CN105610565B - Auto-correlation zero-difference detection device and method based on mode multiplexing optical communication system - Google Patents
Auto-correlation zero-difference detection device and method based on mode multiplexing optical communication system Download PDFInfo
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- CN105610565B CN105610565B CN201510963411.5A CN201510963411A CN105610565B CN 105610565 B CN105610565 B CN 105610565B CN 201510963411 A CN201510963411 A CN 201510963411A CN 105610565 B CN105610565 B CN 105610565B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
- H04L7/007—Detection of the synchronisation error by features other than the received signal transition detection of error based on maximum signal power, e.g. peak value, maximizing autocorrelation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
- H04L7/0066—Detection of the synchronisation error by features other than the received signal transition detection of error based on transmission code rule
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Abstract
The invention discloses a kind of auto-correlation zero-difference detection device and method based on mode multiplexing optical communication system, is related to optical communication system field.The detection method includes: that the light source all the way in the N number of frequency point light source obtained by N number of relevant wavelength light source partial wave is divided into two-way, it is used as reference light source all the way, it is input to a mode of pattern multiplexer, another way and remaining frequency point light source is modulated, after multiplex, it is input to the b mode of pattern multiplexer, receiving end is sent to after mode multiplexing；After receiving end carries out mode demultiplexing, the corresponding frequency point light source of the signal of a mode is input in integrated coherent receiver as the corresponding frequency point light source of the signal of local oscillator light, b mode as signal light and carries out photoelectric conversion, signal is completed by DSP after four road ADC sampling and is restored.The present invention solves frequency departure and phase noise problems, and corresponding optical communication system structure is simple, reduces the complexity of digital signal processing algorithm, ensure that the spectrum efficiency of system.
Description
Technical field
The present invention relates to optical communication system technical fields, and in particular to it is a kind of based on mode multiplexing optical communication system from phase
Close zero-difference detection device and method.
Background technique
Digital coherent detection technique is able to achieve the amplitude modulation of full light, phase and polarization state management and can utilize e-mail
The functions such as optical fiber link compensating for loss and damage are realized in number processing in the electrical domain, in addition its generally acknowledged highly sensitive advantage, digital coherent inspection
Survey technology has become the reception mode generallyd use in commercial optical communication system at present.Digital coherent detection in, local oscillator light with
The frequency stability received between optical signal is considerable, if the frequency (or wavelength) of laser is with the difference of operating condition
And drift about, local oscillator light and the frequency received between optical signal just will appear deviation, and then can with the phase noise occurred
Influence receptivity.
Frequency departure and phase noise problems are solved using usual manner such as the methods of injecting lock mould and optical phase-locked loop,
It can only tolerate the very frequency shift (FS) of a small range and structure is complicated, phase noise estimation is also not easy to realize.And use digital coherent
The mode of detection, although frequency departure and the phase deviation due to being generated between local oscillator light and signal light can be by digital signal at
The mode of reason is compensated, but this method increase the complexities of Digital Signal Processing operation, increase system to digital signal
The requirement and power consumption for handling chip operational capability, especially for WDM (the Wavelength Division of mode division multiplexing
Multiplexing, wavelength-division multiplex) for optical communication system, system is more sensitive to local oscillator light and signal light frequency offset,
System is also more complicated, and digital signal processing algorithm is also more complicated.
Solution emerging at present is using auto-correlation zero-difference detection method.Auto-correlation zero-difference detection method is eliminating frequency
While rate deviation and phase noise, Receiver Complexity can effectively reduce, relax Light source line width requirement, reduce at digital signal
Manage algorithm complexity.But existing auto-correlation zero-difference detection is led due to using different wave length, polarization state, different fibre core
Frequency distal end transmission mode sacrifices the spectrum efficiency of system, therefore also less than optimal so that the spectrum efficiency of system is greatly reduced
Solution.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide one kind to be based on mode multiplexing optic communication system
The auto-correlation zero-difference detection device and method of system, usage mode is simple, can effectively eliminate system phase noise, without considering this
The frequency shift (FS) of vibration light and signal light, and number of lasers is few, corresponding optical communication system structure is relatively easy, reduces reception
The complexity for holding digital signal processing algorithm, ensure that the spectrum efficiency of system.
