CN108988948A - Coherent light, which is kept pouring in, passs relay system and trunking method - Google Patents
Coherent light, which is kept pouring in, passs relay system and trunking method Download PDFInfo
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- CN108988948A CN108988948A CN201810947275.4A CN201810947275A CN108988948A CN 108988948 A CN108988948 A CN 108988948A CN 201810947275 A CN201810947275 A CN 201810947275A CN 108988948 A CN108988948 A CN 108988948A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/615—Arrangements affecting the optical part of the receiver
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Abstract
A kind of coherent light, which is kept pouring in, passs relay system and trunking method, the system will carry out low noise amplification through the optical frequency reference signal of upper level optical fiber link long distance transmission by the relevant optical receiver apparatus of the first order, and amplified optical signal is returned to upper level optical fiber link；Amplified optical signal is exported to next stage optical fiber link, by the return optical signal of input by the relevant light-receiving and noise compensation apparatus of the second level and carries out low noise amplification, and the phase noise introduced when transmitting in next stage optical fiber link to optical frequency standarad signal compensates, so that the optical frequency reference signal PGC demodulation that remote ground terminal receives is in the phase of transmitting terminal optical frequency reference signal.Technical solution of the present invention the very good solution limitation of extra long distance optical frequency reference signal transmission looped phase locking bandwidth and the attenuation problem of signal, single span amplification distance and transmitting accuracy when substantially increasing optical frequency reference signal transmission.
Description
Technical field
The relay system and trunking method transmitted the present invention relates to optical signal in a kind of optical fiber link.Particularly, it is related to one
The relevant opctical frequency standard calibration signal transmitting relay system of kind and trunking method.
Background technique
High-precision frequency standard Transfer Technology has critically important in the delicate metering of time-frequency tolerance and fundamental physical quantity
Meaning.The long-range comparing of light clock needs the transmitting accuracy of optical frequency transmission system to can achieve 10 under kilosecond time scale-18Amount
Grade, this has exceeded the performance for using satellite link to carry out frequency comparison as transmitting medium from far away.Therefore, based on the height of optical fiber
Resolution optical Frequency Transfer technology is come into being.
Currently, the Frequency Transfer technology based on optical fiber has made the optical frequency standard of thousand kilometers transmit and compare
Be possibly realized, but technique still has following problems in the transmitting of long range: 1. programs needs will be transmitted to remote
The optical signal at end returns to local side to obtain the phase noise that optical frequency standarad signal introduces in optical fiber link transmitting, with distance
Growth, the feedback bandwidth of system can reduce therewith, and the corresponding feedback bandwidth of optical fiber link of usual thousand kilometers can reduce
To tens Hz, this substantially reduces the transmitting accuracy of optical frequency standarad signal；2. needing to place multiple two-way er-dopeds in a link
Fiber amplifier (EDFA) or optical fiber Brillouin amplifier (FBA) compensate the optical power of loss.Two-way EDFA has
Very wide light amplification bandwidth, end face reflection, Rayleigh scattering light in link can generate unnecessary light to EDFA and feed back, triggering
EDFA's is excited effect, so that the gain of two-way EDFA would generally be restricted to 18-20dB, multiple two-way EDFA grades of joint conferences are significant
The signal-to-noise ratio of transmitting optical frequency standarad signal is reduced to deteriorate the stability of optical frequency transmitting；The advantages of FBA is that light amplification bandwidth is small
(usually less than 30MHz), so as to avoid rayleigh backscattering signal amplification to amplifier gain and transmitting stability shadow
It rings, however, the effect in order to guarantee amplification, the optical frequency needs of usual Brillouin's pumping laser are locked in the light for being amplified optical signal
On frequency, the complexity of system is increased, special messenger is needed to safeguard.
