CN103107853B - Photo-communication system based on digital coherent receiver and handling method of output signal - Google Patents
Photo-communication system based on digital coherent receiver and handling method of output signal Download PDFInfo
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Abstract
The invention discloses a photo-communication system based on a digital coherent receiver. The photo-communication system based on the digital coherent receiver comprises a laser transmitting module. Laser which is emitted by the laser transmitting module is connected with a signal input end of an optical signal filtering module through an optical signal modeling and delaying processing module. A signal output end of a filtering module is connected with a signal input end of an optical signal processing module through an optical fiber link. A signal output end of the optical signal processing module is connected with a signal input end of an integrated coherent machine receiving module. A signal output end of a local optical signal production module is connected with a local signal input end of the integrated coherent machine receiving module. The invention further provides a handling method of an output signal of the photo-communication system. The photo-communication system based on the digital coherent receiver has the advantages of being simple in structure, free from optical clock recovery, capable of using a asynchronous pulse local oscillator and capable of automatically conducting polarization compensation and polarization mode compensation, achieves high-speed transmission of signals, reduces electron loss and meanwhile guarantees precision of sampling signals. The photo-communication system based on the digital coherent receiver is suitable for an Ethernet system with a bit rate of 400 giga-bit per second (Gbps) and utilizes a photo-communication system with a 20 Hertz broadband and a 50-Herz sampling rate.
Description
Technical field
The invention belongs to optical communication field, specifically a kind of based on the optical communication system of digital coherent receiver and the processing method of output signal.
Background technology
At present, in optical communication field, usually utilizing digital coherent receiver as optical acquisition device, recover digital carrier phase place by means of palarization multiplexing and Quadrature Phase Shift Keying, with this for reducing the loss of electronics, thus realizing the high-speed transfer of Ethernet.But, due to scientific and technological development, the transmission rate of Ethernet is also improving constantly, and the bit rate of current Ethernet transmission reaches 400Gdps, existing digital coherent receiver can not adopt bandwidth 20GHz, and sample rate is the electrical analogue-digital quantizer (ADC) of 50GHz.In order to solve the above problems, researcher's proposition relaxes the requirement to electric mould-digital quantizer by the number of coded bits increasing each output symbol, but the method significantly can reduce the resistance ability of optical communication system to amplified spontaneous emission noise and nonlinear impairments.
Meanwhile, in coherent receiver, the optical time division multiplex signal of reception reduces requirement to ADC sample rate by using pulse local oscillator.For making coherent light multiplexed accurately consistent with the Received signal strength of pulse local oscillator on receiver, must optical clock recovery be set, the effect of optical clock recovery is the distorted signals received because dispersion and polarization mode dispersion cause, once these dispersions are excessive, optical clock recovery will lose efficacy, therefore, these losses must be compensated before clock recovery performs.Like this, digital coherent receiver just cannot embody the advantage can alleviating electrical losses.In addition, the pulse recurrence rate of existing local oscillator is 10MHz, the real-time detection of high-speed optical signal cannot be met, although propose now the method for sampling (namely utilizing the unit time delay of two directional light samplings at their sampling instant to measure the differential phase figure of differential phase keying (DPSK) signal) of directional light, but, the pulse recurrence rate of local oscillator now remains 10MHz, cannot meet the real-time detection of high-speed optical signal.
