CN103716089A - RF signal optical fiber phase-stabilized transmission method and system - Google Patents
RF signal optical fiber phase-stabilized transmission method and system Download PDFInfo
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- CN103716089A CN103716089A CN201310728277.1A CN201310728277A CN103716089A CN 103716089 A CN103716089 A CN 103716089A CN 201310728277 A CN201310728277 A CN 201310728277A CN 103716089 A CN103716089 A CN 103716089A
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Abstract
The invention discloses an RF signal optical fiber phase-stabilized transmission method. The method specifically includes the steps that a sending end carries out light modulation on RF signals needing to be transmitted, and then transmits the RF signals to a receiving end through an optical fiber; the receiving end carries out light modulation on local oscillator signals and transmits the local oscillator signals to the sending end through the optical fiber, and the sending end sends received light modulation signals of the local oscillator signals back to the receiving end through the optical fiber, wherein the frequency of the local oscillator signals is half that of the RF signals needing to be transmitted; the receiving end carries out modulation on light signals input in the optical fiber to obtain mixed RF signals, and then extracts first signals and second signals from the mixed RF signals respectively, wherein the frequency of the first signals is equal to that of the RF signals needing to be transmitted, and the frequency of the second signals is equal to that of the local oscillator signals; up-conversion is carried out on the first signals and the local oscillator signals, and then down-conversion is carried out on the obtained signals and the second signals to finally obtain the transmission RF signals transmitted in a phase-stabilized mode. The invention further discloses an RF signal optical fiber phase-stabilized transmission system. Quality of phase-stabilized transmission of the signals is high and the RF signal optical fiber phase-stabilized transmission system is simple in structure.
Description
Technical field
The present invention relates to a kind of radiofrequency signal stabilized fiber phase transmission method and system, relate in particular to a kind of radiofrequency signal stabilized fiber phase transmission method and system based on mixing null method, belong to Microwave photonics technical field.
Background technology
Steady phase transmission technology radio astronomy, distributed SAR system, the distribution of high accuracy standard time clock, particle accelerator and utilize carrier phase to position and the fields such as Global Navigation Satellite System (GNSS) one machine multi-aerial receiver of navigating in have important application.Traditionally, adopt cable to carry out the transmission of radiofrequency signal, due to shortcomings such as its loss are large, expensive, volume is large, be difficult to use in the long transmission apart from radiofrequency signal.Optical fiber has low, the anti-electromagnetic interference of loss, price is low and be with the advantages such as roomy, the transmission of very applicable radiofrequency signal, the signal transmission of especially long distance.Yet, due to the variation of the variation of optical fiber environment of living in, particularly temperature, will causing the variation of optical fiber equivalent length, the time delay of the signal transmitting in optical fiber experience is shake thereupon also, causes the radiofrequency signal phase-unstable finally receiving.At present, realize the method that high-quality radiofrequency signal stabilized fiber transmits mutually and mainly contain following two classes: (1) penalty method, from the signal of round-trip transmission optical link, extract the real-time wobble information of optical link transmission delay, and control accordingly the transmission delay shake of related device compensating signal in optical fiber, thereby the radiofrequency signal phase place of transmission is tended towards stability.Current report for realizing the device of optical link transmission delay jitter compensation, have tunable optical/electric delay line, fiber stretcher, adjustable wavelength laser, temperature control roll of optical fiber and electrooptic modulator.The limitation of this method is, when environment (being mainly temperature) has larger variation, the equivalent length of optical link makes transmission delay shake larger by producing larger variation, and is limited for realizing the adjustable extent of the device of optical link transmission delay jitter compensation.(2) mixing null method, that is utilize and within very short a period of time, (to think that inner fiber equivalent length is substantially constant during this period of time) in same section of optical fiber the transmission delay of the radiofrequency signal experience of round-trip transmission is identical, by two-way is carried out to mixing with the signal of identical traffic phase delay, make to transmit phase delay shake and offset; Or by making signal predistortion waiting for transmission by carrying out mixing with the transmission signal of phase delay and signal waiting for transmission, after transmitting by same link, the radiofrequency signal of phase stabilization will be obtained under meeting some requirements.Compare, based on mixing null method, realize radiofrequency signal stabilized fiber and transmit mutually the restriction that there is no delay adjusting scope, and do not need complicated transmission delay wobble information extract real-time circuit and corresponding compensation drive circuit.The steady phase transmission technology based on mixing method of current report is utilized multistage (more than 3 grades) mixing, need a plurality of frequency mixers, electric amplifier, electrical filter and a plurality of phase locked microwave source, system complicated operation and to realize cost high, the more important thing is, this system is output as intermediate-freuqncy signal, original radio frequency signal (the Z. Wu that not transmitting terminal receives, Y. Dai, F. Yin, K. Xu, J. Li, and J. Lin, " Stable radio frequency phase delivery by rapid and endless post error cancellation, "
opt. Lett., vol. 38, and no. 7, pp. 1098-1100,2013.).
