CN105933065A - Optical carrier suppression-based optical fiber distribution system and method of photo-produced microwave signals - Google Patents
Optical carrier suppression-based optical fiber distribution system and method of photo-produced microwave signals Download PDFInfo
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- CN105933065A CN105933065A CN201610218052.5A CN201610218052A CN105933065A CN 105933065 A CN105933065 A CN 105933065A CN 201610218052 A CN201610218052 A CN 201610218052A CN 105933065 A CN105933065 A CN 105933065A
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2543—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to fibre non-linearities, e.g. Kerr effect
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2569—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to polarisation mode dispersion [PMD]
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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
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6163—Compensation of non-linear effects in the fiber optic link, e.g. self-phase modulation [SPM], cross-phase modulation [XPM], four wave mixing [FWM]
-
- 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
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
Abstract
The present invention provides an optical carrier suppression-based optical fiber distribution system and method of photo-produced microwave signals. The optical carrier suppression-based optical fiber distribution system of the photo-produced microwave signals includes a photo-produced microwave signal module, a phase detection module, a phase compensation module and a system output module; the photo-produced microwave signal module generates signal light which is required to be transmitted to a remote end and local light which serves as reference; the phase detection module detects phase jitter caused by optical fiber link jitter and obtains corresponding phase information; the phase compensation module controls the output of a voltage-controlled oscillator according to the phase information, and performs single-sideband modulation on the microwave signals outputted by a microwave signal generator through the output signals of the voltage-controlled oscillator, and then generates compensation signals; and the system output module outputs signals light which has been subjected to phase compensation. With the system and method of the invention adopted, phase detection sensitivity is increased to a magnitude order of light wavelength; technical difficulty in live operation-based high-frequency microwave mixing can be eliminated; a phase-locked loop is adopted to carry out feedback control on obtained phase error signals; and a phase compensation mechanism is fast and accurate, and is not limited in compensation scope.
Description
Technical field
The present invention relates to photoproduction microwave signal distribution technology field, in particular it relates to a kind of light based on optical carrier suppression
The optical fiber dissemination system of raw microwave signal and method.
Background technology
The distribution technique of local oscillator reference signal is a kind of to be transferred to by optical fiber link by the local reference signal of high stable
The each user of far-end, each user of far-end recover reference signal need and local reference signal highly coherent, its core technology be as
What is the need except shaking, because of optical fiber link, the additional noise caused.
The phase error compensation that optical fiber link shake causes is broadly divided into light penalty method and electronic compensating method.Light penalty method is main
By means of optical delay line, although it can not be limited by transmission frequency, but its compensation range is limited in time delay module
The length of optical fiber, and response speed is slow.The method of electronic compensating mainly includes electricity delay line and the method for mixing, Qi Zhong electricity
Time delay collimation method is similarly limited to compensation range, although mixing method can exempt the design of circuit, however it is necessary that increase microwave source and
The quantity of laser instrument produces auxiliary signal.
Also it is a kind of relatively common method by phase error being compensated by voltage controlled oscillator, but carries out height
When keeping pouring in defeated, the agitator of high tuning coefficient can increase the circuit noise introduced because of phaselocked loop, the most how to realize high-frequency microwave
Can reduce again the additional noise brought because of feedback circuit becomes the most important simultaneously in the optical fiber link distribution of signal.
Summary of the invention
For defect of the prior art, it is an object of the invention to provide a kind of photoproduction microwave based on optical carrier suppression letter
Number optical fiber dissemination system and method.