Summary of the invention
The technical problem to be solved in the present invention, be to provide a kind of optical communication system based on digital coherent receiver, this system does not need optical clock recovery, and can use the asynchronous local oscillator of free-running operation, effectively can reduce electrical losses when the optical signal transmission of the long distance of high speed; Meanwhile, another object of the present invention, is to provide a kind of processing method of the output signal based on this optical communication system.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
1. a kind of optical communication system based on digital coherent receiver
Based on an optical communication system for digital coherent receiver, comprising the emitter for sending light, sending the receiving system of light for receiving reflector, described emitter is by optical fiber link and receiving system wireless connections;
Described emitter comprises laser emitting module, optical signal modulation delay process module, optical signal filtering module, and the laser that wherein laser emitting module is launched passes through the signal input part of optical signal modulation delay process model calling optical signal filtering module;
Described laser emitting module adopts external cavity laser;
Described optical signal modulation delay process module comprises electroabsorption modulator, I/Q modulator and fiber delay time multiplexer, the signal input part of described electroabsorption modulator receives the light of external cavity laser transmitting, and signal output part is by the signal input part of I/Q modulator connecting fiber time delayed multiplexer;
Described optical fiber link comprises two standard single-mode fibers, the Erbium-Doped Fiber Amplifier equal with standard single-mode fiber quantity.The signal input part of described Erbium-Doped Fiber Amplifier connects the signal output part of optical signal filtering module, is connected with a standard single-mode fiber between two adjacent Erbium-Doped Fiber Amplifier;
Described receiving system comprises optical signal prosessing module, local optical signal generation module and the integrated relevant machine receiver module that the light signal for coming optical fiber link transmission processes, the signal output part of the signal input part connecting fiber link of described optical signal prosessing module, signal output part connects the signal input part of integrated relevant machine receiver module, and the signal output part of local optical signal generation module connects the local signal input of integrated relevant machine receiver module;
Described optical signal prosessing module comprises variable optical attenuator, preamplifier, receiving terminal optical band pass filter and receiving terminal Erbium-Doped Fiber Amplifier, the signal output part of the signal input part connecting fiber link of described variable optical attenuator, signal output part connects the signal input part of Erbium-Doped Fiber Amplifier successively by preamplifier, receiving terminal optical band pass filter;
It also comprises display processing unit light signal being carried out to Graphics Processing, and the signal input part of described display processing unit connects the signal output part of integrated relevant machine receiver module; Described display processing unit comprises digital fluorescence oscilloscope and signal is carried out to the processed off-line device of processed off-line, the signal input part of described digital fluorescence oscilloscope connects integrated relevant machine receiver module by linear amplifier, and signal output part connects processed off-line device.
Limit as to another kind of the present invention:
Filtration module adopts optical band pass filter, the signal output part of the signal input part connecting fiber time delayed multiplexer of described optical band pass filter.
As limitation of the invention further: local optical signal generation module comprises local generating laser, local electroabsorption modulator and local optical band pass filter, the signal input part of described local electroabsorption modulator receives the light that local generating laser sends, and signal output part connects the signal input part of local optical band pass filter;
Integrated relevant machine receiver module comprises four 90 ° of polarization mixing devices, and the output of each 90 ° of polarization mixing devices is respectively by the input of four detector connecting linear amplifiers.
2. the processing method that the optical communication system based on digital coherent receiver outputs signal is planted
Present invention also offers a kind of processing method of the above-mentioned output signal of the optical communication system based on digital coherent receiver, comprise the following steps:
(1) correction of light front end is carried out to the signal that digital fluorescence oscilloscope exports;
(2) timing off-set between compensating digits fluorescence oscilloscope channel, comprises the following steps:
(21) inner dispersion compensation;
(22) local oscillator clock recovery;
(23) down-sampling;
(24) phase offset compensation;
(25) intersect orthogonal;
(3) compensating digits fluorescence oscilloscope obtains the time difference of sample, comprises the following steps:
(31) outside dispersion compensation;
(32) intersect orthogonal;
(33) dispersion compensation;
(34) fixing equalization filter;
(35) signal clock recovers;
(36) frequency offset compensation;
(37) down-sampling;
(38) carrier phase recovery;
(39) error count.
Owing to have employed above-mentioned technical scheme, compared with prior art, acquired technological progress is in the present invention:
(1) optical signal modulation delay process module, the filtration module of the present invention by arranging in emitter, and the optical signal prosessing module arranged in receiving system processes light signal, can overcome the restriction of electrical analogue-digital quantizer to speed, realizing sample frequency is 112GHz;
(2) adopt Erbium-Doped Fiber Amplifier and the spaced form of standard single-mode fiber in optical fiber link, make system and device in the standard single-mode fiber more than 610 kilometers, transmit 56GBd Quadrature Phase Shift Keying signal, and electrical losses be very little;
(3) transmit the mono-polarization signal of 32GBd and 64GBd multiplexing polarization QPSK signal, without the need to optical dispersion compensation, and native system automatically can carry out polarization compensation and polarization mode compensates;
(4) the present invention can carry out subsequent treatment to signal, therefore in system without the need to optical clock recovery, and the asynchronous pulse local oscillator of free-running operation can be used;
(5) the present invention adopts processed off-line to the process of coherent reception machine data, can compensate, filtering process to data, improves the precision of system.
