CN105871499A - Ultra-high-speed spatial coherent optical communication method and system based on optical frequency comb - Google Patents
Ultra-high-speed spatial coherent optical communication method and system based on optical frequency comb Download PDFInfo
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Abstract
The invention discloses an ultra-high-speed spatial coherent optical communication method and system based on an optical frequency comb. The method comprises the steps of firstly generating a multi-wavelength autocorrelation light source by using an optical frequency comb generator and an optical frequency comb amplification shaping unit, modulating a plurality of paths of high-speed communication electric signals to the light source to form a multi-wavelength autocorrelation high-speed Binary Phase Shift Keying (BPSK) coherent optical signal, multiplexing the BPSK coherent optical signal into an ultra-high-speed optical signal by using a wavelength division multiplexer, transmitting the ultra-high-speed optical signal through spatial coupling of an optical antenna, and receiving the ultra-high-speed optical signal by a receiving unit after the inter-satellite and. The invention solves the problems that a plurality of independent lasers are used as light sources, carrier waves are difficult to coordinate and synchronize, the stability of the wavelength, the line width and the phase of the light source of the laser at a receiving end is difficult to control, and the like, and has simple structure and reduced popularization difficulty.
Description
Technical field
The invention belongs to laser space communication field.Relate to laser space communication system ultra high speed signal to produce and the implementation method of coherent reception.
Background technology
Laser space communication owing to having that message capacity is big, good directionality, size are little, volume and the advantage such as power consumption is little, the most become the important subject in space communication field.Along with the explosive increase of satellite data, for two-forty, distance star between, star ground optical communication system, the technological means utilizing higher order modulation formats and light multiplex mode to combine has become very effective solution.Existing laser space communication mostly uses intensity modulated, the mode of direct detection communicates, when light wave is propagated in space, owing to being affected by veiling glares such as daylight, moonlight, starlight, air and seawaters, detectable signal is mingled with the strongest ambient noise, the bit error rate of communication will be increased, reduce communication quality.
Coherent light communication system has extremely strong wavelength selectivity, and available frequency-domain multi-channel multiplexing improves traffic rate, is to realize superelevation rate communication effective means.Wavelength selectivity i.e. narrow-band filtering characteristic makes coherent communication machine be substantially reduced the sensitivity of wide band background light, is affected minimum by sun background, earth background and other starlight background.It is the laser communication terminal (LTC) that 5.625Gbps binary phase shift keying (BPSK) is modulated that Germany's laser communication terminal TerraSAR-X carries a traffic rate, realize the data on Space laser communications and satellite-ground laser communication, and real-time Transmission synthetic aperture radar.Experiment proves the coherent optical communication system laser communication system compared to intensity modulated direct detection, and the receiving sensitivity of system improves to optimal detection sensitivity 10-9Error rate condition under, 9 photon/bit, support star ground transmission between the star of distance, and make communication quality significantly increase, efficiently solve between star, the detectivity bottleneck problem of star ground distance satellite communication.
Wavelength-division multiplex (WDM) technology refers to that the signal of telecommunication of multichannel is loaded on the light wave of different wave length by Electro-optical Modulation, after optical signal is combined by wave multiplexer again, and a kind of communication technology transmitted by same link.Wavelength-division multiplex technique makes full use of laser communication bandwidth, is effectively improved information rate and channel capacity.Wavelength-division multiplex technique solves the information capacity bottleneck problem of space communication as a kind of simple and ripe multiplex technique, mass data transfers can be realized, in space information network, information attacking and defending and Space Target Surveillance, play the important and effect of uniqueness, be the communication mode of a kind of great prospect.
In the coherent reception system of wavelength-division multiplex, high performance coherent detection system needs signal laser source and local oscillator lasing light emitter should have high stability and strict relative phase relation to ensure the coherence of two light fields, and this is one of difficult point and the key technology of coherent detection technology.Traditional multichannel light source is laser array, for each wavelength channel, all a laser instrument will be used as light source, data-signal to be modulated, the co-wavelength laser instrument of equal number, 90 degree of frequency mixers of light, photoelectricity balanced detector and the optical signal received can be used to carry out the process that coherent demodulation completes to receive at receiving terminal simultaneously.At present in existing program, each wavelength channel is required for the function that two identical light sources of wavelength complete to send and receive, whole system demand to number of lasers has been significantly greatly increased, receiving terminal also needs 90 degree of frequency mixers of multiple light, photoelectricity balanced detector, there is system architecture complicated, the shortcoming such as relatively costly.In addition, carrier wave is there is and is difficult to coordinate synchronization in multiple independent laser instruments as light source, the stability of receiving terminal laser optical source wavelength, live width and phase place significantly limit the performance of its coherent reception, becomes development ultrahigh speed, the technical bottleneck of high sensitivity spatial coherence optic communication.