In order to solve the problems, such as above-mentioned two o'clock, " Chiodo N, Quintin N, Stefani F, et al.Cascaded
optical fiber link using the internet network for remote clocks comparison
[J] .Optics Express, 2015,23 (26): 33927-33937. ", which is proposed, transmits long range optical frequency standarad signal,
It is segmented the method for carrying out phase noise compensation using multiple relay stations, can preferably solve optical fiber when long range optical signal transmission
Linkage length is to the limitation of Transmission system feedback bandwidth and the attenuation problem of signal.However, this relaying station structure still remains
Two point defects: 1. this relaying station structures only considered the amplification to the input optical signal of previous stage, and there is no to next stage light
The optical signal that fine link passes over amplifies, therefore single span amplification distance is still limited, in the 1100km light that France carries out
In clock control experiment, 3 two-way EDFA of placement is also needed to carry out auxiliary amplification, such gesture between two relay stations of 280km
There must be a degree of deterioration to the signal-to-noise ratio of optical signal；2. using light when amplifying to previous stage input optical signal and locking
A high-performance narrow linewidth laser output phase in system is locked in input opctical frequency standard calibration signal by the scheme of phase ring,
The price of this narrow linewidth laser is usually very high, considerably increases the cost of this relay station.
Summary of the invention
The present invention proposes a kind of coherent light and keeps pouring in and pass relay system precisely in order to solve problems of the prior art
And trunking method.
A purpose according to the present invention provides a kind of coherent light and keeps pouring in and passs relay system, which includes: phase stem grafting
Receiving apparatus carries out the optical signal received for receiving the optical frequency reference signal through upper level optical fiber link long distance transmission
Low noise amplification, and a part of amplified optical signal is returned into upper level optical fiber link；Relevant light-receiving and noise compensation
Device is put for exporting amplified optical signal to next stage optical fiber link, by the return optical signal progress low noise of input
Greatly, the phase noise introduced when and transmitting in next stage optical fiber link to optical frequency standarad signal compensates.
Another purpose according to the present invention provides a kind of coherent light and keeps pouring in and pass trunking method, this method comprises: passing through
Coherent receiver receives the optical frequency standarad signal that upper level optical fiber link passes over and carries out to this optical frequency standarad signal low
Noise amplification；Amplified optical frequency standarad signal is divided into two-way, returns to upper level optical fiber link all the way, another output is to phase
Dry light-receiving and noise compensation apparatus；Relevant light-receiving and noise compensation apparatus receive the opctical frequency standard that next stage link passes over
Calibration signal simultaneously carries out low noise amplification to this optical frequency standarad signal；Opctical frequency standard is compensated by relevant light-receiving and noise compensation apparatus
The phase noise that calibration signal is introduced when next stage optical fiber link transmits.
Preferably, the optical frequency standarad signal that passes over of upper level optical fiber link received by coherent receiver and to this
Optical frequency standarad signal carries out the optical signal that low noise amplification is achieved in that upper level optical fiber link passes over and injects from sharp
To complete to lock from the injection of laser in light device；Phase-modulation, heterodyne detection technology combination PHASE-LOCKED LOOP PLL TECHNIQUE based on AOM are raw
At the feedback compensation signal of the phase noise introduced in injection locking process, and the feedback compensation signal is loaded into locking phase and is executed
To eliminate the phase noise that injection locking process introduces on device AOM, to realize the height of upper level link optical frequency standarad signal
Sensitivity reception and low noise amplification.
Preferably, the optical frequency standarad signal that relevant light-receiving and noise compensation apparatus reception next stage link pass over is simultaneously
The optical signal that low noise amplification is achieved in that next stage optical fiber link passes over is carried out to this optical frequency standarad signal to inject
To complete to lock from the injection of laser from laser；It is generated and is injected by coherent homodyne Detection Techniques combination PHASE-LOCKED LOOP PLL TECHNIQUE
The feedback compensation signal of the phase noise introduced in locking process, and the feedback compensation signal is loaded into the driving from laser
To eliminate the phase noise that injection locking process introduces on electric current, to realize the highly sensitive of next stage link optical frequency standarad signal
Degree receives and low noise amplification.
Preferably, optical frequency standarad signal is compensated by relevant light-receiving and noise compensation apparatus to pass in next stage optical fiber link
The phase noise introduced when defeated is achieved in that the optical frequency standarad signal for receiving upper level optical fiber link carries out low noise
The optical frequency standarad signal passed over after amplification with amplified next stage optical fiber link is compared to obtain optical frequency standarad signal
The phase noise introduced when being transmitted in next stage optical fiber link；It is generated based on PHASE-LOCKED LOOP PLL TECHNIQUE for compensating the phase noise
Feedback compensation signal is relayed, and the relaying feedback compensation signal is acted in second sound-optic modulator to relay system output
Optical frequency standarad signal carries out frequency modulation(PFM) to compensate the phase that optical frequency standarad signal is introduced in the transmission of next stage optical fiber link and make an uproar
Sound.