Summary of the invention
Technical problem to be solved by this invention is to overcome prior art deficiency, and a kind of radiofrequency signal stabilized fiber phase transmission method and system are provided, and can realize in the mode of simple economy the surely transmission mutually of high-quality radiofrequency signal.
The present invention is specifically by the following technical solutions:
A radiofrequency signal stabilized fiber phase transmission method, transmitting terminal will need transmitting radio frequency signal to carry out passing through optical fiber after light modulation
To receiving terminal, transmit; Receiving terminal is that described half the local oscillation signal of transmitting radio frequency signal frequency that needs carries out by described optical fiber, to transmitting terminal, transmitting after light modulation by frequency, and transmitting terminal is back to receiving terminal by the light modulating signal of the described local oscillation signal receiving by described optical fiber; Receiving terminal carries out demodulation to the light signal of inputting in described optical fiber, obtain hybrid radio frequency signal, then from described hybrid radio frequency signal, extract respectively the first signal identical with needing transmitting radio frequency signal frequency and the secondary signal identical with described local oscillation signal frequency; Finally, first described first signal and described local oscillation signal are carried out to up-conversion, more resulting signal and described secondary signal are carried out to down-conversion afterwards, finally obtain needing transmitting radio frequency signal.
A kind of radiofrequency signal stabilized fiber phase transmission system, comprise the transmitting terminal and the receiving terminal that by optical fiber, connect, described transmitting terminal comprises: the first photoelectricity modulation module, optical isolator, light reflection mirror, three port optical couplers, the light output end of the first photoelectricity modulation module is connected with the straight-through direction input port of optical isolator, and three ports of three port optical couplers are connected with the straight-through direction delivery outlet of light reflection mirror, optical isolator, one end of described optical fiber respectively, described receiving terminal comprises: the first～the four-tape bandpass filter, the first frequency mixer, the second frequency mixer, the second photoelectricity modulation module, local oscillation signal source, three ports light rings, photodetector, power splitter, first of three port circulators～three port respectively with the light output end of the second photoelectricity modulation module, the other end of described optical fiber, the input of photodetector connects, the output of photodetector is connected with the input of power splitter, two outputs of power splitter respectively with the input of the first band pass filter, the input of the second band pass filter connects, two inputs of the first frequency mixer respectively with the output of the first band pass filter, local oscillation signal source connects, the output of the first frequency mixer is connected with an input of the second frequency mixer by the 3rd band pass filter, another input of the second frequency mixer, output respectively with the output of the second band pass filter, the input of four-tape bandpass filter connects, the microwave signal input of the second photoelectricity modulation module is connected with local oscillation signal source, the signal frequency that described local oscillation signal source produces is to need half of transmitting radio frequency signal frequency, the passband central frequency of described the first band pass filter and four-tape bandpass filter with need transmitting radio frequency signal frequency identical, the passband central frequency of described the second band pass filter is to need half of transmitting radio frequency signal frequency, and described the 3rd band pass filter passband central frequency is to need 1.5 times of transmitting radio frequency signal frequency.