To achieve the above objectives, the technical solution adopted by the present invention is that: provide a kind of based on mode multiplexing optical communication system
Auto-correlation zero-difference detection device, including transmitting terminal and receiving end, it is characterised in that: the transmitting terminal includes that primary light source generates
Device, the first multi-carrier light generation device, the first channel-splitting filter, pattern multiplexer, the first wave multiplexer and N number of sending module, N be greater than
1 positive integer, the primary light source generator, the first multi-carrier light generation device, the first channel-splitting filter, pattern multiplexer sequentially phase
Even, the first channel-splitting filter also passes through N number of sending module and is connected with the first wave multiplexer, and the first wave multiplexer is connected with pattern multiplexer；Institute
Stating receiving end includes pattern demultiplexer, the second multi-carrier light generation device, the second channel-splitting filter, third channel-splitting filter, N number of integrated phase
Dry receiver, N number of No. four analog-digital converter ADC and N number of digital signal processor DSP, the pattern demultiplexer is respectively with
Two channel-splitting filters, the second multi-carrier light generation device are connected, and the second multi-carrier light generation device is connected with third channel-splitting filter, and second point
Wave device, third channel-splitting filter are connected with N number of integrated coherent receiver, each integrated coherent receiver by a four road ADC with
One DSP is connected；Wherein, the pattern multiplexer, pattern demultiplexer all have two modes: a mode and b mode, and mould
It is connected between formula multiplexer and pattern demultiplexer by optical fiber link.
Based on the above technical solution, the integrated coherent receiver includes the first polarization for receiving signal light
Beam splitter, the second polarization beam apparatus for receiving local oscillator light, 2 90 ° of frequency mixers and 4 balanced recivers；First polarization point
Beam device, the second polarization beam apparatus are connected with 2 90 ° of frequency mixers, and each 90 ° of frequency mixers are respectively connected with 2 balanced recivers.
Based on the above technical solution, the light source that the primary light source generator generates is narrow linewidth light source.
Based on the above technical solution, the optical fiber link includes less fundamental mode optical fibre and less fundamental mode optical fibre amplifier, and light
The correlation of the signal transmitted in fine link remains unchanged.
The present invention also provides a kind of auto-correlation zero-difference detections based on mode multiplexing optical communication system using above-mentioned apparatus
Method, comprising the following steps:
A, the light source for generating the primary light source generator of receiving end is sent into the first multi-carrier light generation device, makes it
Generate N number of relevant wavelength light source；The N number of relevant wavelength light source generated obtains corresponding N number of frequency point light source, N after the first channel-splitting filter
Light source all the way in a frequency point light source is divided into two-way through the first channel-splitting filter, is used as reference light source all the way, is input to pattern multiplexer
A mode input terminal, another way and remaining frequency point light source are after the modulation of sending module data, the first wave multiplexer multiplex, input
To the input terminal of the b mode of pattern multiplexer；Signal after carrying out mode multiplexing by pattern multiplexer, is transmitted through optical fiber link
To receiving end, it is transferred to step B；
B, the pattern demultiplexer of receiving end carries out mode demultiplexing to signal is received, by the signal of two modes point
From；The signal of a mode after separation generates N number of relevant wavelength light source, N number of relevant wavelength light by the second multi-carrier generation device
Source obtains the frequency point light source of N number of a mode after third channel-splitting filter, and the frequency point light source of each a mode is defeated as a local oscillator light
Enter the local oscillator light input end to an integrated coherent receiver；The signal of b mode after separation obtains N after the second channel-splitting filter
The frequency point light source of the frequency point light source of a b mode, each b mode is input to an integrated coherent receiver as a signal light
Signal light input end；Each integrated coherent receiver obtains corresponding telecommunications after carrying out photoelectric conversion to the optical signal received
Number, electric signal is input to DSP processing after four road ADC sampling, and receipt completion signal restores, and terminates.