As fully visible, structure of the present invention simple, without the need to optical clock recovery, the asynchronous pulse local oscillator of free-running operation can be used, and automatically can carry out polarization compensation and polarization mode compensation, realize the high-speed transfer of signal, and reduce electrical losses, ensure the accuracy of sampled signal.
The present invention is applicable in the Ethernet system that bit rate is 400Gbps, and employing bandwidth is 20GHz, and sample rate is the optical communication system of 50 GHz.
The present invention is described in further detail below in conjunction with Figure of description and specific embodiment.
Accompanying drawing explanation
Fig. 1 is the structural representation in the embodiment of the present invention;
Fig. 2 is the flow chart of the signal processed off-line of the embodiment of the present invention.
In Fig. 1: 1-emitter, 11-laser emitting module, 12-optical signal modulation delay process module, 13-filtration module, 2-optical fiber link, 21-Erbium-Doped Fiber Amplifier, 22-standard single-mode fiber, 3-receiver module, 31-optical signal prosessing module, 32-local signal generation module, 33-integrated relevant machine receiver module, 4-display processing unit, 41-processed off-line device.
Embodiment
embodimenta kind of based on the optical communication system of digital coherent receiver and the processing method of output signal thereof
One, a kind of optical communication system based on digital coherent receiver
Figure 1 shows that the structural representation of the optical communication system based on digital coherent receiver of the present embodiment, comprising:
1. the emitter 1 be made up of laser emitting module 11, optical signal modulation delay process module 12 and filtration module 13, wherein laser emitting module 11 adopts external cavity laser ECL.
Optical signal modulation delay process module comprises electroabsorption modulator EAM, I/Q modulator MOD and postpones multiplexer MUX, wherein the signal input part of electroabsorption modulator EAM receives the light signal that external cavity laser ECL sends, and signal output part postpones the signal input part of multiplexer MUX by I/Q modulator MOD connecting fiber.Wherein, the generation of the modulation signal of I/Q modulator MOD is
pseudo-random binary sequence realize, in order to the uncorrelated sequence of elimination, BPG export radix-minus-one complement about postpone 1.4ns.
Filtration module adopts receiving terminal optical band pass filter U1.
2. the optical fiber link 2 be made up of seven Erbium-Doped Fiber Amplifier 21 and seven standard single-mode fibers 22, wherein, the input of first Erbium-Doped Fiber Amplifier 21 connects the signal output part of filtration module 13 in emitter as the signal input part of optical fiber link, output connects the input of second Erbium-Doped Fiber Amplifier 21 by first standard single-mode fiber 22, the output of second Erbium-Doped Fiber Amplifier 21 connects the input of the 3rd Erbium-Doped Fiber Amplifier 21 by second standard single-mode fiber 22, the output of the 3rd Erbium-Doped Fiber Amplifier 21 connects the input of the 4th Erbium-Doped Fiber Amplifier 21 by the 3rd standard single-mode fiber 22,4th output closing Erbium-Doped Fiber Amplifier 21 connects the input of the 5th Erbium-Doped Fiber Amplifier 21 by the 4th standard single-mode fiber 22, the output of the 5th Erbium-Doped Fiber Amplifier 21 connects the input of the 6th Erbium-Doped Fiber Amplifier 21 by the 5th standard single-mode fiber 22, the output of the 6th Erbium-Doped Fiber Amplifier 21 connects the input of the 7th Erbium-Doped Fiber Amplifier 21 by the 6th standard single-mode fiber 22, the output of the 7th Erbium-Doped Fiber Amplifier 21 is outputed signal by the 7th standard single-mode fiber 22.
3. the receiving system 3 be made up of optical signal prosessing module 31, local optical signal generation module 32, integrated relevant machine receiver module 33.Wherein optical signal prosessing module 31 comprises variable optical attenuator VOA, preamplifier UA, receiving terminal optical band pass filter U2 and receiving terminal Erbium-Doped Fiber Amplifier EDFA1.The wherein signal output part of the signal input part connecting fiber link 2 of variable optical attenuator VOA, signal output part connects the signal input part of receiving terminal optical band pass filter U2 by preamplifier UA, and the signal output part of receiving terminal optical band pass filter U2 connects the signal input part of receiving terminal Erbium-Doped Fiber Amplifier EDFA1.