A kind of radiofrequency signal stabilized fiber phase transmission system, comprise the transmitting terminal and the receiving terminal that by optical fiber, connect, described transmitting terminal comprises: the first photoelectricity modulation module, optical isolator, the one or three ports light rings, image intensifer, three port optical couplers, the light output end of the first photoelectricity modulation module is connected with the straight-through direction input port of optical isolator, three ports of three port optical couplers respectively with the second port of the one or three ports light rings, the straight-through direction delivery outlet of optical isolator, one end of described optical fiber connects, the 3rd port of the one or three ports light rings is connected with the input of image intensifer, the output of image intensifer is connected with the first port of the one or three ports light rings, described receiving terminal comprises: the first～the four-tape bandpass filter, the first frequency mixer, the second frequency mixer, the second photoelectricity modulation module, local oscillation signal source, the two or three ports light rings, photodetector, power splitter, first of the two or three port circulator～three port respectively with the light output end of the second photoelectricity modulation module, the other end of described optical fiber, the input of photodetector connects, the output of photodetector is connected with the input of power splitter, two outputs of power splitter respectively with the input of the first band pass filter, the input of the second band pass filter connects, two inputs of the first frequency mixer respectively with the output of the first band pass filter, local oscillation signal source connects, the output of the first frequency mixer is connected with an input of the second frequency mixer by the 3rd band pass filter, another input of the second frequency mixer, output respectively with the output of the second band pass filter, the input of four-tape bandpass filter connects, the microwave signal input of the second photoelectricity modulation module is connected with local oscillation signal source, the signal frequency that described local oscillation signal source produces is to need half of transmitting radio frequency signal frequency, the passband central frequency of described the first band pass filter and four-tape bandpass filter with need transmitting radio frequency signal frequency identical, the passband central frequency of described the second band pass filter is to need half of transmitting radio frequency signal frequency, and described the 3rd band pass filter passband central frequency is to need 1.5 times of transmitting radio frequency signal frequency.
Preferably, described power splitter is the power splitter of 50 ︰ 50.
Preferably, described the first～the four-tape bandpass filter is narrow band filter.
Preferably, the electrooptic modulator in the first photoelectricity modulation module, the second photoelectricity modulation module is MZ Mach-Zehnder.
Compared to existing technology, the present invention has following beneficial effect:
1, the present invention only needs the local oscillation signal of the signal of Optical Fiber Transmission and local oscillation signal and process same link round-trip transmission successively to carry out mixing, can eliminate radiofrequency signal and in optical fiber, transmit the rear phase jitter of introducing, not need complicated transmission delay shake real time information extraction module and corresponding transmission delay jitter compensation module.
2, the present invention only needs a local oscillation signal source to produce local oscillation signal, and signal only can be realized radiofrequency signal stabilized fiber by twice mixing and transmit mutually after transmission, and low, simple for structure, the steady phase effect of system loss is remarkable.