Based on the above technical solution, the integrated coherent receiver includes the first polarization for receiving signal light
Beam splitter, the second polarization beam apparatus for receiving local oscillator light, 2 90 ° of frequency mixers and 4 balanced recivers；First polarization point
Beam device, the second polarization beam apparatus are connected with 2 90 ° of frequency mixers, and each 90 ° of frequency mixers are connected with 2 balanced recivers；
It is each integrated described in step B after coherent receiver carries out photoelectric conversion to the signal received and obtains corresponding electricity
Signal, specifically includes the following steps: the signal light inputted by signal light input end is separated into two after the first polarization beam apparatus
Road signal polarization light, two paths of signals polarised light are exported respectively to the signal input part of two 90 ° of frequency mixers；By local oscillator light input end
The local oscillator light of input is separated into two-way local oscillator polarised light after the second polarization beam apparatus, two-way local oscillator polarised light export respectively to
The local oscillator input terminal of 90 ° of frequency mixers of two-way；After each 90 ° of frequency mixers carry out four tunnel outputs, by corresponding two balanced recivers
It receives respectively, to realize photoelectric conversion.
Based on the above technical solution, the first multi-carrier light generation device is made to generate N number of related wave described in step A
When long light source, be based on cycle frequency move producing method, multistage modulator cascade producing method, light-pulse generator producing method or
One of nonlinear dielectric producing method.
Based on the above technical solution, N number of relevant wavelength light source described in step A be by same light source generate and
The identical multi-carrier light of frequency interval.
Based on the above technical solution, the light source that primary light source generator described in step A generates is narrow linewidth light
Source.
Based on the above technical solution, the signal after mode multiplexing is carried out described in step A by pattern multiplexer,
When being transmitted to receiving end through optical fiber link, the correlation of the signal transmitted in optical fiber link is remained unchanged.
The beneficial effects of the present invention are: the present invention is based on each when the frequency dependence of auto-correlation light source and mode division multiplexing
Not interfereing with each other property between mode is demultiplexed in receiving end using mode, is carried out to the reference light source propagated in one mode more
Carrier wave photogenerated multifrequency point local oscillator light source, the sheet of the integrated coherent receiver of corresponding signal wavelength is separately input by channel-splitting filter
Shake light input end, after photoelectric conversion, completes signal via analog-digital chip and Digital Signal Processing and restores.The present invention
In, due to be using homologous auto-correlation light source as local oscillator, the frequency base of modulated light carrier and corresponding local oscillator light
This can also be eliminated without offset, phase noise in coherent reception, reduce the complexity of Digital Signal Processing, and system does not have
Have and individually use idle frequency point as reference light source, spectrum efficiency is guaranteed, and demand of the system to number of lasers is small, corresponding
Wavelength-division multiplex and mode division multiplexing system structure are relatively easy, and coherent reception end light end is controlled without phaselocked loop or automatic frequency
Equal feedback devices, structure are also simplified, and have saved system cost.
Detailed description of the invention
Fig. 1 is the structural frames of the auto-correlation zero-difference detection device based on mode multiplexing optical communication system in the embodiment of the present invention
Figure；
Fig. 2 is the structural schematic diagram that coherent receiver is integrated in the embodiment of the present invention.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and embodiments.
Shown in Figure 1, the embodiment of the present invention provides a kind of auto-correlation homodyne spy based on mode multiplexing optical communication system
Device, including transmitting terminal and receiving end are surveyed, is connected between transmitting terminal and receiving end by optical fiber link.
Wherein, transmitting terminal includes that primary light source generator, the first multi-carrier light generation device, the first channel-splitting filter, mode are multiple
With device, the first wave multiplexer and N number of sending module, N is the positive integer greater than 1, the primary light source generator, the first multi-carrier light
Generation device, the first channel-splitting filter, pattern multiplexer are sequentially connected, and the first channel-splitting filter is also connected with N number of sending module respectively, N number of
Sending module is connected with the first wave multiplexer, and the first wave multiplexer is connected with pattern multiplexer.
Receiving end includes pattern demultiplexer, the second multi-carrier light generation device, the second channel-splitting filter, third channel-splitting filter, N number of
Integrated coherent receiver, N number of four roads ADC (Analog-Digital Converter, analog-digital converter) and N number of DSP
(Digital Signal Processor, digital signal processor), the pattern demultiplexer respectively with the second channel-splitting filter,
Two multi-carrier light generation devices are connected, and the second multi-carrier light generation device is connected with third channel-splitting filter, the second channel-splitting filter, third point
Wave device is connected with N number of integrated coherent receiver, and each integrated coherent receiver is connected with a four road ADC, each four roads ADC
It is connected with a DSP.
