CN105871499B - Ultrahigh speed spatial coherence optical communication method and system based on optical frequency comb - Google Patents
Ultrahigh speed spatial coherence optical communication method and system based on optical frequency comb Download PDFInfo
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- CN105871499B CN105871499B CN201610153188.2A CN201610153188A CN105871499B CN 105871499 B CN105871499 B CN 105871499B CN 201610153188 A CN201610153188 A CN 201610153188A CN 105871499 B CN105871499 B CN 105871499B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0213—Groups of channels or wave bands arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
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Abstract
The invention discloses a kind of ultrahigh speed spatial coherence optical communication methods and system based on optical frequency comb.This method generates multi-wavelength auto-correlation light source first with optical frequency comb generator and optical frequency comb amplification shaping unit, multipath high-speed communication electric signal is modulated to above-mentioned light source and forms multi-wavelength auto-correlation high speed binary phase shift keying (BPSK) coherent light signal, ultra high-speed optical signal is multiplexed into using wavelength division multiplexer, emitted by optical antenna Space Coupling, by between star, unit be received to star after long range space propagation receive.The problems such as present invention solves multiple independent lasers there are carrier waves to be not easy coordinate synchronization as light source, and the stability of receiving terminal laser optical source wavelength, line width and phase is difficult to control, and it is simple in structure, reduce popularization difficulty.
Description
Technical field
The invention belongs to laser space communication fields.It is related to laser space communication system ultra high speed signal to generate and phase stem grafting
The implementation method of receipts.
Background technology
Laser space communication is due to having many advantages, such as small big message capacity, good directionality, size, volume and small power consumption, mesh
The preceding important subject for having become space communication field.With the explosive increase of satellite data, for high-speed, long range
Star between, star ground optical communication system, the technological means combined using higher order modulation formats and light multiplexing mode has been become to be had very much
The solution of effect.Existing laser space communication is mostly communicated by the way of intensity modulated, direct detection, and light wave exists
When being propagated in space, due to being influenced by stray lights such as daylight, moonlight, starlight, air and seawaters, pressed from both sides in detectable signal
Miscellaneous very strong ambient noise will increase the bit error rate of communication, and reduce communication quality.
Coherent light communication system has extremely strong wavelength selectivity, is multiplexed using frequency-domain multi-channel and improves traffic rate,
It is to realize superelevation rate communication effective means.Wavelength selectivity, that is, narrow-band filtering characteristic causes coherent communication machine to wide band background light
Sensitivity substantially reduce, influenced by sun background, earth background and other starlight backgrounds minimum.German laser communication is whole
TerraSAR-X is held to carry the laser communication terminal that a traffic rate is 5.625Gbps binary phase shift keyings (BPSK) modulation
(LTC), Space laser communications and satellite-ground laser communication, and the data in real-time Transmission synthetic aperture radar are realized.Experiment proves
Compared to the laser communication system of intensity modulated direct detection, the receiving sensitivity of system improves to best coherent optical communication system
Detectivity 10-9Error rate condition under, 9 photon/bit support to transmit, and make communication matter to star between the star of long range
Amount significantly increases, efficiently solve between star, star long range satellite communication detectivity bottleneck problem.
Wavelength-division multiplex (WDM) technology refers to that the electric signal of multichannel is loaded by Electro-optical Modulation on the light wave of different wave length,
Optical signal again by wave multiplexer it is compound after, pass through same link transmit a kind of communication technology.Wavelength-division multiplex technique makes full use of
Laser communication bandwidth, effectively improves information rate and channel capacity.Wavelength-division multiplex technique is answered as a kind of simple and ripe
The information capacity bottleneck problem of space communication is solved, it can be achieved that mass data transfers, are attacked in space information network, information with technology
Important and unique effect is played in anti-and Space Target Surveillance, is a kind of communication mode of great prospect.