Summary of the invention
In the spatial coherence optical communication system of phase-modulation, the problems such as the local oscillator laser light source multiple independent laser instruments of needs of transmitting terminal laser light source and receiving terminal exist carrier wave as light source and are difficult to coordinate synchronization, the stability difficulty control of laser optical source wavelength, live width and phase place.Simultaneously, receiving terminal uses the function of optical phase-locked loop to be to input by regenerating phase the reception signal of noise jamming from receiving terminal, follow the tracks of flashlight phase place over time, tuning control local oscillator laser instrument locks with the phase place of signal laser, to realize phase coherence coherent demodulation in 90 degree of frequency mixers of local oscillator light and flashlight.
In satellite communication system, BPSK photoreceiver uses phase locking unit to carry out the coherent light communication between high rail satellite of phase controlling and Phase Tracking, owing to the relative motion between satellite communication object produces Doppler effect, and causing flashlight is a random value rather than the fixed value of demodulation needs with the difference on the frequency of local oscillator light.So the Doppler frequency shift caused due to satellite relative motion must be carried out real-time estimation and compensation by frescan and frequency compensator to Doppler frequency shift.
It is an object of the invention to the shortcoming overcoming above-mentioned prior art, a kind of ultrahigh speed space optical communication method and system based on optical frequency comb is provided, the method produces high-quality auto-correlation light source based on optical frequency comb generator and the big shaping unit of optical frequency comb method, create the phase locked LASER Light Source of multi-wavelength, produce for ultrahigh speed space optical communication system signal and the offer effective ways of high sensitivity weak signal coherent reception.
The technical scheme that the present invention takes is as follows:
The system of ultrahigh speed spatial coherence optic communication based on optical frequency comb, it is characterised in that: include multi-wavelength auto-correlation light source generation unit, ultrahigh speed coherent light signal generation unit and receive unit；
Multi-wavelength auto-correlation light source generation unit includes that the laser instrument, optical frequency comb generator and the optical frequency comb that are sequentially connected amplify shaping unit；Laser instrument is for providing Single wavelength LASER Light Source to optical frequency comb generator, and optical frequency comb generator is for being converted to phase locked multiple wavelength laser light source by Single wavelength laser；Optical frequency comb amplifies shaping unit and is amplified being shaped as the multiwavelength laser that power is equal by the power of multiple wavelength laser light source；
Ultrahigh speed coherent light signal generation unit includes optical demultiplexer A, electrooptic modulator group, optical multiplexer, image intensifer and optical transmitting antenna, and electrooptic modulator group includes m electrooptic modulator；
Receive unit and include that optical receiver antenna, 90 degree of frequency mixers of light, optical demultiplexer B, local oscillator light source cell, optical phase-locked loop branch road and m signal of communication process branch road；
Optical demultiplexer A includes m output, and m the high-speed communication signal of telecommunication of m output and user input with described m electrooptic modulator respectively is connected；M electrooptic modulator m high speed coherent light signal of output；
The output of m electrooptic modulator is all connected with the input of optical multiplexer, and the output of optical multiplexer is connected with optical transmitting antenna by image intensifer, and optical transmitting antenna is connected with optical receiver antenna and 90 degree of frequency mixers of light successively by atmospheric channel；
Wherein, corresponding laser and the telex network signal of telecommunication at a high speed are modulated to high speed coherent light signal and send to optical multiplexer by electrooptic modulator；High speed coherent light signal is multiplexed with ultrahigh speed coherent light signal by optical multiplexer, and pass sequentially through image intensifer, optical transmitting antenna sends to space, through between the star of long-distance, transmit star after received by optical receiver antenna and send to 90 degree of frequency mixers of light；
Signal of communication processes branch road and includes 1 branch road A and m-1 bar branch road B, and branch road A includes the first balanced detector, power splitter, wave filter and clock recovery unit；Power splitter is 1 × 2 power splitter；Branch road B includes the first balanced detector, wave filter and clock recovery unit；
Described optical phase-locked loop branch road includes the second balanced detector, multiplier, phase locking unit, frescan and the Doppler compensator being sequentially connected；Doppler compensator is connected with described local oscillator light source cell；
