CN107682087B - 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 methods of microwave optical fiber of local oscillator leakage in elimination passive phase correction.Central station transmits modulated be loaded on optical signal to distant-end node of target microwave signal, and received microwave signal 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 on the light source of third different wave length after the optical signal received is carried out photoelectric conversion, 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 signal component, 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 the local oscillator leakage signal introduced in traditional passive method for correcting phase by mixing.
Description
Technical field
The present invention relates to local oscillators in a kind of transmission method of microwave signal more particularly to a kind of correction of elimination passive phase to let out
The steady phase transmission method of the microwave optical fiber of dew, belongs to Microwave photonics technology, microwave engineering techniques field.
Background technique
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 smallest phase change.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 causes the phase of signal that the drift of randomness occurs, greatly affected the quality of microwave signal.
Two major classes are being broadly divided into the research that microwave signal is surely mutually transmitted at present, first is that Active phase corrects system, often
It is to extract the phase error with central station local oscillation signal by being back to central station after carrying out a signal transmission to control with method
The link parameter of optical fiber processed, with this Active Compensation because external environment such as temperature and mechanical stress etc. is to phase caused by optical fiber transmission
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 the extraction that phase error is carried out using complicated circuit, increases the noise of system, and when bad environments, light
The variation of fine length may exceed the range of phase compensation and the speed of steady phase is relatively slow.Second is that passive phasing system
System, common method is passively to eliminate phase perturbation by the mixing of electrical domain, and The method avoids more complicated phases
The extraction detection of error and feedback 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.)
Summary of the invention
In view of the above deficiency of the 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 disadvantage of phasing simultaneously
Solve the defect problem of local oscillator leakage in passive method for correcting phase.
In order to achieve the above objectives, 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, the means specifically used are as follows:
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 electro-optical modulation by the central station and distant-end node of single mode optical fiber connection, central station
On, it is transmitted to distant-end node；
In distant-end node, two will be divided into power splitter after the progress photodetection of received microwave signal and bandpass filtering
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 photoelectric conversion
It is modulated on the light source of third 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 signal component is mixed, and the difference frequency signal after bandpass filtering is mixed with fundamental frequency signal component again, the microwave of output
Signal being divided with frequency signal by two-divider after filtering processing, obtains 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, first laser source generation wavelength is λ0Optical signal, target microwave signal is applied to the first horse
Conspicuous Zeng Deer modulator is 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；Third laser source generation wavelength is λ2Optical signal, the microwave signal of passback passes through the first image intensifer and the second light
It is applied to after third MZ Mach-Zehnder carries out intensity modulated to optical signal and mentions after electric explorer and the second bandpass filter
Supply the first wavelength division multiplexer；
Distant-end node includes: that the second wavelength division multiplexer is used to for the optical signal of three different wave lengths to be divided into three channels and incite somebody to action
The modulated optical signal of distant-end node is in λ1Channel passes through fiber pass-back to central station；First photodetector issues central station
Modulated optical signal carries out photoelectric conversion, and is supplied to the first bandpass filter；The microwave signal that the docking of first bandpass filter is received
It is filtered；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
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 signal component after frequency multiplication is mixed with the microwave signal of round-trip transmission；
It is λ that second laser source, which generates and is back to wavelength needed for central station,1Optical signal；Third photodetector by received optical signal into
Row photoelectric conversion, and it is supplied to third bandpass filter, filter center frequency is the frequency of target microwave signal；Pass through the second electricity
Amplifier is mixed with fundamental frequency signal component by the first frequency mixer after amplifying processing；The signal of mixing is passed through the 4th
Bandpass filter, filter center frequency are mixed frequency signal and frequent rate；Filtered and frequency signal and frequency tripling signal point
Amount is mixed by the second frequency mixer；By the signal of mixing by the 5th bandpass filter, filter center frequency is mixing letter
Number beat frequency；Filtered difference frequency signal is mixed with identical fundamental frequency signal component by third frequency mixer；It will
For the signal of mixing by the 6th bandpass filter, filter center frequency is mixed frequency signal and frequent rate；Filtered and frequency
Signal is divided by two-divider, finally obtains the target microwave signal of phase stabilization in distant-end node.
Further, in central station, there are two the laser sources of different wave length, so that microwave signal is modulated to Different lightwave long multiple
It is transmitted after through same root optical fiber, with reduction because the optical signal of phase co-wavelength is concerned with caused by round-trip transmission in same root light
The influence of rayleigh noise.