Accompanying drawing explanation
Fig. 1 is the structural representation of a specific embodiment of radiofrequency signal stabilized fiber phase transmission system of the present invention;
Fig. 2 is the structural representation of a specific embodiment of radiofrequency signal stabilized fiber phase transmission system of the present invention;
Fig. 3, for be transferred to the eye pattern of 6 GHz radiofrequency signals of receiving terminal from transmitting terminal, wherein, is (a) not through the steady eye pattern of the signal (being the output of band pass filter 1) of processing mutually of the present invention; (b) be the eye pattern of the signal (being the output of band pass filter 4) after processing mutually by the present invention is steady;
Fig. 4 is for being transferred to the time jitter root-mean-square value of 6 GHz radiofrequency signals of receiving terminal from transmitting terminal, in figure, solid line is that dotted line is the time jitter root-mean-square value of the signal (being the output of band pass filter 4) after processing by the inventive method not through the time jitter root-mean-square value of the steady signal (being the output of band pass filter 1) of processing mutually of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is elaborated:
Basic ideas of the present invention are: the local oscillation signal transmission delay after round-trip transmission in optical fiber that utilizes receiving terminal to produce is the twice of transmitting terminal institute signal transmission time delay of one-way transmission in optical fiber, and half of the radio frequency signal frequency that local oscillation signal source the produces signal frequency that to be antenna reception arrive, so the phase jitter after these two signal transmission is identical, by mixing, two signal phase shakes are offset, thereby obtain the radiofrequency signal of phase stabilization after Optical Fiber Transmission.Particularly, the method applied in the present invention is: transmitting terminal will need transmitting radio frequency signal to carry out by optical fiber, to receiving terminal, transmitting after light modulation; Receiving terminal is that described half the local oscillation signal of transmitting radio frequency signal frequency that needs carries out by described optical fiber, to transmitting terminal, transmitting after light modulation by frequency, and transmitting terminal is back to receiving terminal by the light modulating signal of the described local oscillation signal receiving by described optical fiber; Receiving terminal carries out demodulation to the light signal of inputting in described optical fiber, obtain hybrid radio frequency signal, then from described hybrid radio frequency signal, extract respectively the first signal identical with needing transmitting radio frequency signal frequency and the secondary signal identical with described local oscillation signal frequency; Finally, first described first signal and described local oscillation signal are carried out to up-conversion, more resulting signal and described secondary signal are carried out to down-conversion afterwards, finally obtain needing transmitting radio frequency signal.
Fig. 1 has shown a specific embodiment of radiofrequency signal stabilized fiber phase transmission system of the present invention.Transmitting terminal as shown in the figure, comprises light source 1, electrooptic modulator 1, optical isolator, antenna (or radiofrequency signal generating apparatus), light reflection mirror, optical coupler; The optical input of electrooptic modulator 1, electric input port, light delivery outlet are connected with the straight-through direction input port of delivery outlet, antenna and the optical isolator of light source 1 respectively, the straight-through direction delivery outlet of optical isolator is connected with the port 3 of optical coupler, the port 2 of optical coupler is connected with speculum, and the port one of optical coupler is connected with optical fiber.Receiving terminal as shown in the figure, comprises local oscillation signal source, light source 2, electrooptic modulator 2, photodetector, optical circulator, power splitter (the preferably power splitter of 50:50), band pass filter 1, band pass filter 2, band pass filter 3, band pass filter 4, frequency mixer 1, frequency mixer 2, the optical input of electrooptic modulator 2, electricity input port, light delivery outlet respectively with the delivery outlet of light source 2, the output in local oscillation signal source is connected with the port one of optical circulator, the port 2 of optical circulator is connected with optical fiber, the light input end of photodetector is connected with the port 3 of optical circulator and the input port 1 of power splitter respectively with electric output, the output port 2 of power splitter is connected with band pass filter 1 input port, two input ports of frequency mixer 1 are connected with the delivery outlet of band pass filter 1 with the output of local oscillation signal source respectively, the input port of band pass filter 3 is connected with the delivery outlet of frequency mixer 1, the input port of band pass filter 2 is connected with the output port of power splitter 3, two input ports of frequency mixer 2 are connected with band pass filter 3 with band pass filter 2 respectively, the delivery outlet of frequency mixer 2 is connected with band pass filter 4.Wherein, the frequency of the microwave signal that send in local oscillation signal source is half of the radio frequency signal frequency that receives of antenna, the radio frequency signal frequency that the passband central frequency of band pass filter 1 and band pass filter 4 receives with antenna is identical, the passband central frequency of band pass filter 2 is half of the radio frequency signal frequency that receives of antenna, and band pass filter 3 passband central frequencies are to need 1.5 times of transmitting radio frequency signal frequency.Band pass filter 1～4 all adopts narrow band filter.
Said system, when work, passes to transmitting terminal from receiving terminal after the signal that local oscillation signal source produces is modulated onto on light carrier, is reflected after mirror reflects and transfers back to again receiving terminal from transmitting terminal, by band pass filter 2, leaches this signal; Simultaneously antenna reception to radiofrequency signal after transmitting terminal is by light modulation, from transmitting terminal, be transferred to receiving terminal, by band pass filter 1, leach this signal, the signal that first this signal produces with local oscillation signal source in frequency mixer 1 carries out mixing (up-conversion), band pass filter 3 leaches the signal after conversion, the output signal of the output signal of band pass filter 3 and band pass filter 2 mixing in frequency mixer 2 (down-conversion), band pass filter 4 leaches the signal after lower conversion, realized antenna reception to signal be surely transferred to mutually receiving terminal.