In described branch road A, the first balanced detector is connected with the input of power splitter, and two outputs of power splitter are respectively the first output and the second output, and the first output is connected with multiplier, and the second output is connected with clock recovery unit by wave filter；In branch road B, the first balanced detector is connected with clock recovery unit by wave filter；
Described optical demultiplexer B has 4, the respectively first optical demultiplexer, the second optical demultiplexer, the 3rd optical demultiplexer and the 4th optical demultiplexer；
Optical receiver antenna for being coupled into 90 degree of frequency mixers of light by optical signal；90 degree of frequency mixers of local oscillator light source cell and light are connected, for the local oscillator light corresponding with optical signal to 90 degree of frequency mixers offers of light；
90 degree of frequency mixers of light are for being phase place respectively homophase 0 °, 180 ° and orthogonal 90 °, 270 ° tetra-tunnel ultrahigh speed mixing optical signals by the optical signal demodulation received and the ultrahigh speed mixing optical signal that phase place is 0 °, 180 °, 90 ° and 270 ° being respectively sent to the first optical demultiplexer, the second optical demultiplexer, the 3rd optical demultiplexer and the 4th optical demultiplexer；
Optical demultiplexer B includes that the first balanced detector that m output of m output, the first optical demultiplexer and the second optical demultiplexer processes branch road with m signal of communication respectively is connected；
One output of the 3rd optical demultiplexer and an output of the 4th optical demultiplexer are connected with described second balanced detector respectively.
Other outputs of 3rd optical demultiplexer and the 4th optical demultiplexer are for exporting corresponding optical signal to external environment condition.
It is amplification shaping unit based on phase sensitive or phase-unsensitive Fiber-optic parameter that above-mentioned optical frequency comb amplifies shaping unit.
Above-mentioned electrooptic modulator is lithium niobate electrooptic modulator, InP-base semi-conductor electricity optical modulator.
Above-mentioned wave filter is low pass frequency filters.
Above-mentioned optical multiplexer is wavelength division multiplexer.
The structure of above-mentioned local oscillator light source cell is identical with the structure of multi-wavelength auto-correlation light source generation unit；Described Doppler compensator is connected with the laser instrument of local oscillator light source cell, for compensating ultrahigh speed coherent light signal generation unit and receiving the Doppler effect that between unit, relative motion produces；The optical frequency comb of local oscillator light source cell amplifies 90 degree of frequency mixers of shaping unit and light and is connected.
The method utilizing said system to realize ultrahigh speed spatial coherence optic communication, comprises the following steps:
(1) it is f by frequencyiSingle wavelength laser be converted to phase locked multiwavelength laser；Wherein, multiwavelength laser includes the laser of m wavelength；
(2) power of multiwavelength laser is carried out entirety and zoom into the multiwavelength laser that power is equal；
(3) multiwavelength laser obtained through step (2) is demultiplexing as m independent laser；
(4) the high-speed communication signal of telecommunication of user being loaded into corresponding Laser Modulation is high speed coherent light signal；
(5) high speed coherent light signal is multiplexed with ultrahigh speed coherent light signal, then being entered by transmitting antenna after being amplified by image intensifer and received by reception antenna after atmospheric channel is transmitted and send to 90 degree of frequency mixers of light, local oscillator light source cell is to 90 degree of frequency mixers input local oscillator light of light simultaneously；Then the optical signal demodulation received is 0 ° of phase place respectively homophase, 180 ° and orthogonal 90 °, 270 ° tetra-tunnel ultrahigh speed mixing optical signals and the ultrahigh speed mixing optical signal that phase place is 0 °, 180 °, 90 ° and 270 ° is respectively sent to the first optical demultiplexer, the second optical demultiplexer, the 3rd optical demultiplexer and the 4th optical demultiplexer by 90 degree of frequency mixers of light；
Homophase ultrahigh speed mixing optical signal is demultiplexing as m independent homophase mixing optical signal at a high speed by (6) first optical demultiplexer and the second optical demultiplexer, is then handled as follows homophase mixing optical signal at a high speed:
It is f by an output of the first optical demultiplexer and an output of the second optical demultiplexer by frequencyiHomophase at a high speed mixing optical signal send to the first balanced detector；Homophase mixing optical signal at a high speed is converted to the homophase mixing signal of telecommunication at a high speed and sends to power splitter by the first balanced detector；The homophase mixing signal of telecommunication at a high speed is sent to multiplier by power splitter by the first output；By the second output, to wave filter, homophase mixing signal of telecommunication transmission at a high speed is carried out filter to make an uproar, be then reduced into the original high-speed communication signal of telecommunication by clock recovery system；
