CN107682087A - A kind of steady phase transmission method of microwave optical fiber for eliminating local oscillator leakage in passive phase correction - Google Patents
A kind of steady phase transmission method of microwave optical fiber for eliminating local oscillator leakage in passive phase correction Download PDFInfo
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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
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25758—Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
- H04B10/25759—Details of the reception of RF signal or the optical conversion before the optical fibre
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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
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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
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0272—Transmission of OAMP information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2210/00—Indexing scheme relating to optical transmission systems
- H04B2210/25—Distortion or dispersion compensation
- H04B2210/252—Distortion or dispersion compensation after the transmission line, i.e. post-compensation
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Abstract
The invention discloses a kind of steady phase transmission method of microwave optical fiber for eliminating local oscillator leakage in passive phase correction.Central station transmits modulated be loaded on optical signal to distant-end node of target microwave signal, and the microwave signal of reception is divided into two-way with power splitter, carries out frequency tripling all the way by distant-end node, and another way is back to central station.In central station, it is modulated to after the optical signal received is carried out into opto-electronic conversion on the light source of the 3rd different wave length, it is sent to distant-end node again by wavelength division multiplexer and carries out photodetection and bandpass filtering, the microwave signal of output is first mixed with fundamental frequency signal component, after bandpass filtering and frequency signal is mixed with frequency tripling component of signal, difference frequency signal after bandpass filtering is mixed with fundamental frequency signal component again, the microwave signal of output being divided with frequency signal by two-divider after bandpass filtering, obtain the target microwave signal of phase stabilization.The steady phase required time of microwave is short in the present invention, quality is high, and eliminates in traditional passive method for correcting phase by being mixed the local oscillator leakage signal introduced.
Description
Technical field
The present invention relates to local oscillator in a kind of transmission method of microwave signal, more particularly to a kind of elimination passive phase correction to let out
The steady phase transmission method of microwave optical fiber of dew, belongs to Microwave photonics technology, microwave engineering techniques field.
Background technology
In radio astronomy, deep space network, distributed SAR system system, high precision clock standard profile and grain
In the application such as sub- accelerator, receiver is positioned using carrier phase, therefore is required benchmark microwave signal or local oscillator
Signal is transmitted to another website with the phase place change of minimum.And microwave photon technology have transmission loss it is small, with roomy, anti-electricity
The features such as magnetic disturbance, light and flexible, but using optical fiber transmission technique due to by uncontrollable environment temperature and mechanical stress change
The influence of change, cause the phase of signal that the drift of randomness occurs, greatly affected the quality of microwave signal.
Two major classes are broadly divided into the research transmitted to the steady phase of microwave signal at present, first, Active phase corrects system, often
It is by being back to central station after carrying out a signal transmission, extracting with the phase error of central station local oscillation signal to control with method
The link parameter of optical fiber processed, with this Active Compensation because external environment phase as caused by temperature and mechanical stress etc. are transmitted to optical fiber
Position shake.Relatively conventional at present is to carry out feedback compensation by using optical electrical delay line and voltage controlled oscillator etc..It is main to lack
Point is to employ complicated circuit to carry out the extraction of phase error, adds the noise of system, and when bad environments, light
The change of fine length may exceed the scope of phase compensation and the speed of steady phase is relatively slow.Second, passive phasing system
System, common method are being mixed come passive elimination phase perturbation by electrical domain, and The method avoids complex phase
The extraction detection of error and backfeed loop, and steady phase velocity is relatively fast.But this method can have microwave at mixing
Signal itself beat frequency and the problems such as the local oscillator leakage introduced.(F.Yin,A.Zhang,Y.Dai,T.Ren,K.Xu,J.Li,
J.Lin,and G.Tang,“Phase-conjugation-based fast RF phase stabilization for
fiber delivery”Opt.Express vol.22,no.1,2014.)
The content of the invention
In view of the deficiency above of prior art, the present invention is intended to provide a kind of eliminate local oscillator leakage in passive phase correction
The steady phase transmission method of microwave optical fiber, to overcome traditional Active phase to correct in steady phase method the slow inferior position of phasing simultaneously
Solves the problems, such as the defects of local oscillator leakage in passive method for correcting phase.