Particularly, the optical frequency standarad signal of long range is transmitted, the present invention provides one kind can be simultaneously to front stage
The optical signal that optical fiber link passes over carries out high sensitivity detection, and the method for low noise amplification is being added without the two-way of auxiliary
On the basis of amplifier, the single span amplification distance of relay station is substantially increased, and low in cost, be easy to integreted phontonics.
Compared with prior art, the beneficial effects of the present invention are:
1) optical signal amplification of high sensitivity signal detection and low noise, high-gain may be implemented in the present invention.Based on laser
The injection locking principle of device, the power of input optical signal is minimum to can reach -55dBm, high sensitivity, from the output light function of laser
Rate is 10dBm-15dBm, therefore maximum gain amplifier range is 65dB-70dB, the 18dB-20dB gain of significantly larger than EDFA.
After injection locking technique combination PHASE-LOCKED LOOP PLL TECHNIQUE is constituted light injection phase-locking ring, the phase noise of injection locking amplification process introducing
It is suppressed significantly, is better than tradition mono- to two magnitudes of EDFA, and additional frequency fluctuation is less than 1mHz.
2) present invention devises front and back stages amplification system, is not required to after relay system of the invention is placed in optical fiber link
Additional image intensifer is added, the single span amplification distance and transmitting accuracy of the transmission of optical frequency standarad signal are substantially increased.It is right
It being calculated in the decaying of typical optical fiber 0.2dB/km, single span distance when being amplified using two-way EDFA is usually less than 100km, and
Then single span distance can be expanded into 300km-350km using relay system of the invention, specific distance setting can be according to biography
The feedback bandwidth of defeated system is comprehensive to be determined.
3) of the invention from laser is commercial semiconductor lasers, and at low cost, the operation is stable can meet industrial applications
Demand.
4) all opticators that the present invention designs are easy to integreted phontonics, i.e., entire relay system can integrate in one block of light
On electronic integrated circuit, facilitate the engineering application of next step.
Detailed description of the invention
Fig. 1 is that coherent light of the present invention keeps pouring in and passs relay system structural schematic diagram；
Fig. 2 is that coherent light of the present invention keeps pouring in the flow chart for passing trunking method；
Specific embodiment
Below with reference to embodiment and attached drawing, the invention will be further described, but protection model of the invention should not be limited with this
It encloses.
Referring to Fig. 1, Fig. 1 is that coherent light of the present invention keeps pouring in the structural schematic diagram for passing relay system, as seen from the figure, Yi Zhongxiang
Dry optical frequency transmits relay system, comprising: coherent receiver 1, for receiving the light through upper level optical fiber link long distance transmission
The optical signal received is carried out low noise amplification, and a part of amplified optical signal is returned to upper one by frequency reference signal
Grade optical fiber link；Relevant light-receiving and noise compensation apparatus 2, give next stage optical fiber chain for exporting amplified optical signal
The return optical signal of input is carried out low noise amplification by road, and when transmitting in next stage optical fiber link to optical frequency standarad signal
The phase noise of introducing compensates.
Coherent light of the present invention is introduced separately below keeps pouring in each component part for passing relay system.