The optical fiber dissemination system of the photoproduction microwave signal based on optical carrier suppression according to present invention offer, including: photoproduction
Microwave signal module, phase detecting module, phase compensation block and system output module, wherein:
-described photoproduction microwave signal module, for generating the flashlight needing to be transferred to far-end and this locality being used as reference
Light；
-described phase detecting module, shakes, because of optical fiber link, the phase jitter caused for detection, it is thus achieved that corresponding phase place
Information；
-described phase compensation block, carries out phase-locked for the phase information detected according to phase detecting module, then controls
The output of voltage controlled oscillator processed, the microwave signal exported microwave signal generator by the output signal of voltage controlled oscillator is carried out
Generating after single sideband modulation and compensate signal, described compensation signal is for compensating the phase of light wave of flashlight；
-described system output module, for exporting the flashlight through phase compensation.
Preferably, described photoproduction microwave signal module includes: optical fiber laser, the first photo-coupler, first Mach of Zeng De
Manipulator, the first power splitter, second Mach of zehnder modulators, microwave signal generator, rubidium clock source and single side-band modulator, institute
State the optical signal that optical fiber laser sends and be divided into two ways of optical signals after the first photo-coupler；Wherein a road optical signal is through
One Mach of zehnder modulators, another road optical signal is through second Mach of zehnder modulators, one end of described microwave signal generator
It is connected with rubidium clock source and the microwave signal of generation is delivered to the first power splitter by the other end of described microwave signal generator, its
In by the first power splitter, the microwave signal of 10% ratio is delivered to first Mach of zehnder modulators, by the microwave of 90% ratio
Signal is delivered to second Mach of zehnder modulators after the RF mouth of single side-band modulator.
Preferably, phase detecting module and phase compensation block collectively form compensation phase generating module, described compensation phase
Position generation module includes: the second photo-coupler, balance photodetector, digital frequency phase detector, loop filter, VCO
Device, the second power splitter, the first band filter, the second band filter, the 3rd band filter, the 4th band filter,
Five band filters, the first frequency mixer, the second frequency mixer, three-mixer；The reference signal that rubidium clock source generates sequentially passes through number
Arriving voltage controlled oscillator after word phase frequency detector, loop filter, the oscillator signal that described voltage controlled oscillator produces is divided into two-way,
One tunnel is transmitted to single side-band modulator；The transmission of another road is again split into two paths of signals to the second power splitter, a road signal transmission
To the first frequency mixer, another road signal transmits to the second frequency mixer；
The output signal of second Mach of zehnder modulators enters 100km optical fiber link through the first optical circulator and is transferred to far
End, at far-end, then part output signal again passes by 100km optical fiber link and arrives local side, sequentially passes through the first light annular
Device, polarization state tracker couple in the output signal of the second photo-coupler and first Mach of zehnder modulators, and will coupling
Signal be divided into two-way by balance photodetector, road first band filter transmits to the first frequency mixer, another road
Transmit to the second frequency mixer through the second band filter；The output signal of the first frequency mixer after the 3rd band-pass filter with
Mix at three-mixer through the output signal of the second frequency mixer of the 4th band-pass filter, the output of three-mixer
Signal enters digital frequency phase detector after the 5th band-pass filter, and the reference signal that rubidium clock source generates simultaneously enters numeral
Phase frequency detector, the signal of digital frequency phase detector output is used for controlling voltage controlled oscillator after loop filter and generates phase place
Compensate signal.
Preferably, described system output module includes: the second optical circulator, erbium-doped fiber amplifier, acousto-optic modulator, partially
Polarization state tracker, the 3rd photo-coupler and high-speed wideband photodetector, the flashlight through phase compensation is passed by optical fiber
Transport to far-end, and sequentially pass through the second optical circulator, erbium-doped fiber amplifier, acousto-optic modulator, the transmission of polarization state tracker extremely
Being divided into two paths of signals after 3rd photo-coupler, a road signal transmission exports to high speed wideband photodetectors, another road signal
Enter the second optical circulator and pass back to local side.
Preferably, described optical fiber laser is the optical fiber laser of narrow linewidth, and live width is 1KHz.
Preferably, described single side-band modulator includes: LO port, IF port and RF port, described single side-band modulator
LO port input 10GHz microwave signal, the IF port of single side-band modulator is connected with voltage controlled oscillator, described single sideband modulation
The RF port of second Mach of zehnder modulators of RF port of device is connected.