The pattern multiplexer of transmitting terminal, the pattern demultiplexer of receiving end all have two modes: a mode and b mode, and
It is connected between pattern multiplexer and pattern demultiplexer by optical fiber link.Optical fiber link includes that less fundamental mode optical fibre and less fundamental mode optical fibre are put
The correlation of big device, the multichannel wavelength-division multiplex signals transmitted in optical fiber link remains unchanged.
Shown in Figure 2, the integrated coherent receiver includes for receiving the first polarization beam apparatus of signal light, being used for
Receive the second polarization beam apparatus, 2 90 ° of frequency mixers and 4 balanced recivers of local oscillator light.Wherein, the first polarization beam apparatus,
Two polarization beam apparatus are connected with 2 90 ° of frequency mixers, and each 90 ° of frequency mixers are connected with 2 balanced recivers, and each balance connects
Receipts machine has 2 integrated waveguide PD (PIN-Photodiode).
The embodiment of the present invention also provides a kind of auto-correlation zero based on mode multiplexing optical communication system using above-mentioned apparatus
Poor detection method, comprising the following steps:
Step S1: the light source that primary light source generator is generated is sent into the first multi-carrier light generation device, makes its generation
N number of relevant wavelength light source, is transferred to step S2.
Wherein, when the first multi-carrier light generation device being made to generate N number of relevant wavelength light source described in step S1, it can be and be based on
Cycle frequency is moved producing method, multistage modulator cascade producing method, light-pulse generator producing method or nonlinear dielectric and is generated
One of mode.N number of relevant wavelength light source is by same light source generation and the identical multi-carrier light of frequency interval.
Step S2: N number of relevant wavelength light source of generation obtains corresponding N number of frequency point light source, N number of frequency point after the first channel-splitting filter
Light source all the way in light source is divided into two-way through the first channel-splitting filter, is used as reference light source all the way, is input to a mode of pattern multiplexer
Input terminal, it is multiple to be input to mode after the modulation of sending module data, the first wave multiplexer multiplex for another way and remaining frequency point light source
With the input terminal of the b mode of device；Signal after carrying out mode multiplexing by pattern multiplexer, is transmitted to reception through optical fiber link
End, is transferred to step S3.
Step S3: the pattern demultiplexer of receiving end carries out mode demultiplexing to signal is received, by the letter of two modes
Number separation；The signal of a mode after separation generates N number of relevant wavelength light source, N number of correlation wave by the second multi-carrier generation device
Long light source obtains the frequency point light source of N number of a mode after third channel-splitting filter, and the frequency point light source of each a mode is as a local oscillator
Light is input to the local oscillator light input end of an integrated coherent receiver；The signal of b mode after separation is after the second channel-splitting filter
The frequency point light source of N number of b mode is obtained, the frequency point light source of each b mode is input to an integrated phase stem grafting as a signal light
The signal light input end of receipts machine, is transferred to step S4.
Step S4: each integrated coherent receiver obtains corresponding telecommunications after carrying out photoelectric conversion to the optical signal received
Number, electric signal is input to DSP processing after four road ADC sampling, and receipt completion signal restores, and terminates.
For a better understanding of the present invention, below by specific embodiment to auto-correlation zero-difference detection method of the invention into
Row is described in detail.
Shown in Figure 1, it is f that the primary light source generator of transmitting terminal, which generates frequency,0Narrow linewidth light source, more than first
After carrier wave light generating device, generation frequency is f1、f2、…、fnRelevant wavelength light source；The relevant wavelength light source passes through first
Channel-splitting filter respectively obtains each frequency point light source, will frequency be wherein f1Light source be divided into two-way through the first channel-splitting filter, reserve wherein one
Road is used as reference light source, is input to the input terminal of a mode of pattern multiplexer, and another way and remaining frequency point light source are separately input to
The modulated light source input terminal of corresponding sending module forms wavelength-division multiplex signals through the first wave multiplexer after sending module is modulated,
The wavelength-division multiplex signals are input to the input terminal of the b mode of pattern multiplexer；Pattern multiplexer forms mould after carrying out mode multiplexing
Division multiplex signal is transmitted to receiving end by optical fiber link；
The signal that receiving end receives is divided into two modes of a, b after pattern demultiplexer demultiplexes, and mode a is frequency
Rate is f1Reference light source, generated after the second multi-carrier light generation device multiple frequencies be f'1、f'2、…、f'nRelated wave
Long light source is exported respectively using one-to-one mode to the local oscillator of corresponding integrated coherent receiver after third channel-splitting filter
Light input end；Another mode b is frequency f1、f2、…、fnSignal light, after the second channel-splitting filter, using one-to-one side
Formula is exported respectively to the signal light input end of corresponding integrated coherent receiver；
Each integrated coherent receiver generates four road electric signals after carrying out photoelectric conversion, and four road electric signals are via four road ADC
After analog to digital conversion is at digital signal, it is input to DSP and carries out signal processing, recover signal.