To reach above-mentioned purpose, the microwave optical fiber provided by the invention for eliminating local oscillator leakage in passive phase correction surely passes on from one to another
Transmission method includes central station and distant-end node, its means specifically used for：
A kind of steady phase transmission method of microwave optical fiber for eliminating local oscillator leakage in passive phase correction, it is characterised in that：Pass through
Target microwave signal is loaded into optical signal by the central station and distant-end node of single-mode fiber connection, central station by electro-optical modulation
On, transmitted to distant-end node；
In distant-end node, it is divided into two with power splitter after the microwave signal progress photodetection and bandpass filtering by reception
Road, carries out frequency tripling all the way, and another way is back to central station；In central station, after the optical signal received is carried out into opto-electronic conversion
It is modulated on the light source of the 3rd different wave length, is sent to distant-end node again by wavelength division multiplexer and carries out photodetection and band
Pass filter, the microwave signal of output are first mixed with fundamental frequency signal component, after bandpass filtering and frequency signal and three times
Frequency component of signal is mixed, and the difference frequency signal after bandpass filtering is mixed with fundamental frequency signal component again, the microwave of output
Signal handle after filtering after and frequency signal divided by two-divider, obtain the target microwave signal of phase stabilization.
The steady phase required time of microwave is short in the present invention, quality is high, and eliminates direct conversion in traditional passive method for correcting phase and draw
The local oscillator leakage signal entered；
In central station, it is λ that first laser source, which produces wavelength,0Optical signal, target microwave signal is applied to the first horse
Conspicuous Zeng Deer modulators are supplied to the first wavelength division multiplexer after carrying out intensity modulated to optical signal；First wavelength division multiplexer will
The intensitymodulated optical signals of first MZ Mach-Zehnder output and the microwave signal transmission of central station is back to the first light
Circulator；It is λ that 3rd lasing light emitter, which produces wavelength,2Optical signal, the microwave signal of passback passes through the first image intensifer and the second light
Electric explorer and the second bandpass filter it is after-applied to the 3rd MZ Mach-Zehnder to optical signal carry out intensity modulated after carry
Supply the first wavelength division multiplexer；
Distant-end node includes：Second wavelength division multiplexer is used to the optical signal of three different wave lengths being divided into three channels and incited somebody to action
The modulated optical signal of distant-end node is in λ1Channel passes through fiber pass-back to central station；What the first photodetector sent central station
Modulated optical signal carries out opto-electronic conversion, and is supplied to the first bandpass filter；The microwave signal that the docking of first bandpass filter is received
It is filtered processing；Filtered microwave signal is divided into two-way by the first power splitter, carries out frequency tripling all the way, and another way passes through
Two MZ Mach-Zehnders are back to central station and carry out round-trip transmission after being modulated on second laser source；Frequency tripler is by first
The microwave signal of power splitter output carries out frequency tripling, and the microwave signal of component of signal and round-trip transmission after frequency multiplication is mixed；
It is λ that second laser source, which produces and is back to wavelength needed for central station,1Optical signal；3rd photodetector enters the optical signal of reception
Row opto-electronic conversion, and the 3rd bandpass filter is supplied to, filter center frequency is the frequency of target microwave signal；Pass through the second electricity
Amplifier is mixed after being amplified processing with fundamental frequency signal component by the first frequency mixer；The signal of mixing is passed through the 4th
Bandpass filter, filter center frequency are mixed frequency signal and frequent rate；After filtering and frequency signal and frequency tripling signal point
Amount is mixed by the second frequency mixer；The signal of mixing is believed by the 5th bandpass filter, filter center frequency for mixing
Number beat frequency；Difference frequency signal after filtering is mixed with identical fundamental frequency signal component by three-mixer；Will
For the signal of mixing by the 6th bandpass filter, filter center frequency is mixed frequency signal and frequent rate；After filtering and frequency
Signal is divided by two-divider, finally obtains the target microwave signal of phase stabilization in distant-end node.
Further, there is the lasing light emitter of two different wave lengths in central station, microwave signal is modulated to Different lightwave length multiple
Transmit through same root optical fiber after, be concerned with the optical signal reduced because of phase co-wavelength in same root light caused by round-trip transmission
The influence of rayleigh noise.
