CN104202090B - The microwave signal long-distance optical fiber steady phase transmitting device of optically-based phase conjugation - Google Patents
The microwave signal long-distance optical fiber steady phase transmitting device of optically-based phase conjugation Download PDFInfo
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Abstract
A kind of microwave signal long-distance optical fiber steady phase transmitting device of optically-based phase conjugation, including: a transmitting terminal, a receiving terminal and a single-mode fiber, described transmitting terminal is connected with receiving terminal by single-mode fiber, and signal is only processed by the present invention at transmitting terminal, builds and maintenance cost is low；Decrease the use of frequency mixer, the predistortion of microwave signal is mainly carried out on light, improves the bandwidth of system；Only use a microwave source, it is not necessary to synchronize.
Description
Technical field
The present invention relates to a kind of system being transmitted microwave signal by stabilized fiber mutually, a kind of specifically
The microwave signal long-distance optical fiber steady phase transmitting device of optically-based phase conjugation, belongs to Microwave photonics
Technical field.
Background technology
At distributed SAR system, survey of deep space, atomic clock distribution, GLONASS
Deng in field, it is required to use the steady phase transmission technology of microwave signal.Traditional microwave signal transmission is adopted
Carry out surely transmitting mutually with coaxial cable, but cable loss is big, volume is big, cost is high, be difficulty with remote
Distance Transmission.Optical fiber is with its low-loss, be considered with roomy, electromagnetism interference, advantage that price is low
It is highly suitable for the transmission of microwave signal, especially long-distance transmissions.But, due to external environment
Impact, as temperature, strain, vibration etc., the equivalent length of optical fiber can be caused to change, through light
The signal lag of fine transmission changes, and then causes the phase place of the microwave signal through fiber-optic transfer to occur
Shake.At present, it is achieved the basic thought that microwave signal is transmitted mutually is all to utilize round-trip delay correction to disappear
Except phase jitter, it is believed that the optical signal transmitted the most in opposite directions is separate, prolonging of its experience
Time be identical, i.e. phase jitter is identical, and concrete grammar can be summarized as two classes, and one is actively control
Method, the microwave signal reality of round-trip transmission in optical fiber link being modulated on light carrier by extracting directly
Shi Xiangwei wobble information, it is thus achieved that phase signal, utilizes and controls device Active Compensation microwave to be transmitted letter
Number phase place so that transmission microwave signal tend towards stability, the limitation of this method is, phase place
The extraction of difference signal relies primarily on the Phase Lock Technique on circuit, i.e. utilizes phase discriminator and loop filter mirror
Other phase jitter information, the bandwidth of transmission signal is very limited, it addition, be currently used for compensating phase
The device of position mainly has a wavelength-tuned laser, tunable optical/electric delay line, fiber stretcher etc., when
When environmental change is bigger, optical fiber equivalent length changes greatly, thus causes the phase jitter of transmission signal
Relatively big, owing to the adjustable extent of above-mentioned device is less, it is difficulty with the real-Time Compensation of phase jitter.
The present invention uses passive control methods, at signal transmitting terminal, by with the signal of phase jitter and to be passed
Defeated signal carries out mixing and realizes signal predistortion, and the signal of predistortion is after the transmission of same link
Obtain the microwave signal of phase stabilization.At present, passive control methods typically requires multiple frequency mixer, electrofiltration
Ripple device and multiple phase locked microwave source, system complex, relatively costly.(F.Yin,A.Zhang,
Y.Dai,T.Ren,K.Xu,J.Li,J.Lin,and G.
Tang,“Phase-conjugation-based fast RF phase tabilization for fiber
delivery”Opt.Express vol.22,no.1,2014.)
Summary of the invention
It is an object of the invention to, it is provided that the microwave signal distance light of a kind of optically-based phase conjugation
Fine steady phase transmitting device, signal is only processed at transmitting terminal, builds and maintenance cost is low by this device；
Decrease the use of frequency mixer, the predistortion of microwave signal is mainly carried out on light, improves system
Bandwidth；Only use a microwave source, it is not necessary to synchronize.