<coherent receiver 1>
As shown in Figure 1, the coherent receiver 1 include: reference frequency oscillator RF, the first optical circulator CIR1,
One 1 × 2nd photo-coupler OC1, first sound-optic modulator AOM1, the second optical circulator CIR2, first are from laser Slave
Laser1,1 × 3 photo-coupler OC2, the 21 × 2nd photo-coupler OC3, the first photoelectric detector PD 1, radio frequency amplifier AMP and
First phase-locked loop circuit PLL1；
After the 2nd port of the first optical circulator CIR1 receives optical frequency reference signal, pass through first ring of light shape
The 3rd port of device CIR1 is exported to the one 1 × 2nd photo-coupler OC1, and the one 1 × 2nd photo-coupler OC1 will input optical frequency reference
Signal is divided into two-way, and the first via inputs the 21 × 2nd photo-coupler OC3, and another way is input to first sound-optic modulator AOM1, should
The 1st port of the second optical circulator CIR2 of delivery outlet connection of first sound-optic modulator AOM1, the 2nd of the second optical circulator CIR2 the
The output light injection first of port is first amplified from laser Slave Laser1 through this from laser Slave Laser1
2nd port, 3rd port of the output light successively through the second optical circulator CIR2 input 1 × 3 photo-coupler OC2,1 × 3 optical coupling
Input optical signal is divided into three tunnels by device OC2, the 21 × 2nd photo-coupler OC3 is inputted all the way, with the one 1 × 2nd photo-coupler OC1's
Beam is closed in first via output, and the output optical signal of the 21 × 2nd photo-coupler OC3, which is incident on the generation of the first photoelectric detector PD 1, penetrates
Amplify the first phase-locked loop circuit PLL1 of input through radio frequency amplifier AMP after frequency signal, with the reference frequency oscillator RF ratio
To generate error signal after through pid algorithm handle export control signal to first sound-optic modulator AOM1 rf input port, it is right
Optical signal through first sound-optic modulator AOM1 carries out frequency modulation(PFM), real to eliminate the phase noise that injection locking process introduces
Existing low noise amplification；Second tunnel inputs relevant light-receiving and noise compensation apparatus 2；Third road inputs the first optical circulator CIR1's
1st port, the 2nd port output through first optical circulator CIR1, back in upper level optical fiber link.
In one embodiment of the invention, above-mentioned one 1 × 2nd photo-coupler OC1 and the 21 × 2nd photo-coupler OC3
Coupling ratio is 50/50；The center shift frequency of first sound-optic modulator AOM1 is+80MHz, modulation bandwidth 8MHz；First from laser
The line width of device Slave Laser1 is less than 2MHz, output power 10dBm-15dBm, and input power range is -55dBm-0dBm,
Therefore this first from laser Slave Laser1 amplification optical signal maximum gain range be 65dB-70dB.Above-mentioned optics
Device, including the first optical circulator CIR1, the one 1 × 2nd photo-coupler OC1, first sound-optic modulator AOM1, the second optical circulator
CIR2,1 × 3 photo-coupler OC2, the optical fiber connected between the 21 × 2nd photo-coupler OC3 are all accomplished most short as far as possible, and unite
One is placed in the stringent temperature control of progress in special temperature control module.
The output of above-mentioned local reference frequency oscillator RF at least two tunnel radiofrequency signals.In one embodiment of the present of invention
Middle output is 80MHz to the frequency of the first phase-locked loop circuit PLL1 and third phase-locked loop circuit PLL3.First photodetector
The frequency response range of PD1 is 30kHz-1.5GHz, and the input frequency range of radio frequency amplifier AMP is 2MHz-3GHz.
<relevant light-receiving and noise compensation apparatus 2>
As shown in Figure 1, the relevant light-receiving and noise compensation apparatus include: third optical circulator CIR3, the 4th light
Circulator CIR4, the 31 × 2nd photo-coupler OC4, the 41 × 2nd photo-coupler OC5, the 51 × 2nd photo-coupler OC6, the 6th 1
× 2 photo-coupler OC7, the 71 × 2nd photo-coupler OC8, second sound-optic modulator AOM2, the second photoelectric detector PD 2, third
Photoelectric detector PD 3, second is from laser Slave Laser2, the second phase-locked loop circuit PLL2 and third phase-locked loop circuit
PLL3；
The optical port of the second sound-optic modulator AOM2 receives the opctical frequency standard definite message or answer that next stage optical fiber link returns
Number, it exports through second sound-optic modulator AOM2 to the 2nd port of third optical circulator CIR3, passes through the third optical circulator