Further, it is direct by the signal of frequency tripling component of signal and round-trip transmission in traditional passive method for correcting phase
It is mixed, can be existed because of two times of microwave signal frequencies caused by target microwave signal itself beat frequency in filtered difference frequency signal
Local oscillator leakage, cause phase perturbation can not be completely eliminated.In this method, it is respectively arranged with before and after the second frequency mixer
First frequency mixer and three-mixer, the filtering process with the mixing of fundamental frequency signal component and corresponding centre frequency is carried out, has been kept away
Exempted from conventional method mixing when because of beat frequency and caused by microwave signal local oscillator leakage, so as to eliminate caused phase in fiber link
Phase perturbation.
So, the optical signal of three different wave lengths is divided into three channels and by the tune of distant-end node by the second wavelength division multiplexer
Optical signal processed is in λ1Channel passes through fiber pass-back to central station, wherein λ0Channel connects first photodetector by reception
Optical signal carries out opto-electronic conversion, and is supplied to first bandpass filter to be filtered, and filter center frequency is target microwave
Signal frequency, the microwave signal for filtering output connects first power splitter, microwave signal is divided into two-way, all the way described in connection
Frequency tripler carries out frequency tripling, and it is λ that another way is modulated to wavelength by the second MZ Mach-Zehnder1Second laser source on
After be back to central station and carry out round-trip transmission, the microwave signal that returns again, which connects second wavelength division multiplexer, will modulate light letter
Number transmit to the 3rd photodetector and carry out opto-electronic conversion, and be supplied to the 3rd bandpass filter, filter center frequency is
Target microwave signal frequency, the microwave signal for filtering output connect second electric amplifier, and the microwave signal by amplification connects
Connect the first frequency mixer and fundamental frequency signal component is mixed, the signal after mixing is supplied to the 4th bandpass filter, filter center
Frequency is mixing and frequency signal frequency, and the microwave signal for filtering output connects second frequency mixer and frequency tripling component of signal
It is mixed, the signal after mixing is supplied to the 5th bandpass filter, and filter center frequency is the difference frequency signal frequency of mixing, is filtered
The microwave signal of ripple output connects the three-mixer and fundamental frequency signal component is mixed, and the signal after mixing is supplied to the
Six bandpass filters, filter center frequency are mixing and frequency signal frequency, filter described two points of the microwave signal connection of output
Frequency device is divided, and finally obtains the target microwave signal of phase stabilization in distant-end node.
It can be seen from the above technical proposal that the invention has the advantages that：
1st, the present invention only needs after optical fiber is transmitted to distal end and local oscillation signal and fundamental frequency of the another way Jing Guo round-trip transmission
Component of signal is mixed, you can eliminates the phase perturbation introduced after microwave signal is transmitted in a fiber, it is not necessary to pass through complexity
Circuit design extract the information of phase perturbation to compensate, reduce the complexity of system, and needed for phasing
Time is time of the optical signal in fiber link round-trip transmission, it is possible to achieve fast phase corrects.
2nd, the present invention can eliminate the local oscillator leakage in traditional passive method for correcting phase, in traditional passive phasing
The front and rear filtering process carried out respectively with the mixing of fundamental frequency signal component and corresponding centre frequency of second frequency mixer, is avoided
Conventional method be mixed when because of beat frequency and caused by microwave signal local oscillator leakage, disturbed so as to eliminate caused phase in fiber link
It is dynamic.
Brief description of the drawings：
Fig. 1 is a kind of structure for eliminating the steady phase transmission method of microwave optical fiber of local oscillator leakage in passive phase correction of the present invention
Schematic diagram；
Fig. 2 is a kind of system for eliminating the steady phase transmission method of microwave optical fiber of local oscillator leakage in passive phase correction of the present invention
Block diagram；
Fig. 3 is that the stabilized fiber of present invention elimination passive phase correction local oscillator leakage mutually transmits schematic diagram.