The present invention provides the microwave signal long-distance optical fiber of a kind of optically-based phase conjugation to transmit mutually
Device, including: a transmitting terminal, a receiving terminal and a single-mode fiber, described transmitting terminal passes through single-mode optics
Fibre is connected with receiving terminal, wherein:
Described transmitting terminal includes:
One microwave signal source；
One frequency eliminator, its input is connected with the outfan of microwave signal source；
One first phase conjugate unit, its input is connected with the outfan of frequency eliminator；
One first photodetector, its input is connected with the outfan of first phase conjugate unit；
One power splitter, the outfan of its input and the first photodetector is connected；
One intensity modulator, its rf inputs is connected with the output port 1 of power splitter；
One light source, its outfan is connected with the light input end of intensity modulator；
One optical circulator, its input port 1 is connected with the outfan of intensity modulator；
One first array waveguide grating, its input port 2 is connected with the output port 2 of circulator；
One second photodetector, its input is connected with the port 3 of optical circulator；
One electricity frequency mixer, the outfan of its local oscillator input and the second photodetector is connected, and this electricity mixes
Frequently the IF input terminal of device is connected with the output port 2 of power splitter；
One band filter, its input is connected with the RF output end of electricity frequency mixer；
One second phase conjugate unit, its input is connected with the outfan of band filter, outfan
It is connected with the first array waveguide grating input port 1；
Described receiving terminal includes:
One second array waveguide grating, its input is connected with single-mode fiber, another of this single-mode fiber
End is connected with the outfan of the first array waveguide grating；
One Faraday mirror, the output port 2 of its input and the second array waveguide grating is connected；
One the 3rd photodetector, the output port 1 of its input and the second array waveguide grating is connected.
The method have the advantages that signal is only processed at transmitting terminal by this system, build
And maintenance cost is low；Decrease the use of frequency mixer, mainly enterprising at light to the predistortion of microwave signal
OK, improve the bandwidth of system；Only use a microwave source, it is not necessary to synchronize.
Accompanying drawing explanation
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with concrete real
Execute example, and referring to the drawings, the present invention is described in further detail, wherein:
Fig. 1 is that the microwave signal long-distance optical fiber of optically-based phase conjugation in the present invention transmits dress mutually
The structural representation put；
Fig. 2 is the structural representation of optical phase conjugation unit in the present invention.
Detailed description of the invention
Referring to shown in Fig. 1, the microwave signal that the invention provides a kind of optically-based phase conjugation is long
The structural representation of distance stabilized fiber phase transmitting device, this system includes: a transmitting terminal A, a reception
End B and a single-mode fiber 10, described transmitting terminal A is connected with receiving terminal B by single-mode fiber 10,
Wherein:
Described transmitting terminal A includes:
One microwave signal source 1, described microwave signal source 1 is vector network analyzer or microwave signal source,
It is used for producing local oscillator microwave signal, and this signal is the signal needing transmission；
One frequency eliminator 2, its input is connected with the outfan of microwave signal source 1, for by described
The frequency of microwave signal of shaking and initial phase become original half；
One first phase conjugate unit 3, its input is connected with the outfan of frequency eliminator 2, and being used for will
Described frequency elimination signal is modulated on light carrier, and utilizes the four-wave mixing effect of image intensifer that this is removed
Frequently the phase place of signal becomes contrary, and frequency is constant, and filter out optical carrier lower sideband and
Modulation sideband, more than+2 rank sidebands, it is achieved single sideband modulation；
One first photodetector 4, its input is connected with the outfan of first phase conjugate unit 3,
It is for by the optical carrier of described single sideband modulation and+1 contrast sideband signals beat frequency, being converted into
The signal of telecommunication, the microwave signal obtained and described frequency elimination signal are phase conjugation signal；
One power splitter 5, the outfan of its input and the first photodetector 4 is connected, and described merit is divided
The power of device 5 ratio is for 50:50, for the microwave signal of described phase conjugation is divided into two-way；
One intensity modulator 6, its rf inputs is connected, wherein with the output port 1 of power splitter 5
The material of described intensity modulator 6 is lithium columbate crystal, semi-conducting polymer or organic polymer,
For light carrier is modulated on a road of described phase conjugation signal, to carry out fiber-optic transfer；
One light source 7, its outfan is connected with the light input end of intensity modulator 6, is used for producing continuously
Light carrier；
One optical circulator 8, its input port 1 is connected with the outfan of intensity modulator 6, and it has
Nonreciprocity, light can only unidirectional go in ring wherein, the light after the described intensity modulated of 1 port input
Carrier wave exports 2 ports, is transferred to receiving terminal, returns to this light after Faraday mirror 12 reflection
The port 2 of circulator, and export output port 3, the phase conjugation signal of return experienced by twice