The 3rd port of CIR3 is exported to the 31 × 2nd photo-coupler OC4, and optical signal is divided into two-way by the 31 × 2nd photo-coupler OC4,
It is exported all the way to the 51 × 2nd photo-coupler OC6, the second tunnel inputs the 1st port of the 4th optical circulator CIR4, the 4th ring of light shape
The output light injection second of the 2nd port of device CIR4 is from laser Slave Laser2, through this second from laser Slave
2nd port, 3rd port of the amplified output light of Laser2 through the 4th optical circulator CIR4 input the 41 × 2nd photo-coupler
Input optical signal is divided into two-way by OC5, the 41 × 2nd photo-coupler OC5, all the way with the first of the 31 × 2nd photo-coupler OC4
Road optical signal closes beam at the 51 × 2nd photo-coupler OC6, and the output optical signal of the 51 × 2nd photo-coupler OC6 is incident on
Two photoelectric detector PDs 2 input the second phase-locked loop circuit PLL2 after obtaining the phase noise that injection locking process introduces, and calculate through PID
Method processing export control signal to second from the driving current of laser Slave Laser2 modulation mouth, to second from laser
The output optical signal of Slave Laser2 carries out frequency modulation(PFM), to eliminate the phase noise that injection locking process introduces；
In one embodiment of the invention, above-mentioned 31 × 2nd photo-coupler OC4 and the 51 × 2nd photo-coupler OC6
The coupling ratio that coupling ratio is the 50/50, the 41 × 2nd photo-coupler OC5 is 30/70, wherein 30% part inputs the 71 × 2nd optocoupler
Clutch OC8,70% part input the 51 × 2nd photo-coupler OC6；The center shift frequency of second sound-optic modulator AOM2 is -80MHz,
Modulation bandwidth is 8MHz, and the center shift frequency direction of second sound-optic modulator AOM2 and the center of first sound-optic modulator AOM1 are moved
Frequently contrary, it ensure that the consistency of the optical signal frequency of this relay system of input and output, and positive and negative shift frequency can eliminate
The phase noise that local reference frequency oscillator RF is introduced；Second is less than 2MHz from the line width of laser Slave Laser2, defeated
Power is 10dBm-15dBm out, and input power range is -55dBm-0dBm, therefore this is second from laser Slave Laser2
The maximum gain range for amplifying optical signal is 65dB-70dB；The frequency response range of second photoelectric detector PD 2 is 0-
150MHz。
61 × 2nd photo-coupler OC7 receives the optical signal that coherent receiver 1 inputs, and is classified as two
Road, the second road optical signal with the 41 × 2nd photo-coupler OC5 output closes beam at the 71 × 2nd photo-coupler OC8 all the way, should
The output optical signal of 71 × 2nd photo-coupler OC8 is incident on after third photoelectric detector PD 3 generates radiofrequency signal and inputs third
Phase-locked loop circuit PLL3, compared with the local reference frequency oscillator RF handle after generating error signal through pid algorithm it is defeated
Control signal carries out the optical signal through second sound-optic modulator AOM2 to the rf input port of second sound-optic modulator AOM2 out
Frequency modulation(PFM), to eliminate the phase noise that optical frequency standarad signal is introduced in the transmission of next stage optical fiber link；61 × 2nd light
The 1st port of the second road optical signal input third optical circulator CIR3 of coupler OC7 output, third optical circulator CIR3's
The optical signal of 2nd port output is exported through second sound-optic modulator AOM2 gives next stage optical fiber link.
In one embodiment of the invention, the coupling ratio of above-mentioned 61 × 2nd photo-coupler OC7 is 20/80, wherein
The 71 × 2nd photo-coupler OC8 of 20% part input, the 1st port of 80% part input third optical circulator CIR3, the 7th 1 ×
The coupling ratio of 2 photo-coupler OC8 is 50/50；The frequency response range of third photoelectric detector PD 3 is 30kHz-1.5GHz.
Above-mentioned optical device, including third optical circulator CIR3, the 4th optical circulator CIR4, the 31 × 2nd photo-coupler
OC4, the 41 × 2nd photo-coupler OC5, the 51 × 2nd photo-coupler OC6, the 61 × 2nd photo-coupler OC7, the 71 × 2nd optocoupler
The optical fiber connected between clutch OC8, second sound-optic modulator AOM2 all accomplishes temperature that is most short, and being uniformly placed in special as far as possible
It controls and carries out stringent temperature control in module.
<coherent light, which is kept pouring in, passs trunking method>
Coherent light of the invention is received below keep pouring in pass trunking method.