Preferably, described balance photodetector is for shaking, to because of optical fiber link, the phase place caused in optical wavelength magnitude
Shake carries out phase demodulation.
Preferably, after the frequency signal that the 5th band filter inputs is divided by described digital frequency phase detector again with
The rubidium clock signal in rubidium clock source carries out phase demodulation；Specifically, the frequency signal of the 5th band filter input 140MHz, through digital frequency discrimination
The signal of 10MHz is generated, by the rubidium clock signal of the 10MHz that the 10MHz signal after frequency dividing sends with rubidium clock source after phase discriminator frequency dividing
Carry out phase demodulation.
According to the optical fiber distribution method of the photoproduction microwave signal based on optical carrier suppression that the present invention provides, including walking as follows
Rapid:
Photoproduction microwave signal generation step: generate the flashlight needing to be transferred to far-end and the local light being used as reference；
Phase detection step: detect because optical fiber link shakes the phase jitter caused, it is thus achieved that corresponding phase information；
Phase compensation step: the phase information for detecting according to phase detecting module controls the defeated of voltage controlled oscillator
Going out, the microwave signal exported microwave signal generator by the output signal of voltage controlled oscillator is generated after carrying out single sideband modulation
Compensating signal, described compensation signal is for compensating the phase of light wave of flashlight；
System output step: export the flashlight through phase compensation at far-end.
Compared with prior art, the present invention has a following beneficial effect:
1, the optical fiber dissemination system of the photoproduction microwave signal based on optical carrier suppression that the present invention provides is avoided using high frequency
Voltage controlled oscillator produces the high-frequency microwave signal needing transmission, then the high frequency using the Form generation of photoproduction microwave to need is micro-
Ripple signal, uses the form of twice heterodyne mixing to obtain phase error, discriminator sensitivity rises to optical wavelength magnitude, breaches
Use the technical difficulty carrying out high-frequency microwave mixing on electricity.
2, the optical fiber dissemination system of the photoproduction microwave signal based on optical carrier suppression that the present invention provides is by phaselocked loop pair
The phase error signal obtained carries out feedback control, and the most accurately and compensation range is unrestricted for this phase compensation mechanism.
Accompanying drawing explanation
By the detailed description non-limiting example made with reference to the following drawings of reading, the further feature of the present invention,
Purpose and advantage will become more apparent upon:
The structural representation of the optical fiber dissemination system of the photoproduction microwave signal based on optical carrier suppression that Fig. 1 provides for the present invention
Figure；
Fig. 2 is the system of present invention phase drift schematic diagram of signal in the case of uncompensated；
Fig. 3 is the system of present invention phase drift schematic diagram of signal in the case of phase compensation；
Fig. 4 is the spectrogram of the photoproduction microwave signal of the present invention.
In figure:
1-optical fiber laser；2-the first photo-coupler；First Mach of zehnder modulators of 3-；
4-the first power splitter；5-microwave signal generator；6-rubidium clock source；
Second Mach of zehnder modulators of 7-；8-single side-band modulator；9-voltage controlled oscillator；
10-loop filter；11-digital frequency phase detector；12-the first optical circulator；
13-polarization state tracker；14-the second photo-coupler；15-balances photodetector；
16-the first band filter；17-the second band filter；18-the second power splitter；
19-the first frequency mixer；20-the second frequency mixer；21-the 3rd band filter；
22-three-mixer；23-the 4th band filter；24-the 5th band filter；
25-the second optical circulator；26-erbium-doped fiber amplifier；27-acousto-optic modulator；
28-polarization state tracker；29-the 3rd photo-coupler；30-high-speed wideband photodetector.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following example will assist in the technology of this area
Personnel are further appreciated by the present invention, but limit the present invention the most in any form.It should be pointed out that, the ordinary skill to this area
For personnel, without departing from the inventive concept of the premise, it is also possible to make some changes and improvements.These broadly fall into the present invention
Protection domain.