Other comprise m-1 frequency is f1、f2…、fi-1、fi+1、…、fmHomophase at a high speed mixing optical signal sent to the first balanced detector by other outputs of the first optical demultiplexer and other outputs of the second optical demultiplexer；Homophase at a high speed mixing optical signal is converted to the homophase mixing signal of telecommunication at a high speed, is sent directly to wave filter and carries out filter and make an uproar by the first balanced detector, is then reduced into m-1 the original high-speed communication signal of telecommunication by clock recovery system；
Orthogonal ultrahigh speed mixing optical signal is demultiplexing as m independent orthogonal high speed mixing optical signal by the 3rd optical demultiplexer and the 4th optical demultiplexer, and is f by an output of the 3rd optical demultiplexer and an output of the 4th optical demultiplexer by frequencyiOrthogonal high speed mixing optical signal send to the second balanced detector, orthogonal high speed mixing optical signal is converted to the orthogonal high speed mixing signal of telecommunication by the second balanced detector, is then forwarded to multiplier；
Multiplier extracts the phase error information of the signal of telecommunication received and is sent by phase error information to phase locking unit, and phase locking unit carries out genlocing according to the phase place of phase error information tuning control local oscillator light source cell with the optical signal of input to 90 degree of frequency mixers of light；
Corresponding optical signal is exported to external environment condition by other m-1 output of the 3rd optical demultiplexer and the 4th optical demultiplexer.
The frequency interval of the multiwavelength laser in optical demultiplexer A, optical demultiplexer B, optical multiplexer and described step (1) is 50GHz or 100GHz.
High speed coherent light signal in step (4) is BPSK coherent light signal.
Advantages of the present invention:
Be capable of between star, star ground ultrahigh speed, over distance high sensitivity optic communication, for the coherent detection of pole weak signal received；
Solve laser instrument in existing wavelength-division multiplex technique ultrahigh speed inter-satellite coherent optical communication method and system, 90 degree of frequency mixers of light, photoelectricity balance detector quantity number more, the complicated problem such as relatively costly of system architecture simultaneously；
Can solve the problem that the problems such as multiple independent laser instrument exists carrier wave as light source and is difficult to coordinate synchronization, the stability difficulty control of laser optical source wavelength, live width and phase place；
The present invention utilizes optical frequency comb generator and the big shaping unit of optical frequency comb method to produce high-quality multi-wavelength auto-correlation light source, and the local oscillator light source as transmitting terminal carrier wave light source and receiving terminal can solve an above-mentioned difficult problem, and simple in construction, it is easy to promotes.
Accompanying drawing explanation
Fig. 1 is multi-wavelength auto-correlation light source generation unit block diagram；
Fig. 2 is (a) single pumping (b) double pumping action optical frequency comb optical fiber optically erasing shaping figure；
Fig. 3 is ultrahigh speed coherent light signal generation unit FB(flow block)；
Fig. 4 is to receive unit block diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be described:
The system of ultrahigh speed spatial coherence optic communication based on optical frequency comb, including multi-wavelength auto-correlation light source generation unit, ultrahigh speed coherent light signal generation unit and reception unit；
(1) multi-wavelength auto-correlation light source generation unit
As it is shown in figure 1, multi-wavelength auto-correlation light source generation unit includes that the laser instrument, optical frequency comb generator and the optical frequency comb that are sequentially connected amplify shaping unit；
Frequency is f by laser instrumentiSingle wavelength laser send to optical frequency comb generator be converted to Phase synchronization, frequency interval fixes the multiwavelength laser of Δ f (50GHz), wave-length coverage covers C-band (1530nm-1565nm can cover 80 subchannels), owing to the luminous power of multiwavelength laser produced is with frequency fiCentered by successively decrease to two sides, and send to optical frequency comb amplify shaping unit；In optical frequency comb amplifies shaping unit, by improve optical frequency comb flatness and signal to noise ratio after optical frequency comb is carried out in highly nonlinear optical fiber (HNLF) the amplification shaping of phase sensitive or phase-unsensitive Fiber-optic parameter amplification process, m the frequency power that optical frequency comb is corresponding is amplified as essentially identical, as shown in Fig. 2 (a), after single pumping optical fiber parameter amplification, the power of m the frequency that optical frequency comb is corresponding is amplified as of substantially equal by entirety, and optical frequency comb flatness is greatly improved.As shown in Fig. 2 (b), m the power that after the amplification of double pumping action Fiber-optic parameter, optical frequency comb is corresponding is amplified as essentially identical by entirety, is spaced according to double pumping action optical position simultaneously, and the spectral width that optical frequency comb covers can further be adjusted.