Suppose antenna reception to radiofrequency signal be
, wherein
,
be respectively angular frequency and phase place, the signal that local oscillation signal source produces is
, wherein
for its initial phase, and hypothesis transmission delay of one-way transmission in optical fiber is
, from transmitting terminal is transferred to receiving terminal, the frequency that band pass filter 1 leaches is so
signal be
, through coming in optical fiber after transmission back, the frequency that band pass filter 2 leaches is 0.5
signal be
, in frequency mixer 1
with
mixing, band pass filter 3 leaches the signal after conversion
, signal in frequency mixer 2
with
mixing, band pass filter 4 leaches the signal after lower conversion
, can see that, if processed without the inventive method, the signal after Optical Fiber Transmission is
, will have phase delay, and make transmission delay because environmental change causes optical fiber equivalent length to change
for variable, make
phase-unstable; Through the present invention, the signal finally obtaining
equal the signal that antenna reception arrives
, signal phase is stable.
In order to verify the effect of technical solution of the present invention, carried out following experiment: utilize radiofrequency signal stabilized fiber phase transmission system of the present invention by 6GHz radio signal transmission 20 km standard single-mode fibers (SMF).
In this experiment, adopted an alternative embodiment of the invention, its structure as shown in Figure 2, comprises transmitting terminal and receiving terminal.Transmitting terminal as shown in the figure, comprises light source 1, microwave source 1, MZ Mach-Zehnder 1, optical isolator, antenna, optical circulator 1, erbium-doped fiber amplifier, optical coupler; The optical input of MZ Mach-Zehnder 1, electric input port, light delivery outlet respectively with the delivery outlet of light source 1, the straight-through direction input port of the output of microwave source 1, optical isolator be connected, the straight-through direction delivery outlet of optical isolator is connected with the port 3 of optical coupler, the port one of optical coupler is connected with the port 2 of optical circulator 1, and the port 2 of optical coupler is connected with optical fiber, the port 3 of optical circulator 1 is connected with the input port of erbium-doped fiber amplifier, and the output port of erbium-doped fiber amplifier is connected with the port one of optical circulator.Transmitting terminal in the present embodiment in transmitting terminal and Fig. 1 is distinguished to some extent, speculum in Fig. 1 is replaced for three-port circulator and image intensifer (preferably erbium-doped fiber amplifier), this is due in embodiment, light modulating signal power after 20 km transmission is less, in order to amplify light modulating signal, with optical circulator and erbium-doped fiber amplifier, replaced the effect of speculum light signal to be amplified, radiofrequency signal stabilized fiber phase transmission system principle of the present invention does not change simultaneously.Receiving terminal as shown in the figure, comprises microwave source 2, light source 2, MZ Mach-Zehnder 2, photodetector, optical circulator 2, power splitter (50:50), band pass filter 1, band pass filter 2, band pass filter 3, band pass filter 4, frequency mixer 1, frequency mixer 2, the optical input of MZ Mach-Zehnder 2, electricity input port, light delivery outlet respectively with the delivery outlet of light source 2, the output of microwave source 2 is connected with the port one of optical circulator 2, the port 2 of optical circulator is connected with optical fiber, the light input end of photodetector is connected with the port 3 of optical circulator and the input port 1 of power splitter respectively with electric output, the output port 2 of power splitter is connected with band pass filter 1 input port, two input ports of frequency mixer 1 are connected with the output port of band pass filter 1 with microwave source 2 output ports respectively, the input port of band pass filter 3 is connected with the delivery outlet of frequency mixer 1, the input port of band pass filter 2 is connected with the output port of power splitter 3, two input ports of frequency mixer 2 are connected with band pass filter 3 with band pass filter 2 respectively, the delivery outlet of frequency mixer 2 is connected with band pass filter 4.It is the radiofrequency signal of 6 GHz that microwave source 1 generation frequency is set, it is the radiofrequency signal of 3 GHz that microwave source 2 produces frequency, fiber lengths is 20 km, and a tunable optical delay line is added between optical fiber and optical circulator 2 ports 2, for the artificial variation of introducing optical fiber link length.Its basic functional principle is identical with embodiment 1, repeats no more herein.