Embodiment
Technical scheme is described in detail below in conjunction with the accompanying drawings：
Fig. 1 is a kind of structure for eliminating the steady phase transmission method of microwave optical fiber of local oscillator leakage in passive phase correction of the present invention
Schematic diagram, Fig. 2 are a kind of system for eliminating the steady phase transmission method of microwave optical fiber of local oscillator leakage in passive phase correction of the present invention
Block diagram.As shown in Fig. 2 the microwave signal stabilized fiber phase transmission method includes central station and distant-end node, the central station and
Distant-end node is transmitted by single-mode fiber, wherein：
The central station includes：Microwave signal source 1011, lasing light emitter 1021, MZ Mach-Zehnder 1031, lasing light emitter
1022nd, MZ Mach-Zehnder 1032, wavelength division multiplexer 1041, optical circulator 1051, fiber amplifier 1061, photodetection
Device 1071, bandpass filter 1081, wherein：
The microwave signal source 1011 is used to produce the target microwave signal for needing steady mutually transmission；
It is λ that the lasing light emitter 1021, which is used to produce wavelength,0Optical signal, target microwave signal and central station will be back to
Signal is supplied to wavelength-division multiplex after being applied separately to MZ Mach-Zehnder 1031 and 1032 pairs of optical signals progress intensity modulateds
Device 1041；
The intensity-modulated light that the wavelength division multiplexer 1041 is used to export MZ Mach-Zehnder 1031 and 1032 is believed
Number and be back to the microwave signal transmission of central station to optical circulator 1051；
The EDFA Erbium-Doped Fiber Amplifier 1061 be used for amplify compensated optical signal by fiber link transmission in because dispersion etc. because
Power attenuation caused by element；
The photodetector 1071 is used to the modulated optical signal for being back to central station carrying out opto-electronic conversion, and is supplied to
Bandpass filter 1081；
The bandpass filter 1081 is used to be filtered the microwave signal received processing, and filter center frequency is micro-
The frequency of ripple signal 1011；
It is λ that the lasing light emitter 1022, which is used to produce wavelength,2Optical signal, the signal that will be filtered by bandpass filter 1081
It is applied to after MZ Mach-Zehnder 1032 carries out intensity modulated to optical signal and is supplied to wavelength division multiplexer 1041；
The distant-end node includes：It is wavelength division multiplexer 2011, photodetector 2021, bandpass filter 2031, electrically amplified
Device 2041, power splitter 20/51, frequency tripler 2101, lasing light emitter 2061, MZ Mach-Zehnder 2071, photodetector
2022nd, bandpass filter 2032, electric amplifier 2042, fundamental frequency signal component source 2091, frequency mixer 2081, bandpass filter
2033rd, frequency mixer 2082, bandpass filter 2034, frequency mixer 2083, bandpass filter 2035, two-divider 2111, wherein：
The wavelength division multiplexer 2011 is used for the different wave length of lasing light emitter 1021, lasing light emitter 1022 and lasing light emitter 2061 point
For three channels and by the modulated optical signal of distant-end node in λ1Channel passes through fiber pass-back to central station；
The modulated optical signal that the photodetector 2021 is used to send central station carries out opto-electronic conversion, and is supplied to band
Bandpass filter 2031；
The bandpass filter 2031 is used to be filtered the microwave signal received processing, and filter center frequency is micro-
The frequency of ripple signal 1011；
The electric amplifier 2041 is used to carry out power amplification to filtered electric signal；
The power splitter 2051 is used to filtered microwave signal being divided into two-way, carries out frequency tripling all the way, another way is led to
Cross after MZ Mach-Zehnder adjusts 2071 systems to lasing light emitter 2061 and be back to central station progress round-trip transmission；
The microwave signal that the frequency tripler 2101 is used to export power splitter 2051 carries out frequency tripling, the signal after frequency multiplication
Component through 2033 filtered microwave signal of bandpass filter with being mixed；
It is λ that the lasing light emitter 2061 is back to wavelength needed for central station for generation1Optical signal；
The photodetector 2022 is used to the optical signal of reception carrying out opto-electronic conversion, and is supplied to bandpass filter
2032；
The bandpass filter 2032 is used to be filtered the microwave signal that photodetector 2022 exports, filter center
Frequency is the frequency of microwave signal；
The electric amplifier 2042 is used to carry out power amplification to filtered electric signal；
The fundamental frequency signal component source 2091 is used to produce the fundamental frequency signal component being mixed；
The frequency mixer 2081 is used for the microwave signal for exporting electric amplifier 2042 and is produced from fundamental frequency signal component source 2091
Raw fundamental frequency signal component is mixed；
The bandpass filter 2033 is used to be filtered the microwave signal that frequency mixer 2081 exports, filter center frequency
For microwave signal 1011 and fundamental frequency signal component 2091 and frequency；
The frequency mixer 2082 is used for caused by the microwave signal for exporting bandpass filter 2033 and frequency tripler 2101
Frequency tripling component of signal is mixed；
The bandpass filter 2034 is used to be filtered the microwave signal that frequency mixer 2082 exports, filter center frequency
The difference frequency of microwave signal is exported for frequency tripling component of signal 2101 and bandpass filter 2033；
The frequency mixer 2083 is used for microwave signal and the fundamental frequency signal component source 2091 for exporting bandpass filter 2034
Caused fundamental frequency signal component is mixed；
The bandpass filter 2035 is used to be filtered the microwave signal that frequency mixer 2083 exports, filter center frequency
Export microwave signal and fundamental frequency signal component 2091 for bandpass filter 2034 and frequency；
The two-divider 2111 is used to carry out two divided-frequency to the microwave signal that bandpass filter 2035 exports, finally remote
End node obtains the microwave signal 1011 of phase stabilization.