In the coherent reception system of wavelength-division multiplex, high performance coherent detection system needs signal laser source and local oscillator to swash
Light source should have high stability and stringent relative phase relation to ensure the coherence of two light fields, this is coherent detection
One of difficult point and key technology of technology.Traditional multichannel light source is laser array, for each wavelength channel, all will
Data-signal is modulated as light source using a laser, while the co-wavelength of identical quantity can be used to swash in receiving terminal
Light device, 90 degree of frequency mixers of light, photoelectricity balanced detector and the process of optical signal progress coherent demodulation completion reception received.Mesh
In preceding existing program, the light source that each wavelength channel is required for two wavelength identical completes the function of sending and receiving, and greatly increases
Demand of the whole system to number of lasers is added, receiving terminal also needs multiple 90 degree of frequency mixers of light, photoelectricity balanced detector, exists
The shortcomings of system structure is complicated, and cost is higher.In addition, multiple independent lasers are not easy to coordinate together as light source there are carrier wave
Step, the stability of receiving terminal laser optical source wavelength, line width and phase significantly limit the performance of its coherent reception, become hair
Open up ultrahigh speed, the technical bottleneck of highly sensitive spatial coherence optic communication.
Invention content
In the spatial coherence optical communication system of phase-modulation, the local oscillator laser of transmitting terminal laser light source and receiving terminal
Light source needs multiple independent lasers, and as light source, there are carrier waves to be not easy coordinate synchronization, laser optical source wavelength, line width and phase
The problems such as stability of position is difficult to control.Meanwhile receiving terminal is to input to be done by noise from receiving terminal using the function of optical phase-locked loop
Regenerating phase in the reception signal disturbed, tracking signal light phase change with time, and tuning control local oscillator laser swashs with signal
The phase of light device is locked, to realize phase coherence coherent demodulation in 90 degree of frequency mixers of local oscillator light and flashlight.
In satellite communication system, BPSK photoreceivers carry out phase controlling with Phase Tracking in high rail using phase locking unit
Coherent light communication between satellite since the relative motion between satellite communication object generates Doppler effect, and leads to flashlight
Difference on the frequency with local oscillator light is a random value, rather than the fixed value that demodulation needs.It so must be to being transported since satellite is opposite
Doppler frequency shift caused by dynamic carries out Doppler frequency shift in real time to estimate and compensate by frescan and frequency compensator.
The shortcomings that it is an object of the invention to overcome the above-mentioned prior art, it is empty to provide a kind of ultrahigh speed based on optical frequency comb
Between optical communication method and system, this method is based on optical frequency comb generator and the big shaping unit of optical frequency comb method generate high quality from
Relevant source produces the phase locked laser light source of multi-wavelength, for the generation of ultrahigh speed space optical communication system signal and Gao Ling
The offer effective ways of sensitivity weak signal coherent reception.
The technical solution 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：Including multi-wavelength auto-correlation
Light source generates unit, ultrahigh speed coherent light signal generates unit and receiving unit；
Multi-wavelength auto-correlation light source generates unit and includes the laser, optical frequency comb generator and the optical frequency comb that are sequentially connected
Amplify shaping unit；Laser is used to provide Single wavelength laser light source to optical frequency comb generator, and optical frequency comb generator is used for
Single wavelength laser is converted into phase locked multiple wavelength laser light source；Optical frequency comb amplifies shaping unit by multiwavelength laser light
The power in source, which is amplified, is shaped as the equal multiwavelength laser of power；
Ultrahigh speed coherent light signal generates unit and includes optical demultiplexer A, electrooptic modulator group, optical multiplexer, light amplification
Device and optical transmitting antenna, electrooptic modulator group include m electrooptic modulator；
Receiving unit includes optical receiver antenna, 90 degree of frequency mixers of light, optical demultiplexer B, local oscillator light source unit, optics lock
Phase ring branch and m signal of communication processing branch；
Optical demultiplexer A includes m output terminal, the m high-speed communication electric signal of m output terminal and user respectively with it is described