Phase perturbation；
One first array waveguide grating 9, its input port 2 is connected with the output port 2 of circulator 8,
It has the function of wavelength-division multiplex；
One second photodetector 13, its input is connected with 3 ports of optical circulator 8, and it is used for
By optical carrier and+1 contrast of the described single sideband modulation transmitting and being reflected back through single-mode fiber 10
Sideband signals processed carries out beat frequency, converts optical signal into microwave signal；
Wherein said first photodetector 4 and the second photodetector 13 are photodiode or light
Electricity multiplier tube；
One electricity frequency mixer 14, the outfan of its local oscillator input and the second photodetector 13 is connected,
IF input terminal is connected with the output port 2 of power splitter 5, and it is for by described first photodetector
The frequency elimination phase conjugation signal of 4 outputs and twice optical fiber of experience of the second photodetector 13 output pass
Defeated signal carries out uppermixing, obtains the microwave signal identical with microwave signal source 1 output signal frequency；
One band filter 15, its input is connected with the RF output end of electricity frequency mixer 14, and it is made
With being only by the microwave signal identical with described microwave signal source 1 output signal frequency, other frequencies
Signal all will be filtered out；
One second phase conjugate unit 16, its input is connected with the outfan of band filter 15,
Outfan and the first array waveguide grating 9 input port 1 are connected, and it is for by described band filter
The microwave signal of 15 outputs is modulated on light carrier, and utilizes the four-wave mixing effect of image intensifer to make
The phase place of microwave signal becomes contrary, and frequency is constant, and filter out the lower sideband of optical carrier with
And the modulation sideband, that+2 is more than rank sideband, it is achieved single sideband modulation；
Described first phase conjugate unit 3 and second phase conjugate unit 16 include respectively:
One MZ Mach-Zehnder 20, its rf inputs is the input of phase conjugation unit, institute
Stating MZ Mach-Zehnder 20 is lithium columbate crystal, and it swashs for microwave signal is modulated to first
On the light carrier that light device 21 provides, produce sideband；
One first laser instrument 21, its outfan is connected with the light input end of MZ Mach-Zehnder 20,
For providing light carrier；
One second laser 22, is used for providing light carrier；
Wherein said first laser instrument 21 is different from the centre wavelength of second laser 22.
One bonder 23, its input port 1 is connected with the outfan of MZ Mach-Zehnder 20,
Input port 2 is connected with the outfan of second laser 22, for by the coupling input of two-way light carrier
In semiconductor optical amplifier；
Semiconductor image intensifer 24, its input is connected with the outfan of bonder 23, as above institute
State the light carrier being loaded with microwave signal, with another road light carrier, four ripples occur in semiconductor optical amplifier
Mixing effect, the light carrier without microwave signal is also by the upper microwave signal of modulation, and frequency is constant, phase place
Become anti-；
One optical filter 25, its input is connected with the outfan of image intensifer 24, and its outfan is
The outfan of phase conjugation unit, the signal outside filtering light carrier and single order sideband, leave behind
Light carrier and single order sideband.
Described receiving terminal B includes:
One second array waveguide grating 11, its input is connected with single-mode fiber 10, and it can be used for solving
Wavelength-division multiplex, the light of the different wave length i.e. transmitted by single-mode fiber 10 can be exported from different port；
One Faraday mirror 12, output port 2 phase of input and the second array waveguide grating 11
Even, it is for returning the signaling reflex transmitted from transmitting terminal A to transmitting terminal A；
One the 3rd photodetector 17, its input and the output port of the second array waveguide grating 11
1 is connected, for the microwave signal without phase jitter being mounted on light carrier transmission is converted to telecommunications
Number, the signal frequency phase place that this signal exports with described microwave signal source 1 is the most identical；
Described fiber transmission link includes single-mode fiber 10, its input and the first array waveguide grating
The outfan of 9 is connected, and the input of outfan and the second array waveguide grating 11 is connected, and is used for transmitting
Light load microwave signal, a length of 10 kilometers.
Assume that the microwave local oscillation signal that transmitting terminal A microwave signal source 1 exports isWherein
ωRFFor angular frequency,For initial phase, the frequency elimination signal obtained after frequency eliminator 2 isIts phase place is negated by first phase conjugate unit 3, and the signal of output isThis frequency elimination phase conjugation signal is modulated on light carrier, carries out through single-mode fiber
Transmission, and reflect, experienced by the phase jitter of twice, i.e. time delay is 2 τ, the microwave after return
Signal can be expressed asFrequency elimination signal and transmission without transmission
After frequency elimination signal carry out, through electricity frequency mixer 14, the microwave signal that uppermixing obtains and beThis signal is carried out phase conjugation by second phase conjugate unit, the letter obtained
Number beThis signal, through transmission, experiences the time jitter of a times, is receiving
The signal that end B the 3rd photodetector is received isThe microwave letter launched with transmitting terminal A
Number initial phase is identical, it is achieved microwave signal is transmitted mutually.