According to the dissemination system block diagram of the photoproduction microwave signal based on optical carrier suppression shown in Fig. 1, this invention needs light
Fibre laser the 1, first photo-coupler 2, first Mach of zehnder modulators the 3, first power splitter 4, microwave signal generator of 10GHz
5,6, second Mach of the rubidium clock source of 10MHz zehnder modulators 7, single side-band modulator 8,35MHz voltage controlled oscillator 9, loop filtering
Device 10, digital frequency phase detector the 11, first optical circulator 12, polarization state tracker the 13, second photo-coupler 14, balance light electrical resistivity survey
Survey device 15, first band filter 16 of 5MHz, second band filter the 17, second power splitter 18, first frequency mixer of 75MHz
19, the second frequency mixer 20, the 3rd band filter 21 of 30MHz, three-mixer 22, the 4th band filter of 110MHz
23, the 5th band filter 24, second optical circulator 25 of 140MHz, erbium-doped fiber amplifier 26, acousto-optic modulator 27, polarization
State tracker the 28, the 3rd photo-coupler 29, high-speed wideband photodetector 30.
At local side, the rubidium clock source 6 of 10MHz is connected with the microwave signal generator 5 of 10GHz as reference signal, produces
Then the signal of 10GHz is divided into two-way by the first power splitter 4, and signal that 35MHz voltage controlled oscillator 9 produces and wherein a road are micro-
Ripple signal is connected with single side-band modulator 8 and microwave signal carries out single sideband modulation, and the optical fiber laser 1 of 1550nm wavelength produces
Optical signal be divided into two-way through 50:50 the first photo-coupler 2, modulated microwave signal pass through second Mach of zehnder modulators 7
One road optical signal is carried out optical carrier suppression modulation, is then passed through the first optical circulator 12 and enters 100km standard single-mode fiber biography
It is passed to far-end.Another road microwave signal carries out optical carrier suppression tune by first Mach of zehnder modulators 3 to another road optical signal
System.If the output of optical fiber laser is expressed as ELaser(t), computing formula is as follows:
In formula: ωcWithIt is respectively center angular frequency and the phase place of initial optical signal, at local side through first Mach once
The flashlight of moral manipulator 3 modulation is expressed as Ea(t), computing formula is as follows:
In formula: ωreWithIt is respectively center angular frequency and the start-phase of microwave signal,WithIt is respectively
The center angular frequency of 35MHz voltage controlled oscillator 9 and initial phase.Modulate through second Mach of zehnder modulators 7 at local side
Reference light is expressed as Eb(t), computing formula is as follows:
Flashlight is connected with the second optical circulator 25 of far-end after 100km standard single-mode fiber transmits, then er-doped
The power attenuation that flashlight is caused by fiber amplifier 26 because of optical fiber link compensates, subsequently into acousto-optic modulator 27 to letter
Number light carries out the lower skew of 40MHz frequency, then in order to alleviate the impact of polarization decay, to flashlight polarization state tracker 28
Carry out polarization state tracking, be divided into two ways of optical signals through the 3rd photo-coupler 29 the most again, defeated as system of a road flashlight
Going out, this flashlight is expressed as ERe(t), computing formula is as follows:
In formula: τ represents that the transmission delay that optical fiber is caused by the factor such as ambient temperature, pressure changes,WithRepresent
Center angular frequency and phase place for far-end acousto-optic modulator 27.This road optical signal can be raw by high-speed wideband photodetector 30
Becoming microwave signal to be supplied to user to use, this photoproduction microwave signal is represented by I1(t), computing formula is as follows:
Formula (5) shows that only flashlight to far-end carries out phase compensation and could obtain relevant microwave signal.Therefore adopt
Carry out phase compensation with round-trip delay correction method, assume that the time delay that flashlight brings through identical single-mode fiber for twice is trembled simultaneously