The input terminal of m electrooptic modulator is connected；M electrooptic modulator exports m high speed coherent light signal；
The output terminal of m electrooptic modulator is connected with the input terminal of optical multiplexer, and the output terminal of optical multiplexer passes through light
Amplifier is connected with optical transmitting antenna, and optical transmitting antenna is mixed with 90 degree of optical receiver antenna and light successively by atmospheric channel
Frequency device is connected；
Wherein, the user of corresponding laser and high speed communication electric signal is modulated to high speed coherent light letter by electrooptic modulator
Number and be sent to optical multiplexer；High speed coherent light signal is multiplexed with ultrahigh speed coherent light signal by optical multiplexer, and is passed sequentially through
Image intensifer, optical transmitting antenna are sent to space, through between the star of long-distance, transmit to star after received by optical receiver antenna
And it is sent to 90 degree of frequency mixers of light；
M signal of communication processing branch includes 1 branch A and m-1 branch B, branch A include the first balanced detector,
Power splitter, wave filter and clock recovery unit；Power splitter is 1 × 2 power splitter；Branch B includes the first balanced detector, wave filter
And clock recovery unit；
The optical phase-locked loop branch includes the second balanced detector, multiplier, phase locking unit, the frescan that are sequentially connected
And Doppler compensator；Doppler compensator is connected with the local oscillator light source unit；
In the branch A, the first balanced detector is connected with the input terminal of power splitter, two output terminals difference of power splitter
For the first output terminal and second output terminal, the first output terminal is connected with multiplier, and second output terminal is extensive with clock by wave filter
Multiple unit is connected；In branch B, the first balanced detector is connected by wave filter with clock recovery unit；
The optical demultiplexer B has 4, respectively the first optical demultiplexer, the second optical demultiplexer, third Optical Demultiplexing
Device and the 4th optical demultiplexer；
Optical receiver antenna is used to optical signal coupling 90 degree of frequency mixers of entering light；Local oscillator light source unit and 90 degree of frequency mixers of light
It is connected, for providing local oscillator light corresponding with optical signal to 90 degree of frequency mixers of light；
90 degree of frequency mixers of light be used for by the optical signal demodulation that receives for phase be respectively with 0 °, 180 ° of phase and it is 90 ° orthogonal,
The ultrahigh speed that phase is 0 °, 180 °, 90 ° and 270 ° is simultaneously mixed optical signal difference by 270 °, tetra- tunnel ultrahigh speed mixing optical signals
It is sent to the first optical demultiplexer, the second optical demultiplexer, third optical demultiplexer and the 4th optical demultiplexer；
Optical demultiplexer B includes the m output terminal point of m output terminal, the first optical demultiplexer and the second optical demultiplexer
The first balanced detector not with m signal of communication processing branch is connected；
One output terminal of third optical demultiplexer and an output terminal of the 4th optical demultiplexer are respectively with described second
Balanced detector is connected.
Other output terminals of third optical demultiplexer and the 4th optical demultiplexer are used to export corresponding optical signal to outer
Portion's environment.
Above-mentioned optical frequency comb amplification shaping unit is the amplification shaping based on phase sensitive or phase-unsensitive Fiber-optic parameter
Unit.
Above-mentioned electrooptic modulator be 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 that the structure of above-mentioned local oscillator light source unit generates unit with multi-wavelength auto-correlation light source is identical；The Doppler
Compensator is connected with the laser of local oscillator light source unit, for compensate ultrahigh speed coherent light signal generate unit and receiving unit it
Between relative motion generate Doppler effect；Optical frequency comb amplification 90 degree of frequency mixer phases of shaping unit and light of local oscillator light source unit
Even.
The method that ultrahigh speed spatial coherence optic communication is realized using above system, is included the following steps：
(1) it is f by frequencyiSingle wavelength laser be converted to phase locked multiwavelength laser；Wherein, multiwavelength laser packet
Include the laser of m wavelength；
(2) power of multiwavelength laser is subjected to the equal multiwavelength laser of whole amplification success rate；
(3) m independent laser will be demultiplexing as by the multiwavelength laser that step (2) obtains；
(4) the high-speed communication electric signal of user is loaded into corresponding Laser Modulation as high speed coherent light signal；
(5) high speed coherent light signal is multiplexed with ultrahigh speed coherent light signal, passed through after then being amplified by image intensifer