It is shown in Figure 2, coherent receiver is each integrated described in step S4, and photoelectric conversion is carried out to the signal received
After obtain corresponding electric signal, specifically includes the following steps: the signal light inputted by signal light input end is by the first polarization point
Two paths of signals polarised light is separated into after beam device, two paths of signals polarised light is exported respectively to the signal input part of two 90 ° of frequency mixers；
The local oscillator light inputted by local oscillator light input end is separated into two-way local oscillator polarised light after the second polarization beam apparatus, and two-way local oscillator is inclined
Vibration light is exported respectively to the local oscillator input terminal of 90 ° of frequency mixers of two-way；After each 90 ° of frequency mixers carry out four tunnel outputs, by corresponding
Two balanced recivers receive respectively, to realize photoelectric conversion.
In the present invention, for single polarization, the signal light E of inputSWith local oscillator light ELOIt respectively indicates are as follows:
ES=AS(t)exp(jωst) (1.1)
ELO=ALO(t)exp(jωLOt) (1.2)
Wherein AS, ALORespectively represent the complex amplitude of signal light and local oscillator light, ωs, ωLORespectively represent signal light and local oscillator light
Angular frequency, optical power is respectively PS=| AS|2/2,PLO=| ALO|2/ 2, it is respectively indicated by the output signal light of 90 ° of frequency mixers
Are as follows:
After being received respectively using photodetector, the photoelectricity river branch of output is expressed as:
Wherein R is photodetector response factor, θSig, θLOThe phase of signal light and local oscillator light is respectively indicated, and represents letter
The difference ω of the angular frequency of number light and local oscillator lightIFAre as follows:
ωIF=ωS-ωLO, (1.11)
Then the photocurrent values of balanced reciver output are respectively as follows:
Then the signal of its output may be expressed as:
For arbitrary signal light fn, by phase diversity integrated coherent receiver output signal may be expressed as:
Wherein Pfn, ωfn, θfnIt respectively indicates into 90 ° of mixer signal input terminals and frequency is fnAfter relevant light-receiving
Signal photoelectric current, optical power, angular frequency, phase value, Pf′n, ωf′n, θf′n90 ° of frequency mixer local oscillator inputs of the entrance respectively indicated
Holding corresponding signal light frequency is f'nSignal photoelectric current, optical power, angular frequency, phase value, n be (1,2 ... n).
Since signal light and local oscillator light are all based on what the same single light source was generated by multi-carrier generation device, frequency
Between be divided into f, homology and correlation based on signal light and local oscillator light, our available arbitrary signal light frequencies with it is corresponding
Local oscillator light frequency be it is identical, phase change be also it is identical, i.e.,
ωfn-ωf′n=0 (1.16)
θfn-θf′n=0 (1.17)
It similarly, is also such to another polarized light signal.