Utilize phase sensitive Fiber-optic parameter structure for amplifying to need flashlight, pump light, ideler frequency light and carry out PGC demodulation, amplify the optical frequency comb OSNR lifting 6dB that the ratio phase-unsensitive Fiber-optic parameter structure for amplifying after shaping produces.By optical fiber optically erasing process, optical frequency comb is amplified shaping, obtain phase locked m the multi-wavelength relevant source that m side frequency interval delta f (50GHz) high flat degree, high OSNR, spectral width are controlled, and multiwavelength laser is sent to optical demultiplexer；
(2) ultrahigh speed coherent light signal generation unit
As it is shown on figure 3, multiwavelength laser is that to be demultiplexing as m frequency interval be that Δ f (50GHz) frequency is respectively f to Δ f (50GHz) Wave decomposing multiplexer by frequency interval by optical demultiplexer A1、f2…、fi-1、fi、fi+1、…、fmLaser as carrier wave light source and send to corresponding high speed lithium niobate (LiNbO3) electrooptic modulator；If the input of electrooptic modulator isThen it is output asWherein, VπFor half-wave voltage, under this voltage effect, the phase place of light wave is changed to π, when modulation voltage V (t) is bi-level signal, can realize BPSK High Speed Modulation.The laser of m road multi-wavelength and the telex network signal of telecommunication at a high speed are modulated to BPSK high speed coherent light signal and send to optical multiplexer；Speed that multi-wavelength high speed BPSK coherent light signal high speed coherent light signal optical multiplexer be multiplexed with is multiplied by the ultrahigh speed coherent light signal of m times, and passes sequentially through image intensifer, optical transmitting antenna transmission to space.
BPSK modulation technique is applied in high rate data transmission communication system, and the phase place of carrier wave is modulated by the phase information utilizing modulated signal to carry, and code element " 1 " and " 0 " are represented by generally acquiescence with 0 and π.Therefore, being expressed as of bpsk signal
eBPSK(t)=A cos (ω0t+φn),
In formula, φnRepresent the absolute phase of nth symbol.
(3) ultrahigh speed coherent signal receives unit
The ultrahigh speed coherent light signal that optical antenna receives, become homophase and four orthogonal road signals with coherent demodulation in the local oscillator light source input 90 degree of frequency mixers of light produced based on optical frequency comb generator, utilize four Wave decomposing multiplexers to be converted into four road multi-wavelengths and be correlated with high speed coherent light signal.Then by two groups of photoelectricity balanced detector, the signal of telecommunication of same-phase and quadrature phase it is converted into respectively.In-phase signal corresponding to centre wavelength is divided into two parts, after the part quadrature phase signal of telecommunication corresponding with centre wavelength enters multiplier, obtains phase error signal, and as the control input signal of decision-feedback phaselocked loop, control local oscillator light source has gone light phase-locked.Another part carries out the data decision recovery high-speed communication signal of telecommunication respectively with the in-phase signal of other wavelength.The orthogonal signalling that other wavelength are corresponding export to external environment condition.