Fig. 2 shows that coherent light of the invention keeps pouring in the flow chart for passing trunking method.
As shown in Fig. 2, coherent light of the invention keeps pouring in and passs trunking method and include the following steps: to connect by coherent receiver
It receives the optical frequency standarad signal that upper level optical fiber link passes over and low noise amplification is carried out to this optical frequency standarad signal；It will amplification
Optical frequency standarad signal afterwards is divided into two-way, returns to upper level optical fiber link all the way, and another output gives relevant light-receiving and noise
Compensation device；Relevant light-receiving and noise compensation apparatus receive the optical frequency standarad signal that next stage link passes over and to this light
Frequency marking calibration signal carries out low noise amplification；Optical frequency standarad signal is compensated in next stage by relevant light-receiving and noise compensation apparatus
The phase noise that optical fiber link introduces when transmitting.
Wherein, described that the optical frequency standarad signal that passes over of upper level optical fiber link is received simultaneously by coherent receiver
To this optical frequency standarad signal carry out low noise amplification the step of include: upper level optical fiber link pass over optical signal injection from
To complete to lock from the injection of laser in laser；Phase-modulation, heterodyne detection combination PHASE-LOCKED LOOP PLL TECHNIQUE based on AOM generate
The feedback compensation signal of the phase noise introduced in injection locking process, and the feedback compensation signal is loaded into locking phase actuator
To eliminate the phase noise that injection locking process introduces on part AOM, to realize the Gao Ling of upper level link optical frequency standarad signal
Sensitivity receives and low noise amplification.
Wherein, the relevant light-receiving and noise compensation apparatus receive the opctical frequency standard definite message or answer that next stage link passes over
Number and the step of low noise amplification is carried out to this optical frequency standarad signal include: that the optical signal that passes over of next stage optical fiber link is infused
Enter from laser to complete to lock from the injection of laser；PHASE-LOCKED LOOP PLL TECHNIQUE is combined to generate injection lock by coherent homodyne detection
The feedback compensation signal of the phase noise introduced during fixed, and the feedback compensation signal is loaded into the driving electricity from laser
To eliminate the phase noise that injection locking process introduces on stream, to realize the high sensitivity of next stage link optical frequency standarad signal
Reception and low noise amplification.
Wherein, described that optical frequency standarad signal is compensated in next stage optical fiber chain by relevant light-receiving and noise compensation apparatus
The step of phase noise that road introduces when transmitting includes: that the optical frequency standarad signal for receiving upper level optical fiber link carries out low noise
The optical frequency standarad signal passed over after sound amplification with the next stage optical fiber link received is compared to obtain opctical frequency standard definite message or answer
The phase noise introduced when transmitting number in next stage optical fiber link；It is generated based on PHASE-LOCKED LOOP PLL TECHNIQUE for compensating the phase noise
Relaying feedback compensation signal, and by the relaying feedback compensation signal act in second sound-optic modulator to relay system export
Optical frequency standarad signal carry out frequency modulation(PFM).
Claims (8)
1. a kind of coherent light, which is kept pouring in, passs relay system, which is characterized in that the system includes:
Coherent receiver (1) will be received for receiving the optical frequency standarad signal through upper level optical fiber link long distance transmission
Optical signal carry out low noise amplification, and a part of amplified optical signal is returned into upper level optical fiber link, another part
Amplified optical signal transmission is to relevant light-receiving and noise compensation apparatus (2)；
Relevant light-receiving and noise compensation apparatus (2), the amplified optical signal for inputting coherent receiver (1) export
Low noise amplification is carried out to next stage optical fiber link, the optical frequency standarad signal for returning to next stage optical fiber link, and to opctical frequency standard
The phase noise that calibration signal introduces when transmitting in next stage optical fiber link compensates.