Local optical signal generation module 32 comprises local generating laser ECL1, local Electron absorption modulator EAM1 and local Erbium-Doped Fiber Amplifier EDFA2, wherein the signal input part of local Electron absorption modulator EAM1 receives the light that local generating laser ECL1 sends, and signal output part connects the signal input part of local Erbium-Doped Fiber Amplifier.
Integrated relevant machine receiver module 33 adopts integrated relevant machine module CPRV1010A module, comprise the polarization mixing device U3 of two 90 °, the output of each 90 ° of polarization mixing device U3 is all by the signal input part of detector D1 connecting linear amplifier U1A, and the output of linear amplifier U1A is as the output of integrated coherent receiver module 33.The Optical Sampling rate of above-mentioned integrated coherent receiver module 33 is 60GHz, and each 90 ° of polarization mixing device U3 are connected with two linear amplifier U1A, and are serially connected with two detector D1 between each 90 ° of polarization mixing devices and each linear amplifier U1A.
4. the display processing unit 4 be made up of digital fluorescence oscilloscope (DPO) DPO and processed off-line device 41, signal for receiving integrated coherent receiver module shows, and carry out processed off-line, wherein the signal input part of digital fluorescence oscilloscope (DPO) DOP connects the signal output part of integrated coherent receiver module 33, and signal output part connects the signal input part of processed off-line device 41.
As the expansion to the present embodiment, integrated relevant machine receiver module 33 can be expanded to the module that Optical Sampling rate is 112GHz, this needs by two CPRV1010A module integrations together, namely four 90 ° of polarization mixing devices, eight linear amplifier U1A and 16 detector D1 are comprised, its connected mode is identical with the present embodiment, adopts two corresponding digital fluorescence oscilloscope (DPO) DPO simultaneously.
During specific works, external cavity laser ECL Emission Lasers, the laser signal launched is first through receiving terminal electroabsorption modulator EAM, wherein the live width of external cavity laser ECL is 100KHz, can launch the continuous light wave of 1550nm, and half maximum overall with of the pulse of the electroabsorption modulator EAM of receiving terminal is about 10ps.Enter into I/Q modulator MOD after optical signals receiving terminal electroabsorption modulator EAM sends to modulate, I/Q modulator MOD adopts FTM7960EX, driven push-pull fashion formed by two Mach-Zeng Deer modulator employing pair, adopt homophase and the quadrature component separate modulation of electric field, the generation of its modulation signal is
pseudo-random binary sequence realize, in order to the uncorrelated sequence of elimination, BPG export radix-minus-one complement about postpone 1.4ns.Afterwards, light signal enters in optical fiber delay multiplexer MUX, and optical fiber delay multiplexer MUX can produce single polarization signal and the alternate polarization signal staggered with light signal.Finally, light signal by bandwidth be 3dB, frequency is launch to optical fiber link 2. after the receiving terminal optical band pass filter U1 of 70GHz carries out filtering
Light signal arrives receiving system 3 place through the transmission of optical fiber link 2, first by variable optical attenuator VOA receiving optical signals, and light signal is passed to preamplifier UA, by variable optical attenuator VOA and preamplifier UA, the adjustment of Optical Signal To Noise Ratio is carried out to light signal.Optical signals 1nm receiving terminal optical band pass filter U2 after adjustment carries out filtering, exports to integrated relevant machine receiver module 33 after then amplifying via receiving terminal Erbium-Doped Fiber Amplifier EDFA1.Meanwhile, the local generating laser ECL1 in local optical signal generation module 32 sends light, and is modulated by local electroabsorption modulator EAM1, sends integrated coherent receiver module 33 to after then amplifying via local Erbium-Doped Fiber Amplifier EDFA2.The light signal received sends to after digital fluorescence oscilloscope (DPO) DPO shows by integrated coherent receiver module 33, flows to the processed off-line that processed off-line device 41 carries out signal.
In said process, if integrated coherent receiver module 33 adopts be the receiver module of 64GHz, then the light signal that the light signal sent produces with this locality can be divided into two by three-dB coupler, and wherein, the repetition rate of local optical signal is R
lO=32GHz, inserts T in low local optical signal
lOthe time delay of/2, to guarantee the equidistant sampling in time domain, and then sends all branch signals to integrated coherent receiver module 33.