Further, the signal in traditional passive method for correcting phase by frequency tripling signal component and round-trip transmission is direct
It is mixed, can there is the two times of microwave signal frequencies generated by itself beat frequency of target microwave signal 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 third frequency mixer keep away with the filtering processing of the mixing of fundamental frequency signal component and corresponding centre frequency
The local oscillator leakage for having exempted from the microwave signal generated when conventional method mixing by beat frequency, to eliminate caused phase in optical fiber link
Phase perturbation.
In this way, 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 by fiber pass-back to central station, wherein λ0Channel connects first photodetector will be received
Optical signal carries out photoelectric conversion, and is supplied to first bandpass filter and is 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, which is modulated to wavelength by the second MZ Mach-Zehnder,1Second laser source on
After be back to central station and carry out round-trip transmission, the microwave signal that returns again connects second wavelength division multiplexer and believes modulation light
It number is transmitted to third photodetector and carries out photoelectric conversion, and be supplied to the third 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
It connects 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 with frequency signal frequency, and the microwave signal for filtering output connects second frequency mixer and frequency tripling signal component
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, filter
The microwave signal of wave output connects the third frequency 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 with frequency signal frequency, and the microwave signal for filtering output connects described two points
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 following advantages:
1, the present invention only needs for optical fiber to be transmitted to behind distal end and local oscillation signal and fundamental frequency of the another way Jing Guo round-trip transmission
Signal component is mixed, and can be eliminated the phase perturbation introduced after microwave signal is transmitted in a fiber, not needed to pass through complexity
Circuit design compensated to extract the information of phase perturbation, reduce the complexity of system, and needed for phasing
Time is optical signal in the time of optical fiber link round-trip transmission, and fast phase correction may be implemented.
2, the present invention can eliminate the local oscillator leakage in traditional passive method for correcting phase, in traditional passive phasing
The front and back of second frequency mixer has carried out avoiding with the filtering processing of the mixing of fundamental frequency signal component and corresponding centre frequency respectively
The local oscillator leakage for the microwave signal that conventional method generates when being mixed by beat frequency, is disturbed to eliminate caused phase in optical fiber link
It is dynamic.
Detailed description of the invention:
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.
Specific embodiment
Technical solution of the present invention is described in detail with reference to the accompanying drawing:
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 optical fiber, in which:
The central station includes: microwave signal source 1011, laser source 1021, MZ Mach-Zehnder 1031, laser source
1022, MZ Mach-Zehnder 1032, wavelength division multiplexer 1041, optical circulator 1051, fiber amplifier 1061, photodetection
Device 1071, bandpass filter 1081, in which:
The microwave signal source 1011 is used to generate the target microwave signal for needing steady mutually transmission；
The laser source 1021 is λ for generation wavelength0Optical signal, target microwave signal and central station will be back to
Signal is applied separately to be supplied to wavelength-division multiplex after MZ Mach-Zehnder 1031 and 1032 pair optical signal carries out intensity modulated
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 for amplify compensated optical signal by optical fiber link transmission in because dispersion etc. because
Power loss caused by element；
The modulated optical signal that the photodetector 1071 is used to be back to central station carries out photoelectric conversion, and is supplied to
Bandpass filter 1081；
For the bandpass filter 1081 for being filtered to the microwave signal received, filter center frequency is micro-
The frequency of wave signal 1011；
The laser source 1022 is λ for generation wavelength2Optical 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: wavelength division multiplexer 2011, photodetector 2021, bandpass filter 2031, electrically amplified
Device 2041, power splitter 20/51, frequency tripler 2101, laser source 2061, MZ Mach-Zehnder 2071, photodetector
2022, bandpass filter 2032, electric amplifier 2042, fundamental frequency signal component source 2091, frequency mixer 2081, bandpass filter
2033, frequency mixer 2082, bandpass filter 2034, frequency mixer 2083, bandpass filter 2035, two-divider 2111, in which:
The wavelength division multiplexer 2011 is used for the different wave length of laser source 1021, laser source 1022 and laser source 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 issue central station carries out photoelectric conversion, and is supplied to band