Fig. 3 is the schematic diagram that the present invention eliminates local oscillator leakage in passive phase correction, for the ease of the public understanding present invention
Technical scheme, its principle is further described below：
Assuming that target microwave signal waiting for transmission is (ignoring amplitude):
Wherein ω0WithThe angular frequency and initial phase of target microwave signal, ω are represented respectivelyrefWithBase is represented respectively
The angular frequency and initial phase of frequency component of signal, cos () represent cosine function, and t represents the time.
After MZ Mach-Zehnder is modulated on light, distant-end node is transferred to by single-mode fiber：
WhereinFor the phase perturbation of fiber link.Microwave signal is filtered out with bandpass filter after photodetector,
Central station is passed back to after carrying out intensity modulated to optical signal by MZ Mach-Zehnder, after the devices such as wavelength division multiplexer
Distant-end node is transferred to again：
Traditional passive method for correcting phase is expressed as to be mixed with (4) formula after (3) formula progress frequency tripling, obtains：
After two-divider frequency dividing and bandpass filter are filtered processing, target microwave signal, but this can be reverted to
When filtered signal in still have as caused by microwave signal itself beat frequency local oscillator leakage, cause phase perturbation complete
Eliminate.(2) formula and (4) formula are mixed and are filtered processing to itself and frequency signal by the method first, are obtained：
The frequency tripling component of signal of (6) formula and (3) formula is mixed and processing is filtered to its difference frequency signal, is obtained
Arrive：
(7) formula and (2) formula are mixed and processing is filtered to itself and frequency signal, is obtained：
Two divided-frequency is carried out to (8) formula, obtained：
Processing is filtered through bandpass filter, finally gives the target microwave signal of phase stabilization.
In summary state, the present invention has following feature.1) the present invention only needs after optical fiber is transmitted to distal end and another
Local oscillation signal of the road Jing Guo round-trip transmission is mixed, you can is eliminated the phase introduced after microwave signal is transmitted in light and is disturbed
It is dynamic, it is not necessary to phase jitter information is extracted to compensate by the circuit design of complexity, reduces the complexity of system, and
And phasing required time is the time of fiber link round-trip transmission, it is possible to achieve fast phase corrects.2) the present invention can be with
The local oscillator leakage in traditional passive method for correcting phase is eliminated, has been carried out respectively before and after the second frequency mixer and fundamental frequency signal point
The mixing of amount and the filtering process of corresponding centre frequency, when avoiding conventional method mixing because of beat frequency and caused by microwave signal
Local oscillator leakage, so as to eliminate caused phase perturbation in fiber link.
Set forth above is only the preferred embodiment of the present invention, it is noted that do not depart from the inventive method and
On the premise of core apparatus essence, some changes and polishing can be made in actually implementing should also be included in the protection of the present invention
Within scope.