Transmitting antenna, which enters, by reception antenna is received and is sent to 90 degree of frequency mixers of light, while local oscillator light after atmospheric channel is transmitted
Source unit inputs local oscillator light to 90 degree of frequency mixers of light；Then 90 degree of frequency mixers of light distinguish the optical signal demodulation received for phase
0 °, 180 ° and orthogonal 90 ° for same phase, 270 °, tetra- tunnel ultrahigh speed mixing optical signals and by phase be 0 °, 180 °, 90 ° and
270 ° of ultrahigh speed mixing optical signal is respectively sent to the first optical demultiplexer, the second optical demultiplexer, third optical demultiplexer
With the 4th optical demultiplexer；
(6) first optical demultiplexers and the second optical demultiplexer will be mixed optical signal with phase ultrahigh speed and be demultiplexing as m solely
Vertical same phase is mixed at a high speed optical signal, and then to same phase, mixing optical signal is handled as follows at a high speed：
By frequency it is f by an output terminal of the first optical demultiplexer and an output terminal of the second optical demultiplexeri
Same phase at a high speed mixing optical signal be sent to the first balanced detector；First balanced detector will be the same as mutually mixing optical signal turns at a high speed
It is changed to mutually high speed mixing electric signal and is sent to power splitter；Power splitter will be the same as mutually high speed mixing telecommunications by the first output terminal
Number it is sent to multiplier；By second output terminal by with mutually at a high speed mixing electric signal be sent to wave filter carry out filter make an uproar, Ran Houtong
Oversampling clock recovery system is reduced into original high-speed communication electric signal；
It is f that other, which include m-1 frequency,1、f2…、fi-1、fi+1、…、fmSame phase at a high speed mixing optical signal pass through the first light
Other output terminals of demultiplexer and other output terminals of the second optical demultiplexer are sent to the first balanced detector；First balance
Detector by with mutually at a high speed mixing optical signal be converted to mutually at a high speed mixing electric signal, be sent directly to wave filter carry out filter make an uproar,
Then m-1 original high-speed communication electric signal is reduced by clock recovery system；
Third optical demultiplexer and the 4th optical demultiplexer by orthogonal ultrahigh speed mixing optical signal be demultiplexing as m it is independent
Orthogonal high speed is mixed optical signal, and passes through an output terminal of third optical demultiplexer and an output of the 4th optical demultiplexer
Frequency is f by endiOrthogonal high speed mixing optical signal be sent to the second balanced detector, the second balanced detector is by orthogonal high speed
Mixing optical signal is converted to orthogonal high speed mixing electric signal, is then forwarded to multiplier；
Multiplier extracts the phase error information of electric signal received and phase error information is sent to lock mutually list
Member, phase locking unit tune control local oscillator light source unit according to phase error information and are input to the optical signal of 90 degree of frequency mixers of light
Phase synchronizes locking；
Other m-1 output terminal of third optical demultiplexer and the 4th optical demultiplexer export corresponding optical signal to outer
Portion's environment.
Optical demultiplexer A, optical demultiplexer B, optical multiplexer and the multiwavelength laser in the step (1) frequency between
It is divided into 50GHz or 100GHz.
High speed coherent light signal in step (4) is BPSK coherent light signals.
Advantages of the present invention：
Can realize between star, star ultrahigh speed, extra long distance highly sensitive optic communication, for the pole weak signal received
Coherent detection；
Solve laser, light 90 in existing wavelength-division multiplex technique ultrahigh speed inter-satellite coherent optical communication method and system simultaneously
Spend the problems such as frequency mixer, photoelectricity balance detector quantity number are more, and system structure complexity cost is higher；
It can solve multiple independent lasers and be not easy coordinate synchronization there are carrier wave as light source, laser optical source wavelength,
The problems such as stability of line width and phase is difficult to control；
The present invention generates high quality multi-wavelength auto-correlation using optical frequency comb generator and the big shaping unit of optical frequency comb method
Light source, the local oscillator light source as transmitting terminal carrier wave light source and receiving terminal can solve above-mentioned problem, and simple in structure, be easy to push away
Extensively.
Description of the drawings
Fig. 1 generates unit block diagram for multi-wavelength auto-correlation light source；
Fig. 2 singly pumps (b) double pumping action optical frequency comb optical fiber optically erasing shaping figure for (a)；
Fig. 3 is that ultrahigh speed coherent light signal generates unit flow diagram；
Fig. 4 is receiving unit block diagram.