Dynamic identical
Another road flashlight is connected with the second optical circulator 25 of far-end and passes back to this locality through 100km single-mode fiber again
End, enters the first local optical circulator 12, and this flashlight is represented by ERt(t), computing formula is as follows:
This flashlight initially enters the polarization state tracker 13 of this locality, then with local reference light through the second photo-coupler 14
Carry out closing road, after being then passed through balancing photodetector 15, enter the second band of first band filter 16 and 75MHz of 5MHz
Bandpass filter 17 is filtered respectively obtaining two intermediate-freuqncy signals of 5MHz and 75MHz, and the second power splitter 18 shakes with the voltage-controlled of 35MHz
Swinging device 9 to be connected, then first band filter 16 of 5MHz and a delivery outlet of power splitter 18 are connected with frequency mixer 19 and carry out
Mixing, obtains 30MHz intermediate-freuqncy signal by the 3rd band filter 21 of 30MHz the most again, the second logical filter of band of same 75MHz
Another delivery outlet of ripple device 17 and power splitter 18 is connected with frequency mixer 20 and is mixed, the most again by the 4th band of 110MHz
Bandpass filter 23 obtains 110MHz intermediate-freuqncy signal.4th band filter of the 3rd band filter 21 and 110MHz of 30MHz
23 are connected with three-mixer 22 is mixed, the 140MHz signal then obtained by the 5th band filter 24 of 140MHz
It is expressed as EIF(t), computing formula is as follows:
Being found by contrast (5) and (7), the phase place of two signals is relevant, by the signal of 140MHz and 10MHz
Rubidium clock signal carries out frequency and phase discrimination by digital frequency phase detector 11, and the error signal of generation controls through ring wave filter 10
The phase place of 35MHz voltage controlled oscillator 9, after loop-locking is stable,
In formula:For the initial phase of rubidium clock signal, owing to rubidium clock signal has extremely low phase noise, it is assumed that it
Phase place is constant.So just obtain stable microwave signal I at far-end2(t), computing formula is as follows:
In order to the performance of the long-distance optical fiber technology of the photoproduction microwave signal of the present invention is tested, this locality is modulated
Reference light and far-end one road flashlight obtain two light beat signals, two photo-beats through overbalance photodetector after coupling
Frequently signal obtains an intermediate-freuqncy signal through once electricity mixing again, and this intermediate-freuqncy signal signal is expressed as EIF′T (), computing formula is such as
Under:
With formula (10), formula (5) shows that the phase place of this intermediate-freuqncy signal is identical with the phase place of the microwave signal of far-end photoproduction, therefore
We can characterize the performance of our photoproduction microwave dissemination system by intermediate-freuqncy signal carries out the analysis of phase noise.Fig. 2
Show that this intermediate-freuqncy signal is in phase compensation and the situation of phase drift in the case of not compensating, in the case of Fig. 2 phase place does not compensates, letter
Number phase drift exceeded 16 π, and in the case of Fig. 3 phase compensation, the noise suppressed ratio of phase place improves nearly 400 times, phase
Within position skew is maintained at 0.04 π.Fig. 4 show in the embodiment of the present invention spectrogram of the photoproduction microwave signal extracted, permissible
See that the rejection ratio of carrier wave and sideband, more than 30dB, which ensure that the purity of frequency spectrum of photoproduction microwave signal.
Present invention also offers the optical fiber distribution method of photoproduction microwave signal based on optical carrier suppression, including walking as follows
Rapid:
Step A: the optical signal that optical fiber laser sends is divided into two-way through 50:50 photo-coupler, a road needs for producing
The photoproduction microwave signal of transmission, another road is as local reference light.