The receiver module of what if integrated relevant machine receiver module 33 adopted be 112GHz, then the light signal of the light signal sent and local generation can be divided into four branches, and wherein, the repetition rate of local optical signal is R
lO=28GHz, in order to ensure the equidistant sampling of light signal, adds 0.5TLO respectively, the light delay of 0.25TLO and 0.75TLO in three branches of four local optical signals.Form four thus and postpone optical sampler, wherein each sample rate is 28GHz, and combination produces the sample rate of 112GHz.In this case, two digital fluorescence oscilloscope (DPO) DPO are used for the electric analog-to-digital conversion of the output voltage of 2 integrated coherent receiver modules 33.The power output of local Erbium-Doped Fiber Amplifier EDFA2 is adjusted to and produces the signal power of-7dBm and the local optical signal power of 3dBm at the input of 90 ° of mixed lights.The light received reserves the polarization state of signal and local optical signal and manual Polarization Controller matches.
Two, a kind of processing method of output signal of the optical communication system based on digital coherent receiver
The processing method of the output signal of the above-mentioned optical communication system based on digital coherent receiver of the present embodiment is as follows:
Shown in Fig. 2 is the flow chart of signal processed off-line, and the present embodiment adopts TMSC3206455 to be the process that the process chip of core realizes high-speed digital signal, adopts FLASH memory simultaneously, ensures the processed off-line of dsp chip.The processing method of this digital signal, mainly for the integrated coherent receiver module 33 adopting frequency to be 112GHz, comprises the following steps:
(1) rectification of light front end is carried out to the signal that digital fluorescence oscilloscope (DPO) exports: the signal due to input includes the complex samples I that two digital fluorescence oscilloscope DPO obtain
n+ jQ
nfirst four sequences of (n ∈ ﹛ 1,2,3,4 ﹜), therefore carry out the rectification of light front end, and the present embodiment adopts the orthogonal step of Ge Lamu-Schmidt to make up the orthogonal unbalance of any 90 ° of mixed lights.
(2) timing off-set between compensating digits fluorescence oscilloscope (DPO) channel: due to the phase-unstable of 90 ° of mixed light supply fiber optic networks, so the relative phase in four branches between light signal and local optical signal offsets in time, the present embodiment takes the integreted phontonics solution of a smart phase track algorithm and the feeding network based on 4 90 ° of mixed lights and photodiode, and adopts track algorithm to compensate single phase deviation.Local optical signal clock recovery simultaneously allows sample rate to be S
r=R
lOreduced sampling, this step is by the signal I of 4 tunnel orthogonal transforms
n+ jQ
n(n ∈ ﹛ 1,2,3,4 ﹜) is transformed to two-way and exports I
dPOn+ jQ
dPOn(n ∈ ﹛ 1,2 ﹜).Specifically comprise the following steps:
(21) inner dispersion compensation: superposition negative dispersion digital signal, compensates interior lights signal and transmit the dispersion caused in a fiber, reduce the error rate of digital data transmission;
(22) local oscillator clock recovery: adopt Digital Phase-Locked Loop Technology to extract local oscillation signal clock, to ensure that data receiver is synchronous with the signal clock of signal input part from the digital signal of transmission;
(23) down-sampling: adopt high-frequency sampling to carry out the several sample value sampling in interval once, obtain new sequence, local optical signal clock recovery allows sample rate to be S
r=R
lO,to improve the signal to noise ratio of output signal;
(24) phase offset compensation: adopt the phase deviation that phase tracking algorithm compensating signal produces in transmitting procedure, ensures the Phase synchronization of signal between transmitter and receiver, to improve Receiver Precision;
(25) data cross is orthogonal: by signal I orthogonal for 4 roads
n+ jQ
n(n ∈ ﹛ 1,2,3,4 ﹜) is transformed to two-way and exports I
dPOn+ jQ
dPOn(n ∈ ﹛ 1,2 ﹜)
(3) compensating digits fluorescence oscilloscope (DPO) obtains the time difference of sample: after making up phase deviation, and the sample obtained by each digital fluorescence oscilloscope (DPO) DPO is staggered in time domain, produces two complex samples sequence: I
dPO1+ jQ
dPO1(from oscilloscope 1) and I
dPO2+ jQ
dPO2(from oscilloscope 2).
Because oscilloscope can not ensure enough accurately to be triggered, can not guarantee that two oscilloscopes accurately start to gather at synchronization, therefore, extra measure should be taked to generate 1 tunnel orthogonal signalling I+jQ and obtain final data-signal by compensation and carrier auxiliary technology.