Specific embodiment
Below in conjunction with attached drawing, the present invention will be described：
The system of ultrahigh speed spatial coherence optic communication based on optical frequency comb generates single including multi-wavelength auto-correlation light source
Member, ultrahigh speed coherent light signal generate unit and receiving unit；
(1) multi-wavelength auto-correlation light source generates unit
As shown in Figure 1, multi-wavelength auto-correlation light source, which generates unit, includes the laser, the optical frequency comb generator that are sequentially connected
Amplify shaping unit with optical frequency comb；
Frequency is f by laseriSingle wavelength laser be sent to optical frequency comb generator and be converted between Phase synchronization, frequency
Every the multiwavelength laser of fixed Δ f (50GHz), (1530nm-1565nm can cover 80 sons and lead to wave-length coverage covering C-band
Road), since the luminous power of the multiwavelength laser of generation is with frequency fiCentered on successively decrease to two sides, and be sent to optical frequency comb amplification
Shaping unit；Amplify in shaping unit in optical frequency comb, by carrying out phase in highly nonlinear optical fiber (HNLF) to optical frequency comb
Optical frequency comb flatness and signal-to-noise ratio, light are improved after the amplification shaping of position sensitivity or phase-unsensitive Fiber-optic parameter amplification process
The corresponding m frequency power of frequency comb be amplified as it is essentially identical, as shown in Fig. 2 (a), optical frequency after the amplification of single pumping optical fiber parameter
The power that rate combs corresponding m frequency is integrally amplified as of substantially equal, and optical frequency comb flatness greatly improves.Such as Fig. 2 (b)
Shown, the corresponding m power of optical frequency comb is integrally amplified as essentially identical after the amplification of double pumping action Fiber-optic parameter, while basis
Double pumping action optical position interval, the spectral width of optical frequency comb covering can be adjusted further.
It needs to carry out PGC demodulation to flashlight, pump light, ideler frequency light using phase sensitive Fiber-optic parameter enlarged structure, put
The optical frequency comb optical signal to noise ratio that ratio phase-unsensitive Fiber-optic parameter enlarged structure after big shaping generates promotes 6dB.Pass through optical fiber
Optically erasing process is amplified shaping to optical frequency comb, obtains m side frequency interval delta f (50GHz) high flat degree, height
The controllable phase locked m multi-wavelength relevant source of optical signal to noise ratio, spectral width, and multiwavelength laser is sent to photodissociation and is answered
Use device；
(2) ultrahigh speed coherent light signal generates unit
As shown in figure 3, multiwavelength laser is Δ f (50GHz) Wave decomposing multiplexer by frequency interval by optical demultiplexer A
It is respectively f that m frequency interval, which is demultiplexing as, as Δ f (50GHz) frequency1、f2…、fi-1、fi、fi+1、…、fmLaser as carry
Wave source is simultaneously sent to corresponding high speed lithium niobate (LiNbO3) electrooptic modulator；If the input of electrooptic modulator isThen
Its output isWherein, VπFor half-wave voltage, the phase change of light wave is π, modulation voltage V under the effect of this voltage
(t) for bi-level signal when, you can realize BPSK High Speed Modulations.By the user of the laser of m roads multi-wavelength and high speed communication telecommunications
It number is modulated to BPSK high speeds coherent light signal and is sent to optical multiplexer；Optical multiplexer believes multi-wavelength high speed BPSK coherent lights
Number high speed coherent light signal is multiplexed with rate and is multiplied by m times of ultrahigh speed coherent light signal, and passes sequentially through image intensifer, optics hair
It penetrates antenna and is sent to space.
BPSK modulation techniques are applied in high rate data transmission communication system, using the phase information that modulated signal carries to carrying
The phase of wave is modulated, and usually acquiescence represents symbol " 1 " and " 0 " with 0 and π.Therefore, bpsk signal is expressed as
eBPSK(t)=A cos (ω0t+φn),
In formula, φnRepresent the absolute phase of nth symbol.
(3) ultrahigh speed coherent signal receiving unit
The ultrahigh speed coherent light signal that optical antenna receives is inputted with the local oscillator light source generated based on optical frequency comb generator
Coherent demodulation Cheng Tongxiang and four orthogonal road signals in 90 degree of frequency mixers of light, it is more to be converted into four tunnels using four Wave decomposing multiplexers
Wavelength correlation high speed coherent light signal.Then by two groups of photoelectricity balanced detectors, it is converted into same-phase and quadrature phase respectively
Electric signal.The corresponding in-phase signal of centre wavelength is divided into two parts, part quadrature phase telecommunications corresponding with centre wavelength
After number entering multiplier, phase error signal is obtained, as the control input signal of decision-feedback phaselocked loop, controls local oscillator light source
It goes to complete light lock phase.The in-phase signal of another part and other wavelength carries out data decision and restores high-speed communication electric signal respectively.
The corresponding orthogonal signalling of other wavelength are exported to external environment.