2. coherent light according to claim 1, which is kept pouring in, passs relay system, which is characterized in that the coherent receiver
(1) include:
Reference frequency oscillator (RF), the first optical circulator (CIR1), the one 1 × 2nd photo-coupler (OC1), the first acousto-optic modulation
Device (AOM1), the second optical circulator (CIR2), first are from laser (SlaveLaser1), 1 × 3 photo-coupler (OC2), the 2nd 1
× 2 photo-couplers (OC3), the first photodetector (PD1), radio frequency amplifier (AMP) and the first phase-locked loop circuit (PLL1)；
2nd port of first optical circulator (CIR1) receives the optical frequency standarad passed over from upper level optical fiber link
After signal, exported by the 3rd port of first optical circulator (CIR1) to the one 1 × 2nd photo-coupler (OC1), the one 1 ×
2 photo-couplers (OC1) will input opctical frequency standard calibration signal and be divided into two-way, and the first via inputs the 21 × 2nd photo-coupler (OC3), and second
Road is input to first sound-optic modulator (AOM1), and the delivery outlet of the first sound-optic modulator (AOM1) connects the second optical circulator
(CIR2) the 1st port, the output light of the 2nd port of the second optical circulator (CIR2) inject first from laser (Slave
Laser1), through this first from laser (Slave Laser1) amplified output light successively through the second optical circulator (CIR2)
The 2nd port, the 3rd port input 1 × 3 photo-coupler (OC2), which is divided into three for input optical signal
Road inputs the 21 × 2nd photo-coupler (OC3) all the way, closes beam with the output of the first via of the one 1 × 2nd photo-coupler (OC1), this
The output optical signal of 21 × 2 photo-couplers (OC3) is incident on after the first photodetector (PD1) generation radiofrequency signal through radio frequency
Amplifier (AMP) amplification input the first phase-locked loop circuit (PLL1) is exported with the local reference frequency oscillator (RF)
Reference signal compares to handle after obtaining the phase noise that injection locking process introduces through pid algorithm, exports control signal to first
The rf input port of acousto-optic modulator (AOM1) carries out frequency modulation(PFM) to the optical signal through first sound-optic modulator (AOM1)；The
Two tunnels input the relevant light-receiving in the second level and noise compensation apparatus (2)；Third road inputs the 1st end of the first optical circulator (CIR1)
Mouthful, the 2nd port output through first optical circulator (CIR1), back in upper level optical fiber link.
3. coherent light according to claim 1, which is kept pouring in, passs relay system, which is characterized in that the relevant light-receiving and make an uproar
Sound compensation device (2) includes:
Third optical circulator (CIR3), the 4th optical circulator (CIR4), the 31 × 2nd photo-coupler (OC4), the 41 × 2nd optocoupler
Clutch (OC5), the 51 × 2nd photo-coupler (OC6), the 61 × 2nd photo-coupler (OC7), the 71 × 2nd photo-coupler (OC8),
Second sound-optic modulator (AOM2), the second photodetector (PD2), third photodetector (PD3), second are from laser
(Slave Laser2), the second phase-locked loop circuit (PLL2) and third phase-locked loop circuit (PLL3)；
The optical port of the second sound-optic modulator (AOM2) receives the optical frequency standarad signal that next stage optical fiber link returns,
It exports through the second sound-optic modulator (AOM2) to the 2nd port of third optical circulator (CIR3), passes through the third optical circulator
(CIR3) the 3rd port is exported to the 31 × 2nd photo-coupler (OC4), and the 31 × 2nd photo-coupler (OC4) divides optical signal
For two-way, the 51 × 2nd photo-coupler (OC6) is inputted all the way, and the second tunnel inputs the 1st port of the 4th optical circulator (CIR4), warp
2nd port output, and inject second from laser (Slave Laser2) second is put through this from laser (Slave Laser2)
Output light after big is inputted through the 2nd port of the 4th optical circulator (CIR4), is exported through the 3rd port to the 41 × 2nd photo-coupler
(OC5), optical signal is divided into two-way by the 41 × 2nd photo-coupler (OC5), inputs the 71 × 2nd photo-coupler (OC8) all the way,
The first via optical signal of second tunnel and the 31 × 2nd photo-coupler (OC4) closes beam at the 51 × 2nd photo-coupler (OC6), this
The output optical signal of 51 × 2 photo-couplers (OC6) is incident on the second photodetector (PD2) and obtains injection locking process introducing
Phase noise after input the second phase-locked loop circuit (PLL2) and handled through pid algorithm and export control signal to second from laser
The driving current of (Slave Laser2) modulates mouth, carries out frequency from the output optical signal of laser (Slave Laser2) to second
Rate modulation；
61 × 2nd photo-coupler (OC7) receives the optical signal of coherent receiver (1) input, and is classified as two
Road, the first via optical signal with the output of the 41 × 2nd photo-coupler (OC5) closes at the 71 × 2nd photo-coupler (OC8) all the way
Beam, after the output optical signal of the 71 × 2nd photo-coupler (OC8) is incident on third photodetector (PD3) generation radiofrequency signal
It inputs third phase-locked loop circuit (PLL3), obtains optical frequency standarad signal next with reference frequency oscillator (RF) comparison
It is handled after the phase noise introduced when grade optical fiber link transmission through pid algorithm and exports control signal to second sound-optic modulator
(AOM2) rf input port carries out frequency modulation(PFM) to the optical signal through second sound-optic modulator (AOM2)；61 × 2nd light
1st port of the second road optical signal input third optical circulator (CIR3) of coupler (OC7) output, the third optical circulator
(CIR3) optical signal of the 2nd port output gives next stage optical fiber link through second sound-optic modulator (AOM2) output.