Step B: the intermediate-freuqncy signal of phase precompensation first passes through a single side-band modulator and is modulated microwave signal,
Then the microwave signal modulated carries out carrier suppressed modulation by Mach zehnder modulators to optical signal again, the optical signal warp of modulation
Optical fiber link is transferred to user side.Another road microwave signal carries out light load by another one Mach Zeng De to the second road optical signal
Ripple suppression modulation, the optical signal of this modulation at local side as reference signal.
Step C: the optical signal being transferred to far-end first passes around the power attenuation of erbium-doped fiber amplifier compensated fiber link,
Then the frequency shift (FS) (for avoiding Fresnel reflection) of intermediate frequency is carried out.The optical signal that a part offsets is returned to local side and ginseng
Examine signal and carry out optical heterodyne beat frequency, be then passed through a series of signal and process acquisition phase error, and then carry out feedback compensation control.
Above the specific embodiment of the present invention is described.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make a variety of changes within the scope of the claims or revise, this not shadow
Ring the flesh and blood of the present invention.In the case of not conflicting, the feature in embodiments herein and embodiment can any phase
Combination mutually.
Claims (9)
1. the optical fiber dissemination system of a photoproduction microwave signal based on optical carrier suppression, it is characterised in that including: photoproduction microwave
Signaling module, phase detecting module, phase compensation block and system output module, wherein:
-described photoproduction microwave signal module, for generating the flashlight needing to be transferred to far-end and the local light being used as reference；
-described phase detecting module, shakes, because of optical fiber link, the phase jitter caused for detection, it is thus achieved that corresponding phase place letter
Breath；
-described phase compensation block, carries out phase-locked for the phase information detected according to phase detecting module, then controls pressure
The output of controlled oscillator, the microwave signal exported microwave signal generator by the output signal of voltage controlled oscillator carries out monolateral
Generating after band modulation and compensate signal, described compensation signal is for compensating the phase of light wave of flashlight；
-described system output module, for exporting the flashlight through phase compensation.
The optical fiber dissemination system of photoproduction microwave signal based on optical carrier suppression the most according to claim 1, its feature exists
In, described photoproduction microwave signal module includes: optical fiber laser (1), the first photo-coupler (2), first Mach of zehnder modulators
(3), the first power splitter (4), second Mach of zehnder modulators (7), microwave signal generator (5), rubidium clock source (6) and single-side belt
Manipulator (8), the optical signal that described optical fiber laser (1) sends is divided into two ways of optical signals after the first photo-coupler (2)；Its
In a road optical signal through first Mach of zehnder modulators (3), another road optical signal through second Mach of zehnder modulators (7),
One end of described microwave signal generator (5) is connected with rubidium clock source (6) and the other end of described microwave signal generator (5) will
The microwave signal generated is delivered to the first power splitter (4), wherein by the first power splitter (4) by defeated for the microwave signal of 10% ratio
Deliver to first Mach of zehnder modulators (3), the microwave signal of 90% ratio is carried after the RF mouth of single side-band modulator (8)
To second Mach of zehnder modulators (7).