Specific as follows:
Local oscillator light source cell provides the multi-wavelength local oscillator light corresponding with optical signal to 90 degree of frequency mixers of light, the ultrahigh speed coherent light signal received is demodulated into phase place respectively homophase 0 °, 180 ° and orthogonal 90 °, 270 ° tetra-tunnel ultrahigh speeds mixing optical signals and the ultrahigh speed that phase place is 0 °, 180 °, 90 ° and 270 ° is mixed optical signal is respectively sent to the first optical demultiplexer, the second optical demultiplexer, the 3rd optical demultiplexer and the 4th optical demultiplexer；
nullAs shown in Figure 4，Above-mentioned ultrahigh speed coherent light signal is through being received by space station (or earth station) optical antenna space after (or star ground) long range propagation between star，The local oscillator light source cell produced with above-mentioned (1) identical structure provides the multi-wavelength local oscillator light corresponding with optical signal to 90 degree of frequency mixers of light，It is input in 90 degree of frequency mixers carry out the coherent demodulation of ultrahigh speed BPSK optical signal becomes phase place be respectively homophase 0 °、180 ° and orthogonal 90 °、270 ° of four tunnel ultrahigh speed mixing optical signal，Four road optical signals are the first optical demultiplexer that Δ f (50GHz) includes m output by four frequency intervals respectively、Second optical demultiplexer、3rd optical demultiplexer and the 4th optical demultiplexer are demodulated to four tunnels and comprise the optical signal f that the high speed multi-wavelength that m frequency interval is Δ f (50GHz) synchronizes respectively1、f2…、fi-1、fi、fi+1、…、fm。
Homophase ultrahigh speed mixing optical signal is demultiplexing as m independent homophase mixing optical signal at a high speed by the first optical demultiplexer and the second optical demultiplexer, and is sent to the first balanced detector by corresponding output；Wherein road homophase mixing optical signal at a high speed is divided into two: one to enter signal of communication process branch road, and another enters optical phase-locked loop branch road, and the homophase on other roads mixing optical signal at a high speed all enters signal of communication and processes branch road.
Homophase mixing optical signal at a high speed is handled as follows:
Such as Fig. 4, it is f by an output of the first optical demultiplexer and an output of the second optical demultiplexer by frequencyiHomophase at a high speed mixing optical signal send to the first balanced detector；Homophase mixing optical signal at a high speed is converted to the homophase mixing signal of telecommunication at a high speed and sends to power splitter by the first balanced detector；The homophase mixing signal of telecommunication at a high speed is sent to multiplier by power splitter by the first output；By the second output, to wave filter, homophase mixing signal of telecommunication transmission at a high speed is carried out filter to make an uproar, be then reduced into the original high-speed communication signal of telecommunication by clock recovery system；
Other comprise m-1 frequency is f1、f2…、fi-1、fi+1、…、fmHomophase at a high speed mixing optical signal sent to the first balanced detector by other outputs of the first optical demultiplexer and other outputs of the second optical demultiplexer；Homophase at a high speed mixing optical signal is converted to the homophase mixing signal of telecommunication at a high speed, is sent directly to wave filter and carries out filter and make an uproar by the first balanced detector, is then reduced into m-1 the original high-speed communication signal of telecommunication by clock recovery system；
Orthogonal ultrahigh speed mixing optical signal is demultiplexing as m independent orthogonal high speed mixing optical signal by the 3rd optical demultiplexer and the 4th optical demultiplexer, and is f by an output of the 3rd optical demultiplexer and an output of the 4th optical demultiplexer by frequencyiOrthogonal high speed mixing optical signal send to the second balanced detector, orthogonal high speed mixing optical signal is converted to the orthogonal high speed mixing signal of telecommunication by the second balanced detector, is then forwarded to multiplier；
Multiplier extracts the phase error information of the signal of telecommunication received and sends phase error information to phase locking unit, as the control input signal of decision-feedback phaselocked loop, phase locking unit controls local oscillator light source cell according to phase error information tuning and carries out genlocing with the phase place inputting the optical signal to 90 degree of frequency mixers of light.
Owing between wavelength, correlation m-1 signal need not again multi-wavelength local oscillator radiant be carried out phase-locked control, and by frequency fiPhase-locked local oscillator radiant and m-1 optical signal keep Phase synchronization, so other branch road road orthogonal signalling are without phase-locked control respectively, are directly output to external environment condition, greatly simplify the system architecture of receiving terminal.
