by 90 degree of bridges and orthogonal IQ two paths of signals
It is number proportional to phase error.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110445549A (en) * | 2019-07-19 | 2019-11-12 | 中国科学院上海光学精密机械研究所 | Single wavelength 40Gbps PM-QPSK demodulating equipment based on optical phase-locked loop and optical fiber phase shifter |
| CN111147072A (en) * | 2020-01-14 | 2020-05-12 | 长春理工大学 | High-precision frequency and phase discrimination method and system in homodyne coherent detection unit |
| CN111385031A (en) * | 2020-03-24 | 2020-07-07 | 中国科学院上海光学精密机械研究所 | Inter-satellite coherent optical communication system based on composite axis phase locking |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111385031A (en) * | 2020-03-24 | 2020-07-07 | 中国科学院上海光学精密机械研究所 | Inter-satellite coherent optical communication system based on composite axis phase locking |
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