The optical fiber dissemination system of photoproduction microwave signal based on optical carrier suppression the most according to claim 2, its feature exists
In, phase detecting module and phase compensation block collectively form compensation phase generating module, described compensation phase generating module bag
Include: the second photo-coupler (14), balance photodetector (15), digital frequency phase detector (11), loop filter (10), voltage-controlled
Agitator (9), the second power splitter (18), the first band filter (16), the second band filter (17), the 3rd band filter
(21), the 4th band filter (23), the 5th band filter (24), the first frequency mixer (19), the second frequency mixer (20), the 3rd
Frequency mixer (22)；After the reference signal that rubidium clock source (6) generates sequentially passes through digital frequency phase detector (11), loop filter (10)
Arriving voltage controlled oscillator (9), the oscillator signal that described voltage controlled oscillator (9) produces is divided into two-way, and a road transmission is adjusted to single-side belt
Device processed (8)；The transmission of another road is again split into two paths of signals to the second power splitter (18), and a road signal transmits to the first frequency mixer
(19), another road signal transmits to the second frequency mixer (20)；
The output signal of second Mach of zehnder modulators (7) enters the transmission of 100km optical fiber link through the first optical circulator (12)
To far-end, at far-end, then part output signal again passes by 100km optical fiber link and arrives local side, sequentially passes through the first light
Circulator (12), polarization state tracker (13) are at the output letter of the second photo-coupler (14) with first Mach of zehnder modulators (3)
Number couple, and the signal of coupling is divided into two-way by balance photodetector (15), road first band filter
(16) transmission is to the first frequency mixer (19), another road the second band filter (17) transmission to the second frequency mixer (20)；First
The output signal of frequency mixer (19) after the 3rd band filter (21) filtering with the filtered through the 4th band filter (23)
The output signal of two frequency mixers (20) mixes at three-mixer (22) place, and the output signal of three-mixer (22) is through multicolored vaginal discharge
Entering digital frequency phase detector (11) after bandpass filter (24) filtering, the reference signal that rubidium clock source (6) generate simultaneously enters numeral
Phase frequency detector (11), the signal that digital frequency phase detector (11) exports is used for controlling voltage-controlled shaking after loop filter (10)
Swing device (9) and generate phase compensation signal.
The optical fiber dissemination system of photoproduction microwave signal based on optical carrier suppression the most according to claim 1, its feature exists
In, described system output module includes: the second optical circulator (25), erbium-doped fiber amplifier (26), acousto-optic modulator (27), partially
Polarization state tracker (28), the 3rd photo-coupler (29) and high-speed wideband photodetector (30), through the signal of phase compensation
Light is transmitted through the fiber to far-end, and sequentially passes through the second optical circulator (25), erbium-doped fiber amplifier (26), acousto-optic modulator
(27), polarization state tracker (28) transmission to the 3rd photo-coupler (29), be divided into two paths of signals, a road signal transmission is at a high speed
Wideband photodetectors (30) exports afterwards, and another road signal enters the second optical circulator (25) and passes back to local side.
The optical fiber dissemination system of photoproduction microwave signal based on optical carrier suppression the most according to claim 2, its feature exists
In, described optical fiber laser (1) is the optical fiber laser of narrow linewidth, and live width is 1KHz.
The optical fiber dissemination system of photoproduction microwave signal based on optical carrier suppression the most according to claim 2, its feature exists
In, described single side-band modulator (8) including: LO port, IF port and RF port, the LO end of described single side-band modulator (8)
Mouth input 10GHz microwave signal, the IF port of single side-band modulator (8) is connected with voltage controlled oscillator (9), described single sideband modulation
The RF port of second Mach of zehnder modulators (7) of the RF port of device (8) is connected.
The optical fiber dissemination system of photoproduction microwave signal based on optical carrier suppression the most according to claim 3, its feature exists
In, the phase jitter that described balance photodetector (15) is used in optical wavelength magnitude causing because of optical fiber link shake is carried out
Phase demodulation.
The optical fiber dissemination system of photoproduction microwave signal based on optical carrier suppression the most according to claim 3, its feature exists
After the frequency signal that the 5th band filter (24) inputs is divided by, described digital frequency phase detector (11) again with rubidium clock
The rubidium clock signal in source (6) carries out phase demodulation；Specifically, the frequency signal of the 5th band filter (24) input 140MHz, through numeral
The signal of 10MHz is generated, the 10MHz sent by the 10MHz signal after frequency dividing with rubidium clock source (6) after phase frequency detector (11) frequency dividing
Rubidium clock signal carry out phase demodulation.