It is specific as follows：
Local oscillator light source unit provides multi-wavelength local oscillator light corresponding with optical signal to 90 degree of frequency mixers of light, super by what is received
It is respectively with 0 °, 180 ° of phase and 90 ° orthogonal, 270 °, tetra- tunnel ultrahigh speed mixing light letters that high speed coherent light signal, which is demodulated into phase,
Number and by phase be 0 °, 180 °, 90 ° and 270 ° ultrahigh speed be mixed optical signal be respectively sent to the first optical demultiplexer, second
Optical demultiplexer, third optical demultiplexer and the 4th optical demultiplexer；
As shown in figure 4, above-mentioned ultrahigh speed coherent light signal after (or star) long distance transmission between star by space station (or
Earth station) optical antenna space receives, and the local oscillator light source unit that identical with above-mentioned (1) structure generates is to 90 degree frequency mixers offers of light
Multi-wavelength local oscillator light corresponding with optical signal is input to the coherent demodulation carried out in 90 degree of frequency mixers to ultrahigh speed BPSK optical signals
It is respectively with 0 °, 180 ° of phase and 90 ° orthogonal, 270 ° of four tunnel ultrahigh speed mixing optical signal into phase, four road optical signals are respectively by four
A frequency interval is first optical demultiplexers of the Δ f (50GHz) including m output terminal, the second optical demultiplexer, third photodissociation are answered
The high speed multi-wavelength that four tunnels are respectively Δ f (50GHz) comprising m frequency interval is demodulated to device and the 4th optical demultiplexer to synchronize
Optical signal f1、f2…、fi-1、fi、fi+1、…、fm。
First optical demultiplexer and the second optical demultiplexer by same phase ultrahigh speed mixing optical signal be demultiplexing as m it is independent
With mutually high speed mixing optical signal, and pass through corresponding output terminal and be sent to the first balanced detector；Wherein all the way with mutually mixed at a high speed
Frequency optical signal is divided into two：One enter signal of communication handle branch, another enter optical phase-locked loop branch, other roads it is same
Mutually mixing optical signal enters signal of communication processing branch at a high speed.
To same phase, mixing optical signal is handled as follows at a high speed：
Such as Fig. 4, an output terminal of an output terminal and the second optical demultiplexer by the first optical demultiplexer will frequency
Rate is fiSame phase at a high speed mixing optical signal be sent to the first balanced detector；First balanced detector will be the same as mutually high speed mixing light
Signal is converted to mutually high speed mixing electric signal and is sent to power splitter；Power splitter will be the same as mutually mixed at a high speed by the first output terminal
Frequency electric signal is sent to multiplier；By second output terminal by with mutually at a high speed mixing electric signal be sent to wave filter carry out filter make an uproar,
Then original high-speed communication electric signal is reduced by clock recovery system；
It is f that other, which include m-1 frequency,1、f2…、fi-1、fi+1、…、fmSame phase at a high speed mixing optical signal pass through the first light
Other output terminals of demultiplexer and other output terminals of the second optical demultiplexer are sent to the first balanced detector；First balance
Detector by with mutually at a high speed mixing optical signal be converted to mutually at a high speed mixing electric signal, be sent directly to wave filter carry out filter make an uproar,
Then m-1 original high-speed communication electric signal is reduced by clock recovery system；
Third optical demultiplexer and the 4th optical demultiplexer by orthogonal ultrahigh speed mixing optical signal be demultiplexing as m it is independent
Orthogonal high speed is mixed optical signal, and passes through an output terminal of third optical demultiplexer and an output of the 4th optical demultiplexer
Frequency is f by endiOrthogonal high speed mixing optical signal be sent to the second balanced detector, the second balanced detector is by orthogonal high speed
Mixing optical signal is converted to orthogonal high speed mixing electric signal, is then forwarded to multiplier；
Multiplier extracts the phase error information of electric signal received and phase error information is sent to lock mutually list
Member, as the control input signal of decision-feedback phaselocked loop, phase locking unit tunes control local oscillator light source according to phase error information
Unit synchronizes locking with the phase of optical signal for being input to 90 degree of frequency mixers of light.
Since m-1 signal of correlation does not need to carry out lock phase control to multi-wavelength local oscillator radiant again between wavelength, with
By frequency fiThe local oscillator radiant and m-1 optical signal for locking phase keep Phase synchronization, so other branch road orthogonal signalling need not
Phase control is locked respectively, is directly output to external environment, greatly simplifies the system structure of receiving terminal.