Fig. 3 is for being transferred to the eye pattern of 6 GHz radiofrequency signals of receiving terminal with sampling oscilloscope observation from transmitting terminal, wherein (a) is not through the steady eye pattern of the signal (output of band pass filter 1) of processing mutually of the present invention; (b) be the eye pattern of the signal (being the output of band pass filter 4) after processing mutually by the present invention is steady.Contrast (a) and (b) can find out, steady phase transmission method of the present invention can effectively suppress the phase jitter that radiofrequency signal is introduced in Optical Fiber Transmission.From (b), can observe certain intensity noise, this is mainly to make an uproar and cause due to the end of erbium-doped fiber amplifier, photodetector, tester.
Fig. 4 be with frequency spectrograph, measure from transmitting terminal, be transferred to the time jitter root-mean-square value of 6 GHz radiofrequency signals of receiving terminal.In figure, solid line is not pass through the time jitter root-mean-square value time dependent curve of the steady signal (being the output of band pass filter 1) of processing mutually of the present invention in 600 seconds, a value of every 3 seconds records.Can see, time jitter root-mean-square value can be up to 56.31ps.Dotted line is the time dependent curve of time jitter root-mean-square value in 600 seconds by the signal (being the output of band pass filter 4) after the steady processing mutually of the present invention, and a value of every 3 seconds records, can see, phase jitter is significantly suppressed.In observation time, time jitter root-mean-square value is no more than 1.9 ps, is equivalent to microwave signal phase shake and is less than 0.07 rad.
Claims (10)
1. a radiofrequency signal stabilized fiber phase transmission method, transmitting terminal will need transmitting radio frequency signal to carry out by optical fiber, to receiving terminal, transmitting after light modulation; It is characterized in that, receiving terminal is that described half the local oscillation signal of transmitting radio frequency signal frequency that needs carries out by described optical fiber, to transmitting terminal, transmitting after light modulation by frequency, and transmitting terminal is back to receiving terminal by the light modulating signal of the described local oscillation signal receiving by described optical fiber; Receiving terminal carries out demodulation to the light signal of inputting in described optical fiber, obtain hybrid radio frequency signal, then from described hybrid radio frequency signal, extract respectively the first signal identical with needing transmitting radio frequency signal frequency and the secondary signal identical with described local oscillation signal frequency; Finally, first described first signal and described local oscillation signal are carried out to up-conversion, more resulting signal and described secondary signal are carried out to down-conversion afterwards, finally obtain needing transmitting radio frequency signal.
2. a radiofrequency signal stabilized fiber phase transmission system, comprises the transmitting terminal and the receiving terminal that by optical fiber, connect, it is characterized in that,
Described transmitting terminal comprises: the first photoelectricity modulation module, optical isolator, light reflection mirror, three port optical couplers, the light output end of the first photoelectricity modulation module is connected with the straight-through direction input port of optical isolator, and three ports of three port optical couplers are connected with the straight-through direction delivery outlet of light reflection mirror, optical isolator, one end of described optical fiber respectively;
Described receiving terminal comprises: the first～the four-tape bandpass filter, the first frequency mixer, the second frequency mixer, the second photoelectricity modulation module, local oscillation signal source, three ports light rings, photodetector, power splitter, first of three port circulators～three port respectively with the light output end of the second photoelectricity modulation module, the other end of described optical fiber, the input of photodetector connects, the output of photodetector is connected with the input of power splitter, two outputs of power splitter respectively with the input of the first band pass filter, the input of the second band pass filter connects, two inputs of the first frequency mixer respectively with the output of the first band pass filter, local oscillation signal source connects, the output of the first frequency mixer is connected with an input of the second frequency mixer by the 3rd band pass filter, another input of the second frequency mixer, output respectively with the output of the second band pass filter, the input of four-tape bandpass filter connects, the microwave signal input of the second photoelectricity modulation module is connected with local oscillation signal source, the signal frequency that described local oscillation signal source produces is to need half of transmitting radio frequency signal frequency, the passband central frequency of described the first band pass filter and four-tape bandpass filter with need transmitting radio frequency signal frequency identical, the passband central frequency of described the second band pass filter is to need half of transmitting radio frequency signal frequency, and described the 3rd band pass filter passband central frequency is to need 1.5 times of transmitting radio frequency signal frequency.