Claims (9)
1. the system of ultrahigh speed spatial coherence optic communication based on optical frequency comb, it is characterised in that:
Including multi-wavelength auto-correlation light source generation unit, ultrahigh speed coherent light signal generation unit and reception
Unit；
Multi-wavelength auto-correlation light source generation unit includes that the laser instrument being sequentially connected, optical frequency comb produce
Raw device and optical frequency comb amplify shaping unit；Laser instrument is for providing single to optical frequency comb generator
Wavelength laser source, optical frequency comb generator is for being converted to phase locked by Single wavelength laser
Multiple wavelength laser light source；
Ultrahigh speed coherent light signal generation unit include optical demultiplexer A, electrooptic modulator group,
Optical multiplexer, image intensifer and optical transmitting antenna, electrooptic modulator group includes m electric light
Modulator；
Receive unit include optical receiver antenna, 90 degree of frequency mixers of light, optical demultiplexer B,
Local oscillator light source cell, optical phase-locked loop branch road and m signal of communication process branch road；
Optical demultiplexer A includes m of m output, m output and user at a high speed
The signal of telecommunication input respectively with described m electrooptic modulator that communicates is connected；
The output of m electrooptic modulator is all connected with the input of optical multiplexer, optical multiplexer
Output be connected with optical transmitting antenna by image intensifer, optical transmitting antenna passes through air
Channel is connected with optical receiver antenna and 90 degree of frequency mixers of light successively；
Signal of communication processes branch road and includes 1 branch road A and m-1 bar branch road B；Branch road A bag
Include the first balanced detector, power splitter, wave filter and clock recovery unit；Power splitter is 1 × 2
Power splitter；Branch road B includes the first balanced detector, wave filter and clock recovery unit；
The second balanced detector that described optical phase-locked loop branch road includes being sequentially connected, multiplier,
Phase locking unit, frescan and Doppler compensator；Doppler compensator and described local oscillator light source list
Unit is connected；
In described branch road A, the first balanced detector is connected with the input of power splitter, and merit is divided
Two outputs of device are respectively the first output and the second output, the first output and multiplication
Device is connected, and the second output is connected with clock recovery unit by wave filter；In branch road B,
First balanced detector is connected with clock recovery unit by wave filter；
Described optical demultiplexer B has 4, the respectively first optical demultiplexer, the second photodissociation
Multiplexer, the 3rd optical demultiplexer and the 4th optical demultiplexer；
Optical receiver antenna for being coupled into 90 degree of frequency mixers of light by optical signal；Local oscillator light source list
Unit is connected with 90 degree of frequency mixers of light, for providing corresponding with optical signal to 90 degree of frequency mixers of light
Local oscillator light；
90 degree of frequency mixers of light are for being that phase place is respectively homophase by the optical signal demodulation received
0 °, 180 ° and orthogonal 90 °, 270 ° of four tunnel ultrahigh speed mixing optical signal and by phase place be 0 °,
180 °, 90 ° and 270 ° ultrahigh speed mixing optical signal be respectively sent to the first optical demultiplexer,
Second optical demultiplexer, the 3rd optical demultiplexer and the 4th optical demultiplexer；
Optical demultiplexer B includes that m output, the first optical demultiplexer and the second light demultiplex
The first balanced detector of branch road is processed with m signal of communication respectively with m output of device
It is connected；
One output of the 3rd optical demultiplexer and an output of the 4th optical demultiplexer
It is connected with described second balanced detector respectively；
Other outputs of 3rd optical demultiplexer and the 4th optical demultiplexer are for by corresponding
Optical signal exports to external environment condition.
System the most according to claim 1, it is characterised in that: described optical frequency comb is put
Big shaping unit is amplification shaping unit based on phase sensitive or phase-unsensitive Fiber-optic parameter.
System the most according to claim 2, it is characterised in that: described electrooptic modulator
For lithium niobate electrooptic modulator or InP-base semi-conductor electricity optical modulator.
System the most according to claim 3, it is characterised in that: described wave filter is low
Passband wave filter.
System the most according to claim 4, it is characterised in that: described optical multiplexer is
Wavelength division multiplexer.
6. according to the arbitrary described system of claim 1 to 5, it is characterised in that: local oscillator light
The structure of source unit is identical with the structure of multi-wavelength auto-correlation light source generation unit；Described Doppler
Compensator is connected with the laser instrument of local oscillator light source cell, is used for compensating ultrahigh speed coherent light signal and produces
The Doppler effect that between raw unit and reception unit, relative motion produces；Local oscillator light source cell
Optical frequency comb amplifies 90 degree of frequency mixers of shaping unit and light and is connected.