Bandpass filter 2031；
For the bandpass filter 2031 for being filtered to the microwave signal received, filter center frequency is micro-
The frequency of wave 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, and another way is logical
Central station, which is back to, after crossing in the system to laser source 2061 of MZ Mach-Zehnder tune 2071 carries out 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 is mixed with through the filtered microwave signal of bandpass filter 2033；
The laser source 2061 is back to wavelength needed for central station for generating as λ1Optical signal；
The photodetector 2022 is used to received optical signal carrying out photoelectric conversion, and is supplied to bandpass filter
2032；
The microwave signal that the bandpass filter 2032 is used to export photodetector 2022 is filtered, filter center
Frequency is the frequency of microwave signal；
The electric amplifier 2042 is used to carry out power amplification to filtered electric signal；
Fundamental frequency signal component source 2091 is for generating the fundamental frequency signal component being mixed；
The frequency mixer 2081 is used to produce microwave signal that electric amplifier 2042 exports and fundamental frequency signal component source 2091
Raw fundamental frequency signal component is mixed；
The microwave signal that the bandpass filter 2033 is used to export frequency mixer 2081 is filtered, filter center frequency
For microwave signal 1011 and fundamental frequency signal component 2091 and frequency；
What the frequency mixer 2082 was used to generate microwave signal and frequency tripler 2101 that bandpass filter 2033 exports
Frequency tripling signal component is mixed；
The microwave signal that the bandpass filter 2034 is used to export frequency mixer 2082 is filtered, filter center frequency
The difference frequency of microwave signal is exported for frequency tripling signal component 2101 and bandpass filter 2033；
The microwave signal and fundamental frequency signal component source 2091 that the frequency mixer 2083 is used to export bandpass filter 2034
The fundamental frequency signal component of generation is mixed；
The microwave signal that the bandpass filter 2035 is used to export frequency mixer 2083 is filtered, filter center frequency
Export microwave signal and fundamental frequency signal component 2091 for bandpass filter 2034 and frequency；
The microwave signal that the two-divider 2111 is used to export bandpass filter 2035 carries out two divided-frequency, 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 solution, its principle is further described below:
Assuming that target microwave signal to be transmitted is (ignoring amplitude):
Wherein ω0WithRespectively indicate the angular frequency and initial phase of target microwave signal, ωrefWithRespectively indicate base
The angular frequency and initial phase of frequency signal component, cos () indicate that cosine function, t indicate the time.
After MZ Mach-Zehnder is modulated on light, distant-end node is transferred to by single mode optical fiber:
WhereinFor the phase perturbation of optical 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
It is transferred to distant-end node again:
Traditional passive method for correcting phase is expressed as being mixed after (3) formula to be carried out to frequency tripling with (4) formula, obtains:
After two-divider frequency dividing and bandpass filter are filtered, target microwave signal, but this can be reverted to
When filtered signal in there are still the local oscillator leakage generated by microwave signal itself beat frequency, cause phase perturbation complete
It eliminates.(2) formula and (4) formula be mixed and be filtered itself and frequency signal by the method first, obtain:
(6) formula is mixed with the frequency tripling signal component of (3) formula and its difference frequency signal is filtered, is obtained
It arrives:
(7) formula is mixed with (2) formula and itself and frequency signal are filtered, is obtained:
Two divided-frequency is carried out to (8) formula, is obtained:
It is filtered through bandpass filter, finally obtains the target microwave signal of phase stabilization.
In summary it states, the present invention has following feature.1) the present invention only needs for optical fiber to be transmitted to behind distal end and another
Local oscillation signal of the road Jing Guo round-trip transmission is mixed, and can be eliminated the phase introduced after microwave signal is transmitted in light and be disturbed
It is dynamic, it does not need to extract phase jitter information by complicated circuit design to reduce the complexity of system to compensate, and
And phasing required time is the time of optical fiber link round-trip transmission, and fast phase correction may be implemented.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 filtering processing of the mixing of amount and corresponding centre frequency avoids the microwave signal generated when conventional method mixing by beat frequency
Local oscillator leakage, to eliminate caused phase perturbation in optical fiber link.
Set forth above is only the preferred embodiment of the present invention, it is noted that do not depart from the method for the present invention and
Under the premise of core apparatus essence, several changes can be made in actual implementation and polishing should also be included in protection of the invention
Within range.