Claims (8)
1. the system of the ultrahigh speed spatial coherence optic communication based on optical frequency comb, it is characterised in that：Including multi-wavelength auto-correlation light
Source generates unit, ultrahigh speed coherent light signal generates unit and receiving unit；
Multi-wavelength auto-correlation light source generates laser, optical frequency comb generator and the optical frequency comb amplification that unit includes being sequentially connected
Shaping unit；Laser is used to provide Single wavelength laser light source to optical frequency comb generator, and optical frequency comb generator is used for will be single
Wavelength laser is converted to phase locked multiple wavelength laser light source；
Ultrahigh speed coherent light signal generate unit include optical demultiplexer A, electrooptic modulator group, optical multiplexer, image intensifer and
Optical transmitting antenna, electrooptic modulator group include m electrooptic modulator；
Receiving unit includes optical receiver antenna, 90 degree of frequency mixers of light, optical demultiplexer B, local oscillator light source unit, optical phase-locked loop
Branch and m signal of communication processing branch；
Optical demultiplexer A includes m output terminal, and the m high-speed communication electric signal of m output terminal and user are a with the m respectively
The input terminal of electrooptic modulator is connected；
The output terminal of m electrooptic modulator is connected with the input terminal of optical multiplexer, and the output terminal of optical multiplexer passes through light amplification
Device is connected with optical transmitting antenna, optical transmitting antenna by atmospheric channel successively with 90 degree of frequency mixers of optical receiver antenna and light
It is connected；
M signal of communication processing branch includes 1 branch A and m-1 branch B；Branch A includes the first balanced detector, work(point
Device, wave filter and clock recovery unit；Power splitter is 1 × 2 power splitter；Branch B include the first balanced detector, wave filter and when
Clock recovery unit；
The optical phase-locked loop branch includes the second balanced detector being sequentially connected, multiplier, phase locking unit, frescan and more
General Le compensator；Doppler compensator is connected with the local oscillator light source unit；
In the branch A, the first balanced detector is connected with the input terminal of power splitter, and two output terminals of power splitter are respectively
One output terminal and second output terminal, the first output terminal are connected with multiplier, and second output terminal passes through wave filter and clock recovery list
Member is connected；In branch B, the first balanced detector is connected by wave filter with clock recovery unit；
The optical demultiplexer B has 4, respectively the first optical demultiplexer, the second optical demultiplexer, third optical demultiplexer and
4th optical demultiplexer；
Optical receiver antenna is used to optical signal coupling 90 degree of frequency mixers of entering light；90 degree of frequency mixer phases of local oscillator light source unit and light
Connect, for providing local oscillator light corresponding with optical signal to 90 degree of frequency mixers of light；
It is 0 °, 180 ° and orthogonal 90 ° of phase respectively with phase that 90 degree of frequency mixers of light, which are used for the optical signal demodulation received,
270 ° of four tunnel ultrahigh speed mixing optical signal simultaneously sends out the ultrahigh speed mixing optical signal that phase is 0 °, 180 °, 90 ° and 270 ° respectively
It send to the first optical demultiplexer, the second optical demultiplexer, third optical demultiplexer and the 4th optical demultiplexer；
Optical demultiplexer B includes m output terminal, m output terminal of the first optical demultiplexer and the second optical demultiplexer respectively with m
First balanced detector of a signal of communication processing branch is connected；
One output terminal of third optical demultiplexer and an output terminal of the 4th optical demultiplexer balance respectively with described second
Detector is connected；
Other output terminals of third optical demultiplexer and the 4th optical demultiplexer are used to export corresponding optical signal to external rings
Border；The power of multiple wavelength laser light source is amplified by optical frequency comb amplification shaping unit to be shaped as the equal multi-wavelength of power and swashs
Light；
The optical frequency comb amplification shaping unit is the amplification shaping unit based on phase sensitive or phase-unsensitive Fiber-optic parameter.
2. system according to claim 1, it is characterised in that：The electrooptic modulator for lithium niobate electrooptic modulator or
InP-base semi-conductor electricity optical modulator.
3. system according to claim 2, it is characterised in that：The wave filter is low pass frequency filters.
4. system according to claim 3, it is characterised in that：The optical multiplexer is wavelength division multiplexer.
5. system according to any one of claims 1 to 4, it is characterised in that：The structure and multi-wavelength of local oscillator light source unit are certainly
The structure that relevant source generates unit is identical；The Doppler compensator is connected with the laser of local oscillator light source unit, for mending
It repays ultrahigh speed coherent light signal and generates the Doppler effect that relative motion generates between unit and receiving unit；Local oscillator light source unit
Optical frequency comb amplification 90 degree of frequency mixers of shaping unit and light be connected.