Claims (2)
- A kind of 1. steady phase transmission method of microwave optical fiber for eliminating local oscillator leakage in passive phase correction, it is characterised in that：Pass through list Mode fiber connects central station and target microwave signal is loaded on optical signal by distant-end node, central station by electro-optical modulation, to Distant-end node transmits；In distant-end node, the microwave signal of reception is carried out to be divided into two-way with power splitter after photodetection and bandpass filtering, one Road carries out frequency tripling, and another way is back to central station；In central station, it is modulated to after the optical signal received is carried out into opto-electronic conversion On the light source of 3rd different wave length, it is sent to distant-end node again by wavelength division multiplexer and carries out photodetection and band logical filter Ripple, the microwave signal of output are first mixed with fundamental frequency signal component, after filtering after and frequency signal and frequency tripling signal divide Amount is mixed, and the difference frequency signal after bandpass filtering is mixed with fundamental frequency signal component again, and the microwave signal of output is passed through After filtering process and frequency signal is divided by two-divider, obtains the target microwave signal of phase stabilization；In central station, it is λ that first laser source, which produces wavelength,0Optical signal, target microwave signal is applied to first Mach of Zeng De Your modulator is supplied to the first wavelength division multiplexer after carrying out intensity modulated to optical signal；First wavelength division multiplexer is by the first horse The intensitymodulated optical signals of conspicuous Zeng Deer modulators output and the microwave signal transmission of central station is back to the first optical circulator； It is λ that 3rd lasing light emitter, which produces wavelength,2Optical signal, the microwave signal of passback passes through the first image intensifer and the second photodetector And second bandpass filter it is after-applied to the 3rd MZ Mach-Zehnder to optical signal carry out intensity modulated after be supplied to first Wavelength division multiplexer；Distant-end node includes：Second wavelength division multiplexer is used to the optical signal of three different wave lengths being divided into three channels and by distally The modulated optical signal of node is in λ1Channel passes through fiber pass-back to central station；The modulation that first photodetector sends central station Optical signal carries out opto-electronic conversion, and is supplied to the first bandpass filter；The microwave signal that the docking of first bandpass filter is received is carried out Filtering process；Filtered microwave signal is divided into two-way by the first power splitter, carries out frequency tripling all the way, and another way passes through the second horse Conspicuous Zeng Deer modulators modulates are back to central station to after on second laser source and carry out round-trip transmission；Frequency tripler divides the first work( The microwave signal of device output carries out frequency tripling, and the microwave signal of component of signal and round-trip transmission after frequency multiplication is mixed；Second It is λ that lasing light emitter, which produces and is back to wavelength needed for central station,1Optical signal；The optical signal of reception is carried out light by the 3rd photodetector Electricity conversion, and the 3rd bandpass filter is supplied to, filter center frequency is the frequency of target microwave signal；It is electrically amplified by second Device is mixed after being amplified processing with fundamental frequency signal component by the first frequency mixer；The signal of mixing is passed through into the 4th band logical Wave filter, filter center frequency are mixed frequency signal and frequent rate；After filtering and frequency signal lead to frequency tripling component of signal The second frequency mixer is crossed to be mixed；By the signal of mixing by the 5th bandpass filter, filter center frequency is mixed frequency signal Beat frequency；Difference frequency signal after filtering is mixed with identical fundamental frequency signal component by three-mixer；Will mixing Signal by the 6th bandpass filter, filter center frequency is mixed frequency signal and frequent rate；After filtering and frequency signal Divided by two-divider, finally obtain the target microwave signal of phase stabilization in distant-end node.
- 2. the microwave optical fiber steady phase transmission method according to claim 1 for eliminating local oscillator leakage in passive phase correction, its It is characterised by there is the lasing light emitter of two different wave lengths in central station, microwave signal is modulated to after Different lightwave length multiplexing through same A piece optical fiber transmission, and carried out respectively and the mixing of fundamental frequency signal component and corresponding centre frequency before and after the second frequency mixer Filtering process.
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| CN108398691A (en) * | 2018-05-25 | 2018-08-14 | 中国工程物理研究院流体物理研究所 | A kind of difference frequency signal generation device and method |
| CN110995358A (en) * | 2019-12-13 | 2020-04-10 | 南京航空航天大学 | Microwave phase shifting method and device and high-stability photo-generated microwave source |
| CN112367120A (en) * | 2020-10-23 | 2021-02-12 | 西北工业大学 | Microwave local oscillation source double-frequency optical fiber phase-stabilizing transmission system |
| WO2021184548A1 (en) * | 2020-03-20 | 2021-09-23 | Dalian University Of Technology | Optical-electronic integrated rf leakage interference cancellation system and method for cw radar |
| CN114326924A (en) * | 2022-03-03 | 2022-04-12 | 阿里巴巴达摩院(杭州)科技有限公司 | Signal processing method and storage medium |
| CN116366161A (en) * | 2023-02-03 | 2023-06-30 | 华北电力大学（保定） | Optical fiber ring network radio frequency signal stable transmission system |
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| CN114326924A (en) * | 2022-03-03 | 2022-04-12 | 阿里巴巴达摩院(杭州)科技有限公司 | Signal processing method and storage medium |
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