Therefore, by above-mentioned analysis: mode division multiplexing light can be eliminated using auto-correlation zero-difference detection method of the invention
Difference on the frequency and phase difference in communication system when arbitrary signal light-receiving, and usage mode is simple, and number of lasers is few, corresponding
Optical communication system structure it is relatively easy, reduce the complexity of receiving end digital signal processing algorithm, ensure that the spectrum of system
Efficiency.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (9)
1. a kind of auto-correlation zero-difference detection device based on mode multiplexing optical communication system, including transmitting terminal and receiving end, special
Sign is: the transmitting terminal includes primary light source generator, the first multi-carrier light generation device, the first channel-splitting filter, mode multiplexing
Device, the first wave multiplexer and N number of sending module, N are the positive integer greater than 1, and the primary light source generator, the first multi-carrier light produce
Generating apparatus, the first channel-splitting filter, pattern multiplexer are sequentially connected, and the first channel-splitting filter also passes through N number of sending module and the first wave multiplexer
It is connected, the first wave multiplexer is connected with pattern multiplexer；
The receiving end includes pattern demultiplexer, the second multi-carrier light generation device, the second channel-splitting filter, third channel-splitting filter, N number of
Integrated coherent receiver, N number of No. four analog-digital converter ADC and N number of digital signal processor DSP, the pattern demultiplexer point
It is not connected with the second channel-splitting filter, the second multi-carrier light generation device, the second multi-carrier light generation device is connected with third channel-splitting filter,
Second channel-splitting filter, third channel-splitting filter are connected with N number of integrated coherent receiver, and each integrated coherent receiver passes through four tunnels
ADC is connected with a DSP,
Wherein, the pattern multiplexer, pattern demultiplexer all have two modes: a mode and b mode, and pattern multiplexer
It is connect between pattern demultiplexer by optical fiber link,
Light source all the way in N number of frequency point light source is divided into two-way through the first channel-splitting filter, is used as reference light source all the way, and it is multiple to be input to mode
With the input terminal of a mode of device, another way and remaining frequency point light source are modulated through sending module data, after the first wave multiplexer multiplex,
It is input to the input terminal of the b mode of pattern multiplexer,
The light source that the primary light source generator generates is narrow linewidth light source,
The signal of a mode after separation generates N number of relevant wavelength light source, N number of relevant wavelength by the second multi-carrier generation device
Light source obtains the frequency point light source of N number of a mode after third channel-splitting filter, and the frequency point light source of each a mode is as a local oscillator light
It is input to the local oscillator light input end of an integrated coherent receiver,
The signal of b mode after separation obtains the frequency point light source of N number of b mode, the frequency point of each b mode after the second channel-splitting filter
Light source is input to the signal light input end of an integrated coherent receiver as a signal light；Each integrated coherent receiver pair
The optical signal received obtains corresponding electric signal after carrying out photoelectric conversion, and electric signal is input to after four road ADC sampling
DSP processing,
Mode a is that frequency is f1Reference light source, generated after the second multi-carrier light generation device multiple frequencies be f'1、f
'2、…、f'nRelevant wavelength light source exported respectively using one-to-one mode to corresponding integrated after third channel-splitting filter
The local oscillator light input end of coherent receiver；
Another mode b is frequency f1、f2、…、fnSignal light distinguished after the second channel-splitting filter using one-to-one mode
It exports to the signal light input end of corresponding integrated coherent receiver；
The signal light E of inputSWith the local oscillator light ELOIt respectively indicates are as follows:
ES=AS(t)exp(jωst) (1.1)
ELO=ALO(t)exp(jωLOt) (1.2)
The then optical power P of the corresponding signal lightSWith the optical power P of the local oscillator lightL0Respectively
PS=| AS|2/ 2,
PLO=| ALO|2/ 2,
Wherein AS, ALORespectively represent the complex amplitude of the signal light and the local oscillator light, ωs, ωLORespectively represent signal light and this
The angular frequency of vibration light.
2. the auto-correlation zero-difference detection device based on mode multiplexing optical communication system as described in claim 1, it is characterised in that:
The integrated coherent receiver includes the second polarization for receiving the first polarization beam apparatus of signal light, for receiving local oscillator light
Beam splitter, 2 90 ° of frequency mixers and 4 balanced recivers；First polarization beam apparatus, the second polarization beam apparatus are mixed with 2 90 °
Frequency device is connected, and each 90 ° of frequency mixers are respectively connected with 2 balanced recivers,
Four signal lights of the signal light by the output of 90 ° of frequency mixers respectively indicate are as follows:
3. the auto-correlation zero-difference detection device based on mode multiplexing optical communication system as described in claim 1, it is characterised in that:
The optical fiber link includes less fundamental mode optical fibre and less fundamental mode optical fibre amplifier, and the correlation of the signal transmitted in optical fiber link is kept not
Become.