4. coherent light according to claim 1, which is kept pouring in, passs relay system, which is characterized in that the first sound-optic modulator
(AOM1) identical with the center shift frequency frequency of second sound-optic modulator (AOM2), shift frequency it is contrary.
5. being kept pouring according to coherent light described in claim 2 and 3 and passing relay system, which is characterized in that the one 1 × 2nd light
Coupler (OC1), 1 × 3 photo-coupler (OC2), the 21 × 2nd photo-coupler (OC3), the 31 × 2nd photo-coupler (OC4),
41 × 2 photo-couplers (OC5), the 51 × 2nd photo-coupler (OC6), the 61 × 2nd photo-coupler (OC7), the 71 × 2nd optocoupler
Clutch (OC8), the first optical circulator (CIR1), the second optical circulator (CIR2), third optical circulator (CIR3), the 4th ring of light shape
Device (CIR4), first sound-optic modulator (AOM1) and second sound-optic modulator (AOM2) are placed in active temperature control module
Stringent temperature control is carried out to reduce the frequency stability deterioration that not common fiber path temperature change introduces.
6. a kind of coherent light, which is kept pouring in, passs trunking method, which is characterized in that this method comprises the following steps: passing through coherent receiver
It receives the optical frequency standarad signal that upper level optical fiber link passes over and low noise amplification is carried out to this optical frequency standarad signal；
Amplified optical frequency standarad signal is divided into two-way, returns to upper level optical fiber link all the way, another output is to coherent light
Reception and noise compensation apparatus；
Relevant light-receiving and noise compensation apparatus receive the optical frequency standarad signal that next stage link passes over and to this opctical frequency standards
Calibration signal carries out low noise amplification；
Compensate what optical frequency standarad signal was introduced when next stage optical fiber link transmits by relevant light-receiving and noise compensation apparatus
Phase noise.
7. coherent light according to claim 6, which is kept pouring in, passs trunking method, which is characterized in that described to be filled by coherent reception
It sets the optical frequency standarad signal that reception upper level optical fiber link passes over and low noise amplification, tool is carried out to this optical frequency standarad signal
Steps are as follows for body:
The injection of optical frequency standarad signal is made to the state that injection locking is in from laser from laser；
It is generated by phase-modulation based on AOM, heterodyne detection technology combination PHASE-LOCKED LOOP PLL TECHNIQUE and to be introduced in injection locking process
The feedback compensation signal of phase noise, and the feedback compensation signal is loaded on locking phase performer AOM.
8. coherent light according to claim 6, which is kept pouring in, passs trunking method, which is characterized in that the relevant light-receiving and make an uproar
Sound compensation device receives the optical frequency standarad signal that next stage link passes over and carries out low noise to this optical frequency standarad signal and puts
Big step includes:
The injection of optical frequency standarad signal is made to the state that injection locking is in from laser from laser；
The feedback of the phase noise introduced in injection locking process is generated by coherent homodyne Detection Techniques combination PHASE-LOCKED LOOP PLL TECHNIQUE
Thermal compensation signal, and the feedback compensation signal is loaded into from the driving current of laser.
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