Claims (2)
1. 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 list
Mode fiber connects central station and distant-end node, and target microwave signal is loaded on optical signal by central station by electro-optical modulation, to
Distant-end node transmission；In distant-end node, it will be divided after the progress photodetection of received microwave signal and bandpass filtering with the first function
Device is divided into two-way, carries out frequency tripling all the way, and another way is back to central station；In central station, the optical signal received is subjected to light
It is modulated on the light source of third different wave length after electricity conversion, distant-end node is sent to by the first wavelength division multiplexer again and is carried out
The microwave signal of photodetection and bandpass filtering, output is first mixed with fundamental frequency signal component, is believed by filtered and frequency
It number is mixed with frequency tripling signal component, the difference frequency signal after bandpass filtering is mixed with fundamental frequency signal component again, defeated
Being divided with frequency signal by two-divider after filtering processing of microwave signal out, the target for obtaining phase stabilization is micro-
Wave signal；In central station, first laser source generation wavelength is λ0Optical signal, target microwave signal is applied to first Mach
Zeng Deer modulator is supplied to the first wavelength division multiplexer after carrying out intensity modulated to optical signal；First wavelength division multiplexer is by
The intensitymodulated optical signals of one MZ Mach-Zehnder output and the microwave signal transmission of central station is back to first ring of light
Row device；Third laser source generation wavelength is λ2Optical signal, the microwave signal of passback passes through the first image intensifer and the second photoelectricity
It is applied to after third MZ Mach-Zehnder carries out intensity modulated to optical signal and provides after detector and the second bandpass filter
To the first wavelength division multiplexer；Distant-end node includes: that the second wavelength division multiplexer is used to the optical signal of three different wave lengths being divided into three
A channel and by the modulated optical signal of distant-end node in λ1Channel passes through fiber pass-back to central station；First photodetector will in
The modulated optical signal that center station issues carries out photoelectric conversion, and is supplied to the first bandpass filter；The docking of first bandpass filter is received
Microwave signal be filtered；Filtered microwave signal is divided into two-way by the first power splitter, carries out frequency tripling all the way, separately
It is back to central station after being modulated on second laser source by the second MZ Mach-Zehnder all the way and carries out round-trip transmission；Three times
The microwave signal that frequency device exports the first power splitter carries out frequency tripling, the microwave signal of signal component and round-trip transmission after frequency multiplication
It is mixed；It is λ that second laser source, which generates and is back to wavelength needed for central station,1Optical signal；Third photodetector will receive
Optical signal carry out photoelectric conversion, and be supplied to third bandpass filter, filter center frequency is the frequency of target microwave signal；
It is amplified by the second electric amplifier and is mixed with fundamental frequency signal component by the first frequency mixer after handling；By the letter of mixing
Number by the 4th bandpass filter, filter center frequency is mixed frequency signal and frequent rate；Filtered and frequency signal and three
Frequency-doubled signal component is mixed by the second frequency mixer；The signal of mixing is passed through into the 5th bandpass filter, filter center frequency
Rate is the beat frequency of mixed frequency signal；Filtered difference frequency signal and identical fundamental frequency signal component by third frequency mixer into
Row mixing；By the signal of mixing by the 6th bandpass filter, filter center frequency is mixed frequency signal and frequent rate；Through filtering
Being divided with frequency signal by two-divider for wave, finally obtains 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,
It is characterized in that, in central station, there are two the laser sources of different wave length, are modulated to microwave signal after the long multiplexing of Different lightwave through same
The transmission of piece optical fiber, and carried out before and after the second frequency mixer and the mixing of fundamental frequency signal component and corresponding centre frequency
Filtering processing.
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| CN108398691B (en) * | 2018-05-25 | 2023-10-17 | 中国工程物理研究院流体物理研究所 | Difference frequency signal generating device and method |
| CN110995358B (en) * | 2019-12-13 | 2021-04-06 | 南京航空航天大学 | Microwave phase shifting method and device and high-stability photo-generated microwave source |
| CN111431622B (en) * | 2020-03-20 | 2022-09-20 | 大连理工大学 | Photoelectric fusion continuous wave radar leakage interference elimination device and method |
| CN112367120B (en) * | 2020-10-23 | 2023-06-02 | 西北工业大学 | Microwave local vibration source double frequency optical fiber stable phase transmission system |
| CN114326924B (en) * | 2022-03-03 | 2022-06-17 | 阿里巴巴达摩院(杭州)科技有限公司 | Signal processing method and storage medium |
| CN116366161B (en) * | 2023-02-03 | 2023-11-10 | 华北电力大学（保定） | Optical fiber ring network radio frequency signal stable transmission system |
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| CN106656335A (en) * | 2016-09-28 | 2017-05-10 | 西安电子科技大学 | Microwave signal photonic frequency conversion and multichannel fiber transmission device and method |
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| CN103501199B (en) * | 2013-09-30 | 2016-05-18 | 中国人民解放军理工大学 | Phase place regulation device and method that radiofrequency signal stabilized fiber transmits mutually |
| CN104618024B (en) * | 2015-01-04 | 2017-01-11 | 西南交通大学 | Anonymous microwave signal long-distance optical fiber phase-stable transmission device eliminating coherent Rayleigh noise |
| CN106301576B (en) * | 2016-08-05 | 2018-12-25 | 西南交通大学 | A kind of steady phase transmission method of multi-frequency multiple spot microwave optical fiber based on passive phase correction |
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