4. a kind of auto-correlation zero-difference detection method based on mode multiplexing optical communication system using claim 1 described device,
Described device, including transmitting terminal and receiving end, the transmitting terminal include primary light source generator, the generation of the first multi-carrier light
Device, the first channel-splitting filter, pattern multiplexer, the first wave multiplexer and N number of sending module, N are the positive integer greater than 1, described initial
Light source generator, the first multi-carrier light generation device, the first channel-splitting filter, pattern multiplexer are sequentially connected, and the first channel-splitting filter is also logical
It crosses N number of sending module to be connected with the first wave multiplexer, the first wave multiplexer is connected with pattern multiplexer；
The receiving end includes pattern demultiplexer, the second multi-carrier light generation device, the second channel-splitting filter, third channel-splitting filter, N number of
Integrated coherent receiver, N number of No. four analog-digital converter ADC and N number of digital signal processor DSP, the pattern demultiplexer point
It is not connected with the second channel-splitting filter, the second multi-carrier light generation device, the second multi-carrier light generation device is connected with third channel-splitting filter,
Second channel-splitting filter, third channel-splitting filter are connected with N number of integrated coherent receiver, and each integrated coherent receiver passes through four tunnels
ADC is connected with a DSP,
Wherein, the pattern multiplexer, pattern demultiplexer all have two modes: a mode and b mode, and pattern multiplexer
It is connect between pattern demultiplexer by optical fiber link,
Light source all the way in N number of frequency point light source is divided into two-way through the first channel-splitting filter, is used as reference light source all the way, and it is multiple to be input to mode
With the input terminal of a mode of device, another way and remaining frequency point light source are modulated through sending module data, after the first wave multiplexer multiplex,
It is input to the input terminal of the b mode of pattern multiplexer,
The light source that the primary light source generator generates is narrow linewidth light source,
The signal of a mode after separation generates N number of relevant wavelength light source, N number of relevant wavelength by the second multi-carrier generation device
Light source obtains the frequency point light source of N number of a mode after third channel-splitting filter, and the frequency point light source of each a mode is as a local oscillator light
It is input to the local oscillator light input end of an integrated coherent receiver,
The signal of b mode after separation obtains the frequency point light source of N number of b mode, the frequency point of each b mode after the second channel-splitting filter
Light source is input to the signal light input end of an integrated coherent receiver as a signal light；Each integrated coherent receiver pair
The optical signal received obtains corresponding electric signal after carrying out photoelectric conversion, and electric signal is input to after four road ADC sampling
DSP processing,
Mode a is that frequency is f1Reference light source, generated after the second multi-carrier light generation device multiple frequencies be f'1、f
'2、...、f'nRelevant wavelength light source exported respectively using one-to-one mode to corresponding integrated after third channel-splitting filter
The local oscillator light input end of coherent receiver；
Another mode b is frequency f1、f2、…、fnSignal light distinguished after the second channel-splitting filter using one-to-one mode
It exports to the signal light input end of corresponding integrated coherent receiver；
The signal light E of inputSWith the local oscillator light ELOIt respectively indicates are as follows:
ES=AS(t)exp(jωst) (1.1)
ELO=ALO(t)exp(jωLOt) (1.2)
The then optical power P of the corresponding signal lightSWith the optical power P of the local oscillator lightL0Respectively
PS=| AS|2/ 2,
PLO=| ALO|/2,
Wherein AS, ALORespectively represent the complex amplitude of the signal light and the local oscillator light, ωs, ωLORespectively represent signal light and this
The angular frequency of vibration light,
Characterized by comprising the following steps:
A, the light source for generating the primary light source generator of transmitting terminal is sent into the first multi-carrier light generation device, it is made to generate N
A relevant wavelength light source；The N number of relevant wavelength light source generated obtains corresponding N number of frequency point light source, N number of frequency point after the first channel-splitting filter
Light source all the way in light source is divided into two-way through the first channel-splitting filter, is used as reference light source all the way, is input to a mode of pattern multiplexer
Input terminal, it is multiple to be input to mode after the modulation of sending module data, the first wave multiplexer multiplex for another way and remaining frequency point light source
With the input terminal of the b mode of device；Signal after carrying out mode multiplexing by pattern multiplexer, is transmitted to reception through optical fiber link
End, is transferred to step B；
B, the pattern demultiplexer of receiving end carries out mode demultiplexing to signal is received, by the Signal separator of two modes；Point
The signal of a mode from after generates N number of relevant wavelength light source, N number of relevant wavelength light source warp by the second multi-carrier generation device
The frequency point light source of N number of a mode is obtained after crossing third channel-splitting filter, the frequency point light source of each a mode is input to as a local oscillator light
The local oscillator light input end of one integrated coherent receiver；The signal of b mode after separation obtains N number of b after the second channel-splitting filter
The frequency point light source of mode, the frequency point light source of each b mode are input to the letter of an integrated coherent receiver as a signal light
Number light input end；Each integrated coherent receiver obtains corresponding electric signal after carrying out photoelectric conversion to the optical signal received,
Electric signal is input to DSP processing after four road ADC sampling, and receipt completion signal restores, and terminates.