Particular embodiments described above, is carried out the purpose of the present invention, technical scheme and beneficial effect
Further describe it should be understood that the foregoing is only the specific embodiment of the present invention,
Be not limited to the present invention, all within the spirit and principles in the present invention, any amendment of being made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (8)
1. a microwave signal long-distance optical fiber steady phase transmitting device for optically-based phase conjugation, bag
Including: a transmitting terminal, a receiving terminal and a single-mode fiber, described transmitting terminal passes through single-mode fiber and reception
End connects, wherein:
Described transmitting terminal includes:
One microwave signal source；
One frequency eliminator, its input is connected with the outfan of microwave signal source；
One first phase conjugate unit, its input is connected with the outfan of frequency eliminator；
One first photodetector, its input is connected with the outfan of first phase conjugate unit；
One power splitter, the outfan of its input and the first photodetector is connected；
One intensity modulator, its rf inputs is connected with the output port 1 of power splitter；
One light source, its outfan is connected with the light input end of intensity modulator；
One optical circulator, its input port 1 is connected with the outfan of intensity modulator；
One first array waveguide grating, its input port 2 is connected with the output port 2 of circulator；
One second photodetector, its input is connected with the port 3 of optical circulator；
One electricity frequency mixer, the outfan of its local oscillator input and the second photodetector is connected, and this electricity mixes
Frequently the IF input terminal of device is connected with the output port 2 of power splitter；
One band filter, its input is connected with the RF output end of electricity frequency mixer；
One second phase conjugate unit, its input is connected with the outfan of band filter, outfan
It is connected with the first array waveguide grating input port 1；
Described receiving terminal includes:
One second array waveguide grating, its input is connected with single-mode fiber, another of this single-mode fiber
End is connected with the outfan of the first array waveguide grating；
One Faraday mirror, the output port 2 of its input and the second array waveguide grating is connected；
One the 3rd photodetector, the output port 1 of its input and the second array waveguide grating is connected.
The microwave signal long-distance optical fiber of optically-based phase conjugation the most according to claim 1 is steady
Phase transmitting device, wherein said first phase conjugate unit and second phase conjugate unit include respectively:
One MZ Mach-Zehnder, its rf inputs is the input of phase conjugation unit；
One first laser instrument, its outfan is connected with the light input end of MZ Mach-Zehnder；
One second laser；
One bonder, its input port 1 is connected with the outfan of MZ Mach-Zehnder, input
Mouth 2 is connected with the outfan of second laser；
Semiconductor image intensifer, its input is connected with the outfan of bonder；
One optical filter, its input is connected with the outfan of semiconductor optical amplifier, and its outfan is
The outfan of phase conjugation unit.
The microwave signal long-distance optical fiber of optically-based phase conjugation the most according to claim 2 is steady
Phase transmitting device, wherein said MZ Mach-Zehnder is lithium columbate crystal.
The microwave signal long-distance optical fiber of optically-based phase conjugation the most according to claim 2 is steady
Phase transmitting device, wherein said first laser instrument is different from the centre wavelength of second laser.
The microwave signal long-distance optical fiber of optically-based phase conjugation the most according to claim 2 is steady
Phase transmitting device, wherein said optical filter is waveform shaper based on Liquide Crystal On Silicon, light filter
Ripple device, wavelength division multiplexer or fiber grating.
The microwave signal long-distance optical fiber of optically-based phase conjugation the most according to claim 1 is steady
Phase transmitting device, wherein said first photodetector and the second photodetector be photodiode or
Photomultiplier tube.
The microwave signal long-distance optical fiber of optically-based phase conjugation the most according to claim 1 is steady
Phase transmitting device, the power ratio of wherein said power splitter is 50: 50.
The microwave signal long-distance optical fiber of optically-based phase conjugation the most according to claim 1 is steady
Phase transmitting device, the material of wherein said intensity modulator is lithium columbate crystal, semi-conducting polymer
Or organic polymer.
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| US9793996B2 (en) * | 2015-09-14 | 2017-10-17 | Futurewei Technologies, Inc. | Sub-nyquist sampling for bandwidth- and hardware-efficient mobile fronthaul with MIMO processing |
| CN106597362B (en) * | 2016-11-28 | 2019-11-08 | 北京无线电测量研究所 | A kind of signal phase synchronizing device and method for radar base station |
| CN107317629B (en) * | 2017-06-29 | 2019-11-05 | 电子科技大学 | A kind of double wave Transmission system based on recessiveness conjugation |
| CN107425915B (en) * | 2017-08-03 | 2019-08-30 | 上海交通大学 | Active optical fiber microwave frequency transmission system in high precision |
| CN109104247B (en) * | 2018-09-17 | 2019-12-20 | 中国电子科技集团公司第三十八研究所 | Broadband signal phase-stabilizing transmission system based on microwave photon link |
| CN110186501B (en) * | 2018-12-25 | 2021-06-15 | 中国船舶重工集团公司第七一五研究所 | Unbalanced optical fiber interferometer arm length difference measuring device and method adopting comparison method |
| CN111082873B (en) * | 2019-12-17 | 2022-02-11 | 北京邮电大学 | Ultra-long-distance optical fiber high-precision radio frequency signal transmission system and method |
| CN112332911B (en) * | 2020-11-09 | 2022-01-18 | 南京航空航天大学 | Microwave phase discrimination device and phase locking device based on microwave photon technology |
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