(31) outside dispersion compensation: superposition negative dispersion digital signal, compensates external optical signal and transmit the dispersion caused in a fiber, reduce the error rate of digital data transmission;
(32) intersect orthogonal: by 2 tunnel orthogonal signalling I
dPOn+ jQ
dPOn(n ∈ ﹛ 1,2 ﹜) is transformed to 1 tunnel orthogonal signalling I+jQ;
(33) dispersion compensation: to the data acquisition dispersion compensation after interleaving access, with the loss in offset data interleaving access operation;
(34) fixing equalization filter: quadrature signal is fixed the equalization filtering of parameter, filters interference signal and other noise signals, guarantees receiving terminal useful signal;
(35) signal clock recovers: adopt Digital Phase-Locked Loop Technology to extract from the digital signal of transmission and be transmitted the clock of signal, is used for the useful signal recovering to be transmitted;
(36) frequency offset compensation: adopt the frequency difference that frequency locking technology compensating signal produces in transmitting procedure, ensures the Frequency Synchronization of signal between transmitter and receiver, to improve Receiver Precision; ;
(37) down-sampling: again adopt down-sampling technology to obtain new sequence, light signal clock recovery sample rate is S
r=R
lO,to improve the signal to noise ratio of final receiver signal;
(38) carrier phase recovery: adopt detection techniques reinsertion of carrier phase place, guarantee the precision of receiving terminal;
(39) error count: count the mistake in carrier auxiliary process, analytic statistics is to ensure the validity of receiving terminal data.
The present embodiment, without the need to optical clock recovery, can use the asynchronous pulse local oscillator of free-running operation, automatically can carry out polarization compensation and polarization mode compensation simultaneously, and realize the High Speed Transfer of signal, and reduce the loss of electronics.
Claims (5)
1., based on an optical communication system for digital coherent receiver, comprising the emitter for sending light, sending the receiving system of light for receiving and transmitting unit, described emitter by optical fiber link and receiving system wireless connections,
it is characterized in that:
Described emitter comprises laser emitting module, optical signal modulation delay process module, optical signal filtering module, and the laser that wherein laser emitting module is launched passes through the signal input part of optical signal modulation delay process model calling optical signal filtering module;
Described laser emitting module adopts external cavity laser;
Described optical signal modulation delay process module comprises electroabsorption modulator, I/Q modulator and fiber delay time multiplexer, the signal input part of described electroabsorption modulator receives the light of external cavity laser transmitting, and signal output part is by the signal input part of I/Q modulator connecting fiber time delayed multiplexer;
Described optical fiber link comprises two standard single-mode fibers, the Erbium-Doped Fiber Amplifier equal with standard single-mode fiber quantity;
The signal input part of described Erbium-Doped Fiber Amplifier connects the signal output part of optical signal filtering module, is connected with a standard single-mode fiber between two adjacent Erbium-Doped Fiber Amplifier;
Described receiving system comprises optical signal prosessing module, the local optical signal generation module that the light signal for coming optical fiber link transmission processes, and integrated relevant machine receiver module; The signal output part of the signal input part connecting fiber link of described optical signal prosessing module, signal output part connects the signal input part of integrated relevant machine receiver module, and the signal output part of local optical signal generation module connects the local signal input of integrated relevant machine receiver module;
Described optical signal prosessing module comprises variable optical attenuator, preamplifier, receiving terminal optical band pass filter and receiving terminal Erbium-Doped Fiber Amplifier, the signal output part of the signal input part connecting fiber link of described variable optical attenuator, its signal output part connects the signal input part of Erbium-Doped Fiber Amplifier successively by preamplifier, receiving terminal optical band pass filter;
It also comprises display processing unit light signal being carried out to Graphics Processing, and the signal input part of described display processing unit connects the signal output part of integrated relevant machine receiver module;
Described display processing unit comprises digital fluorescence oscilloscope, and carries out the processed off-line device of processed off-line to signal; The signal input part of described digital fluorescence oscilloscope connects integrated relevant machine receiver module by linear amplifier, and signal output part connects processed off-line device.
2. the optical communication system based on digital coherent receiver according to claim 1,
it is characterized in that:described filtration module adopts optical band pass filter, the signal output part of the signal input part connecting fiber time delayed multiplexer of described optical band pass filter.