3. radiofrequency signal stabilized fiber phase transmission system as claimed in claim 2, is characterized in that, described power splitter is the power splitter of 50 ︰ 50.
4. radiofrequency signal stabilized fiber phase transmission system as claimed in claim 2, is characterized in that, described the first～the four-tape bandpass filter is narrow band filter.
5. radiofrequency signal stabilized fiber phase transmission system as claimed in claim 2, is characterized in that, the electrooptic modulator in the first photoelectricity modulation module, the second photoelectricity modulation module is MZ Mach-Zehnder.
6. a radiofrequency signal stabilized fiber phase transmission system, comprises the transmitting terminal and the receiving terminal that by optical fiber, connect, it is characterized in that,
Described transmitting terminal comprises: the first photoelectricity modulation module, optical isolator, the one or three ports light rings, image intensifer, three port optical couplers, the light output end of the first photoelectricity modulation module is connected with the straight-through direction input port of optical isolator, three ports of three port optical couplers respectively with the second port of the one or three ports light rings, the straight-through direction delivery outlet of optical isolator, one end of described optical fiber connects, the 3rd port of the one or three ports light rings is connected with the input of image intensifer, the output of image intensifer is connected with the first port of the one or three ports light rings,
Described receiving terminal comprises: the first～the four-tape bandpass filter, the first frequency mixer, the second frequency mixer, the second photoelectricity modulation module, local oscillation signal source, the two or three ports light rings, photodetector, power splitter, first of the two or three port circulator～three port respectively with the light output end of the second photoelectricity modulation module, the other end of described optical fiber, the input of photodetector connects, the output of photodetector is connected with the input of power splitter, two outputs of power splitter respectively with the input of the first band pass filter, the input of the second band pass filter connects, two inputs of the first frequency mixer respectively with the output of the first band pass filter, local oscillation signal source connects, the output of the first frequency mixer is connected with an input of the second frequency mixer by the 3rd band pass filter, another input of the second frequency mixer, output respectively with the output of the second band pass filter, the input of four-tape bandpass filter connects, the microwave signal input of the second photoelectricity modulation module is connected with local oscillation signal source, the signal frequency that described local oscillation signal source produces is to need half of transmitting radio frequency signal frequency, the passband central frequency of described the first band pass filter and four-tape bandpass filter with need transmitting radio frequency signal frequency identical, the passband central frequency of described the second band pass filter is to need half of transmitting radio frequency signal frequency, and described the 3rd band pass filter passband central frequency is to need 1.5 times of transmitting radio frequency signal frequency.
7. radiofrequency signal stabilized fiber phase transmission system as claimed in claim 6, is characterized in that, described image intensifer is Erbium-Doped Fiber Amplifier.
8. radiofrequency signal stabilized fiber phase transmission system as claimed in claim 6, is characterized in that, the electrooptic modulator in the first photoelectricity modulation module, the second photoelectricity modulation module is MZ Mach-Zehnder.
9. radiofrequency signal stabilized fiber phase transmission system as claimed in claim 6, is characterized in that, described power splitter is the power splitter of 50 ︰ 50.
10. radiofrequency signal stabilized fiber phase transmission system as claimed in claim 6, is characterized in that, described the first～the four-tape bandpass filter is narrow band filter.
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