5. the auto-correlation zero-difference detection method based on mode multiplexing optical communication system as claimed in claim 4, it is characterised in that:
The integrated coherent receiver includes the second polarization for receiving the first polarization beam apparatus of signal light, for receiving local oscillator light
Beam splitter, 2 90 ° of frequency mixers and 4 balanced recivers；First polarization beam apparatus, the second polarization beam apparatus are mixed with 2 90 °
Frequency device is connected, and each 90 ° of frequency mixers are connected with 2 balanced recivers；
It is each integrated described in step B after coherent receiver carries out photoelectric conversion to the signal received and obtains corresponding telecommunications
Number, specifically includes the following steps: the signal light inputted by signal light input end is separated into two-way after the first polarization beam apparatus
Signal polarization light, two paths of signals polarised light are exported respectively to the signal input part of two 90 ° of frequency mixers；It is defeated by local oscillator light input end
The local oscillator light entered is separated into two-way local oscillator polarised light after the second polarization beam apparatus, and two-way local oscillator polarised light is exported respectively to two
The local oscillator input terminal of 90 ° of road frequency mixer；After each 90 ° of frequency mixers carry out four tunnel outputs, by corresponding two balanced recivers point
It does not receive, to realize photoelectric conversion.
6. the auto-correlation zero-difference detection method based on mode multiplexing optical communication system as claimed in claim 4, it is characterised in that:
It is that generation is moved based on cycle frequency when the first multi-carrier light generation device being made to generate N number of relevant wavelength light source described in step A
One of mode, multistage modulator cascade producing method, light-pulse generator producing method or nonlinear dielectric producing method.
7. the auto-correlation zero-difference detection method based on mode multiplexing optical communication system as claimed in claim 4, it is characterised in that:
N number of relevant wavelength light source described in step A is by same light source generation and the identical multi-carrier light of frequency interval.
8. the auto-correlation zero-difference detection method based on mode multiplexing optical communication system as claimed in claim 4, it is characterised in that:
The light source that primary light source generator described in step A generates is narrow linewidth light source.
9. the auto-correlation zero-difference detection method based on mode multiplexing optical communication system as claimed in claim 4, it is characterised in that:
The signal after mode multiplexing, when being transmitted to receiving end through optical fiber link, optical fiber chain are carried out described in step A by pattern multiplexer
The correlation of the signal transmitted in road remains unchanged.
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| CN109818682B (en) * | 2019-01-22 | 2020-09-22 | 烽火通信科技股份有限公司 | Coherent signal transceiving method and device and coherent passive optical network system |
| CN109802289A (en) * | 2019-03-11 | 2019-05-24 | 电子科技大学 | Mould erbium-doped fiber amplifier is lacked in a kind of low difference mode gain |
| CN110266387B (en) * | 2019-07-29 | 2021-02-09 | 南京信息工程大学 | Multi-band optical carrier radio frequency system and method based on weak mode group coupling and probability shaping |
| CN113031919B (en) * | 2019-12-25 | 2023-04-07 | 山东国迅量子芯科技有限公司 | Quantum random number generating device, method and equipment based on coherent optical receiver |
| CN112887033B (en) * | 2021-05-06 | 2021-08-24 | 北京中创为南京量子通信技术有限公司 | CV-QKD system and quantum key distribution method |
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