3. the optical communication system based on digital coherent receiver according to claim 1 and 2,
it is characterized in that:described local optical signal generation module comprises local generating laser, local electroabsorption modulator, and local optical band pass filter; The signal input part of described local electroabsorption modulator receives the light that local generating laser sends, and signal output part connects the signal input part of local optical band pass filter;
Integrated relevant machine receiver module comprises four 90 ° of polarization mixing devices, and the output of each 90 ° of polarization mixing devices is respectively by the input of four detector connecting linear amplifiers.
4. as claimed in claim 1 or 2 based on the processing method that the optical communication system of digital coherent receiver outputs signal,
it is characterized in that:it comprises the following steps:
(1) correction of light front end is carried out to the signal that digital fluorescence oscilloscope exports;
(2) timing off-set between compensating digits fluorescence oscilloscope channel, comprises the following steps:
(21) inner dispersion compensation;
(22) local oscillator clock recovery;
(23) down-sampling;
(24) phase offset compensation;
(25) intersect orthogonal;
(3) compensating digits fluorescence oscilloscope obtains the time difference of sample, comprises the following steps:
(31) outside dispersion compensation;
(32) intersect orthogonal;
(33) dispersion compensation;
(34) fixing equalization filter;
(35) signal clock recovers;
(36) frequency offset compensation;
(37) down-sampling;
(38) carrier phase recovery;
(39) error count.
5. as claimed in claim 3 based on the processing method that the optical communication system of digital coherent receiver outputs signal,
it is characterized in that:it comprises the following steps:
(1) correction of light front end is carried out to the signal that digital fluorescence oscilloscope exports;
(2) timing off-set between compensating digits fluorescence oscilloscope channel, comprises the following steps:
(21) inner dispersion compensation;
(22) local oscillator clock recovery;
(23) down-sampling;
(24) phase offset compensation;
(25) intersect orthogonal;
(3) compensating digits fluorescence oscilloscope obtains the time difference of sample, comprises the following steps:
(31) outside dispersion compensation;
(32) intersect orthogonal;
(33) dispersion compensation;
(34) fixing equalization filter;
(35) signal clock recovers;
(36) frequency offset compensation;
(37) down-sampling;
(38) carrier phase recovery;
(39) error count.
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| JP6112192B2 (en) | 2013-03-15 | 2017-04-12 | 日本電気株式会社 | Optical transceiver, optical communication system, and optical transmission / reception method |
| CN104020461B (en) * | 2014-05-06 | 2017-01-04 | 南京大学 | Light path antidote in a kind of laser based on TDC algorithm |
| US9967048B1 (en) * | 2016-10-14 | 2018-05-08 | Juniper Networks, Inc. | Optical transceiver with external laser source |
| CN107979462B (en) * | 2017-12-29 | 2020-07-14 | 中南大学 | Quantum key distribution system based on orthogonal frequency division multiplexing and implementation method thereof |
| US10735104B2 (en) * | 2018-05-08 | 2020-08-04 | Maxim Integrated Products, Inc. | Systems and methods for analog electronic polarization control for coherent optical receivers |
| US11990941B2 (en) | 2018-05-08 | 2024-05-21 | Maxim Integrated Products, Inc. | Systems and methods for analog electronic polarization control for coherent optical receivers |
| AT522381B1 (en) * | 2019-04-25 | 2020-10-15 | Ait Austrian Inst Tech Gmbh | Arrangement for data transmission |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005086391A1 (en) * | 2004-03-09 | 2005-09-15 | Ericsson Ab | System, method and apparatus for polarization mode dispersion compensation and demultiplexing polarization multiplexed signals |
| CN101001111A (en) * | 2006-12-31 | 2007-07-18 | 华为技术有限公司 | Method, device and system for transmitting data signal using optical fibre |
| WO2012105081A1 (en) * | 2011-02-01 | 2012-08-09 | 日本電気株式会社 | Coherent optical receiver, and inter-channel skew detection device and detection method in coherent optical receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005086391A1 (en) * | 2004-03-09 | 2005-09-15 | Ericsson Ab | System, method and apparatus for polarization mode dispersion compensation and demultiplexing polarization multiplexed signals |
| CN101001111A (en) * | 2006-12-31 | 2007-07-18 | 华为技术有限公司 | Method, device and system for transmitting data signal using optical fibre |
| WO2012105081A1 (en) * | 2011-02-01 | 2012-08-09 | 日本電気株式会社 | Coherent optical receiver, and inter-channel skew detection device and detection method in coherent optical receiver |
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