6. the method for realizing ultrahigh speed spatial coherence optic communication using any system of claim 1 to 5, feature exist
In including the following steps：
(1) it is f by frequencyiSingle wavelength laser be converted to phase locked multiwavelength laser；Wherein, multiwavelength laser includes m
The laser of wavelength；
(2) power of multiwavelength laser is subjected to the equal multiwavelength laser of whole amplification success rate；
(3) m independent laser will be demultiplexing as by the multiwavelength laser that step (2) obtains；
(4) the high-speed communication electric signal of user is loaded into corresponding Laser Modulation as high speed coherent light signal；
(5) high speed coherent light signal is multiplexed with ultrahigh speed coherent light signal, passes through transmitting after then amplifying by image intensifer
Antenna, which enters, by reception antenna is received and is sent to 90 degree of frequency mixers of light, while local oscillator light source list after atmospheric channel is transmitted
Member inputs local oscillator light to 90 degree of frequency mixers of light；Then 90 degree of frequency mixers of light are respectively same for phase by the optical signal demodulation received
0 °, 180 ° and orthogonal 90 ° of phase, 270 °, tetra- tunnel ultrahigh speed mixing optical signals and be 0 °, 180 °, 90 ° and 270 ° by phase
Ultrahigh speed mixing optical signal be respectively sent to the first optical demultiplexer, the second optical demultiplexer, third optical demultiplexer and the
Four optical demultiplexers；
(6) first optical demultiplexers and the second optical demultiplexer by same phase ultrahigh speed mixing optical signal be demultiplexing as m it is independent
With optical signal is mutually mixed at a high speed, then to same phase, mixing optical signal is handled as follows at a high speed：
By frequency it is f by an output terminal of the first optical demultiplexer and an output terminal of the second optical demultiplexeriSame phase
Mixing optical signal is sent to the first balanced detector at a high speed；First balanced detector will be the same as mutually mixing optical signal is converted to together at a high speed
It is mutually mixed electric signal at a high speed and is sent to power splitter；Power splitter will be the same as mutually mixing electric signal is sent at a high speed by the first output terminal
To multiplier；By second output terminal by with mutually at a high speed mixing electric signal be sent to wave filter carry out filter make an uproar, then pass through clock
Recovery system is reduced into original high-speed communication electric signal；
It is f that other, which include m-1 frequency,1、f2…、fi-1、fi+1、…、fmSame phase at a high speed mixing optical signal answered by the first photodissociation
The first balanced detector is sent to other output terminals of device and other output terminals of the second optical demultiplexer；First balance detection
Device by with mutually at a high speed mixing optical signal be converted to mutually at a high speed mixing electric signal, be sent directly to wave filter carry out filter make an uproar, then
M-1 original high-speed communication electric signal is reduced by clock recovery system；
Third optical demultiplexer and the 4th optical demultiplexer by orthogonal ultrahigh speed mixing optical signal be demultiplexing as m it is independent orthogonal
Mixing optical signal at a high speed, and pass through an output terminal of third optical demultiplexer and the output terminal general of the 4th optical demultiplexer
Frequency is fiOrthogonal high speed mixing optical signal be sent to the second balanced detector, orthogonal high speed is mixed by the second balanced detector
Optical signal is converted to orthogonal high speed mixing electric signal, is then forwarded to multiplier；
Multiplier extracts the phase error information of electric signal received and phase error information is sent to phase locking unit, locks
Phase element tunes control local oscillator light source unit according to phase error information and is input to the phase of the optical signal of 90 degree of frequency mixers of light
Synchronize locking；
Other m-1 output terminal of third optical demultiplexer and the 4th optical demultiplexer export corresponding optical signal to external rings
Border.
7. according to the method described in claim 6, it is characterized in that,
Optical demultiplexer A, optical demultiplexer B, optical multiplexer and the multiwavelength laser in the step (1) frequency interval be
50GHz or 100GHz.
8. the method described according to claim 6 or 7, which is characterized in that the high speed coherent light signal in step (4) is BPSK phases
Dry optical signal.
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| CN111800197B (en) * | 2020-05-12 | 2022-09-09 | 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 |
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| CN114430298B (en) * | 2021-11-25 | 2024-01-30 | 中国科学院西安光学精密机械研究所 | Multi-standard compatible space laser communication method and system based on direct modulation |
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