7. utilize the arbitrary described system of claim 1 to 6 to realize ultrahigh speed spatially coherent light
The method of communication, it is characterised in that comprise the following steps:
(1) it is f by frequencyiSingle wavelength laser be converted to phase locked multiwavelength laser；Its
In, multiwavelength laser includes the laser of m wavelength；
(2) power of multiwavelength laser carries out the multi-wavelength that entirety zooms into power equal swash
Light；
(3) multiwavelength laser obtained through step (2) is demultiplexing as m individual independent
Laser；
(4) the high-speed communication signal of telecommunication of user being loaded into corresponding Laser Modulation is high speed phase
Dry optical signal；
(5) high speed coherent light signal is multiplexed with ultrahigh speed coherent light signal, then passes through light
Amplifier is connect by reception antenna after being transmitted by transmitting antenna entrance atmospheric channel after amplifying
Receiving and send to 90 degree of frequency mixers of light, local oscillator light source cell is defeated to 90 degree of frequency mixers of light simultaneously
Enter local oscillator light；Then the optical signal demodulation received is that phase place is respectively by 90 degree of frequency mixers of light
0 ° of homophase, 180 ° and orthogonal 90 °, 270 ° tetra-tunnel ultrahigh speeds mixing optical signals are also incited somebody to action
Phase place is that the ultrahigh speed mixing optical signal of 0 °, 180 °, 90 ° and 270 ° is respectively sent to the first light
Demultiplexer, the second optical demultiplexer, the 3rd optical demultiplexer and the 4th optical demultiplexer；
(6) first optical demultiplexer and the second optical demultiplexer are by homophase ultrahigh speed mixing light letter
Number it is demultiplexing as m independent homophase mixing optical signal at a high speed, then to homophase mixing at a high speed
Optical signal is handled as follows:
One by an output of the first optical demultiplexer and the second optical demultiplexer defeated
Going out end is f by frequencyiHomophase at a high speed mixing optical signal send to the first balanced detector；First
Homophase at a high speed mixing optical signal is converted to the homophase mixing signal of telecommunication at a high speed, concurrent by balanced detector
Deliver to power splitter；The homophase mixing signal of telecommunication at a high speed is sent to taking advantage of by power splitter by the first output
Musical instruments used in a Buddhist or Taoist mass；By the second output, homophase mixing signal of telecommunication transmission at a high speed is filtered to wave filter
Make an uproar, be then reduced into the original high-speed communication signal of telecommunication by clock recovery system；
Other comprise m-1 frequency is f1、f2…、fi-1、fi+1、…、fmHomophase at a high speed
Mixing optical signal is by other outputs of the first optical demultiplexer and the second optical demultiplexer
Other outputs send to the first balanced detector；First balanced detector is by homophase mixing at a high speed
Optical signal is converted to the homophase at a high speed mixing signal of telecommunication, is sent directly to wave filter and carries out filter and make an uproar, so
It is reduced into m-1 the original high-speed communication signal of telecommunication afterwards by clock recovery system；
Orthogonal ultrahigh speed is mixed optical signal solution by the 3rd optical demultiplexer and the 4th optical demultiplexer
It is multiplexed with m independent orthogonal high speed mixing optical signal, and by the 3rd optical demultiplexer
Frequency is f by one output of one output and the 4th optical demultiplexeriOrthogonal high speed
Mixing optical signal sends to the second balanced detector, and orthogonal high speed is mixed by the second balanced detector
Optical signal is converted to the orthogonal high speed mixing signal of telecommunication, is then forwarded to multiplier；
Multiplier extracts the phase error information of the signal of telecommunication received and by phase error information
Sending to phase locking unit, phase locking unit controls local oscillator light source cell according to phase error information tuning
Genlocing is carried out with the phase place of the optical signal of input to 90 degree of frequency mixers of light；
Other m-1 output of 3rd optical demultiplexer and the 4th optical demultiplexer will be corresponding
Optical signal export to external environment condition.
Method the most according to claim 7, it is characterised in that
In optical demultiplexer A, optical demultiplexer B, optical multiplexer and described step (1)
The frequency interval of multiwavelength laser be 50GHz or 100GHz.
9. according to the method described in claim 7 or 8, it is characterised in that in step (4)
High speed coherent light signal be BPSK coherent light signal.
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| CN111800197A (en) * | 2020-05-12 | 2020-10-20 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Simplified wavelength division multiplexing coherent optical communication system based on frequency comb light source |
| CN112799464A (en) * | 2021-04-01 | 2021-05-14 | 中国科学院西安光学精密机械研究所 | Matrix vector multiplier based on multi-wavelength light source and operation method thereof |
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| CN114430298A (en) * | 2021-11-25 | 2022-05-03 | 中国科学院西安光学精密机械研究所 | Multi-system compatible space laser communication method and system based on direct modulation |
| WO2023093856A1 (en) * | 2021-11-25 | 2023-06-01 | 中国科学院西安光学精密机械研究所 | Multi-system compatible space laser communication method and system based on direct modulation |
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| CN115133991A (en) * | 2022-08-31 | 2022-09-30 | 湖南汇思光电科技有限公司 | Multichannel free space optical communication system |
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