9. the optical fiber distribution method of a photoproduction microwave signal based on optical carrier suppression, it is characterised in that comprise the steps:
Photoproduction microwave signal generation step: generate the flashlight needing to be transferred to far-end and the local light being used as reference；
Phase detection step: detect because optical fiber link shakes the phase jitter caused, it is thus achieved that corresponding phase information；
Phase compensation step: the phase information for detecting according to phase detecting module controls the output of voltage controlled oscillator, logical
Cross to generate after the microwave signal that microwave signal generator exports by the output signal of voltage controlled oscillator carries out single sideband modulation and compensate
Signal, described compensation signal is for compensating the phase of light wave of flashlight；
System output step: export the flashlight through phase compensation at far-end.
Priority Applications (1)
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| CN107465107A (en) * | 2017-09-18 | 2017-12-12 | 江汉大学 | A kind of self-compensation type semiconductor laser apparatus |
| CN108011667A (en) * | 2017-11-28 | 2018-05-08 | 中国科学院国家授时中心 | Frequency conversion compensation microwave frequency transmission system and method |
| CN108155539A (en) * | 2018-01-18 | 2018-06-12 | 西南大学 | A kind of narrow linewidth photon microwave generator being continuously adjusted on a large scale |
| CN109547115A (en) * | 2018-09-21 | 2019-03-29 | 上海交通大学 | High efficiency far end radio frequency signal down conversion system and method based on sideband light locking phase |
| CN110824888A (en) * | 2018-08-09 | 2020-02-21 | 中国计量科学研究院 | Signal acquisition method and device applied to atomic fountain clock |
| CN110868646A (en) * | 2019-11-28 | 2020-03-06 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Transmitting base station with water-cooling monitoring device |
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| CN112751621A (en) * | 2020-12-21 | 2021-05-04 | 中国科学院国家授时中心 | Optical fiber microwave frequency transmission system based on laser frequency deviation locking |
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| CN113783612A (en) * | 2021-09-18 | 2021-12-10 | 中国电子科技集团公司第三十四研究所 | Calibration device of optical fiber phase-stabilized transmission equipment |
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| CN108011667B (en) * | 2017-11-28 | 2020-04-07 | 中国科学院国家授时中心 | Frequency conversion compensation microwave frequency transmission system and method |
| CN108011667A (en) * | 2017-11-28 | 2018-05-08 | 中国科学院国家授时中心 | Frequency conversion compensation microwave frequency transmission system and method |
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| CN111064474B (en) * | 2019-12-24 | 2021-06-22 | 中国科学院西安光学精密机械研究所 | High-speed laser-microwave link serial-parallel conversion method |
| CN111064474A (en) * | 2019-12-24 | 2020-04-24 | 中国科学院西安光学精密机械研究所 | High-speed laser-microwave link serial-parallel conversion method |
| CN111953342A (en) * | 2020-08-10 | 2020-11-17 | 东南大学 | Double-ring photoelectric oscillator with active phase noise suppression circuit |
| CN112751621A (en) * | 2020-12-21 | 2021-05-04 | 中国科学院国家授时中心 | Optical fiber microwave frequency transmission system based on laser frequency deviation locking |
| CN112751621B (en) * | 2020-12-21 | 2023-11-07 | 中国科学院国家授时中心 | Optical fiber microwave frequency transmission system based on laser frequency offset locking |
| CN113346946A (en) * | 2021-05-28 | 2021-09-03 | 天津师范大学 | Optical fiber delay change measuring device and measuring method based on microwave photons |
| CN113346946B (en) * | 2021-05-28 | 2022-04-12 | 天津师范大学 | Optical fiber delay change measuring device and measuring method based on microwave photons |
| CN113783612A (en) * | 2021-09-18 | 2021-12-10 | 中国电子科技集团公司第三十四研究所 | Calibration device of optical fiber phase-stabilized transmission equipment |
| CN113783612B (en) * | 2021-09-18 | 2023-06-20 | 中国电子科技集团公司第三十四研究所 | Calibrating device of optical fiber stable phase transmission equipment |
| CN114793137A (en) * | 2022-04-12 | 2022-07-26 | 南京航空航天大学 | Local oscillation distribution method and system based on photoelectric oscillation loop |
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