CN108494489A - A kind of radiofrequency signal surely mutually transmits device and method - Google Patents
A kind of radiofrequency signal surely mutually transmits device and method Download PDFInfo
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- CN108494489A CN108494489A CN201810268054.4A CN201810268054A CN108494489A CN 108494489 A CN108494489 A CN 108494489A CN 201810268054 A CN201810268054 A CN 201810268054A CN 108494489 A CN108494489 A CN 108494489A
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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
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude modulation
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Abstract
The invention discloses a kind of radiofrequency signals surely mutually to transmit device and method, including local side, the local side passes through optical fiber and distal end light connects, the local side includes phase bit comparison and the control module that light carries radiofrequency signal generation module and carries radiofrequency signal generation module light connects with the light, the phase bit comparison and control module include beam splitter and the phase compensator with 1 light connects of output end of the beam splitter, the phase compensator connects the optical fiber, further includes phase comparing component；Phase difference size is unchangeably transferred to from high-frequency signal on low frequency signal by the phase comparing component in the steady phase transmitting device of radiofrequency signal by the method for shift frequency heterodyne, improves the precision of phase difference detection, and then put forward high stable phase precision.
Description
Technical field
The present invention relates to Microwave photonics technical fields, and in particular to a kind of radiofrequency signal surely mutually transmits device and method.
Background technology
Steady phase transmission technology is a kind of technology keeping transmitting radio frequency signal phase stabilization, in radio astronomy, distribution
The fields such as synthetic aperture radar, the distribution of High-precision standard clock and particle accelerator have a wide range of applications.Since optical fiber has
The advantages that low-loss, price be low and electromagnetism interference, the steady phase transmission technology of radiofrequency signal based on microwave photon link is by wide
General concern.But the length of optical fiber can at random change due to environmental perturbation (the especially variation of temperature), in optical fiber
The delay of the signal experience of middle transmission is also shaken therewith, leads to the radiofrequency signal phase-unstable after transmission.In order to realize radio frequency
Signal phase after optical fiber is transferred to distal end keeps stablizing, and detects and compensates phase caused by being changed by fiber lengths in real time and tremble
It is dynamic to be particularly important.
Currently, the steady phase transmission technology of radiofrequency signal based on optical fiber mainly utilizes round-trip compensation principle, i.e., by comparing
The phase difference of transmission signal and reference signal after round trip, obtains the phase jitter of transmission link introducing, eventually by phase
The radiofrequency signal phase that position compensation makes distal end export keeps stablizing.High-precision phase-detection and phase compensation are to realize to be based on light
The key technology that fine high-frequency, remote, overstable radiofrequency signal are surely mutually transmitted.Conventional electrical phase based on electronics phase discriminator
Position detection technique, is limited, bandwidth of operation is narrow, and low to the phase-detection precision of high-frequency signal by electronic bottleneck.In recent years,
Radiofrequency signal based on microwave photon technology is surely mutually transmitted, and has the advantages that wide bandwidth and with high accuracy, but need high frequency light electrical resistivity survey
Survey and processing system, and there is still a need for use high frequency phase discriminator.
Invention content
It is an object of the invention to：A kind of radiofrequency signal is provided and surely mutually transmits device and method, solves current radio frequency letter
It is number steady mutually transmit during due to carrying out phase-detection using high frequency phase discriminator and high frequency detector, accuracy of detection is low and work band
The limited technical problem of width.
The technical solution adopted by the present invention is as follows：
A kind of steady phase transmitting device of radiofrequency signal, including local side, the local side pass through optical fiber and distal end light connects, institute
It includes the phase bit comparison that light carries radiofrequency signal generation module and carries radiofrequency signal generation module light connects with the light to state local side
With control module, the phase bit comparison and control module include beam splitter and 1 light connects of output end with the beam splitter
Phase compensator, the phase compensator connects the optical fiber, further includes phase comparing component, the phase comparing component packet
Photo-coupler, the phase compensator and photo-coupler light connects are included, the output port 2 of the beam splitter connects acousto-optic and moves
Frequency device, the acousto-optic frequency shifters and photo-coupler light connects, the output end of the photo-coupler respectively with optical band pass filter A and
Optical band pass filter B light connects, the optical band pass filter A and photodetector A light connects, the optical band pass filter B with
The output end of the photodetector B light connects, the photodetector A and photodetector B are electrically connected with electronics phase discriminator
It connects, the electronics phase discriminator is electrically connected with phase compensator.
Further, the photodetector A and photodetector B is low frequency photodetector.
Further, it includes light source, microwave source and electro-optic intensity modulator that the light, which carries radiofrequency signal generation module, described
Light source and electro-optic intensity modulator light connects, the microwave source electricity are electrically connected with the electro-optic intensity modulator, and the electric light is strong
Spend modulator and the beam splitter light connects.
Further, the distal end is radiofrequency signal recovery module, and the radiofrequency signal recovery module includes and optical fiber light
The reflective optical system of connection, the reflective optical system connect high frequency photodetector, and the high frequency photodetector output phase is stablized
Radiofrequency signal.
Further, the reflective optical system reflects the part light from optical fiber, and the reflective optical system is by optical circulator and light
The combination of beam splitter is constituted or is made of faraday rotation mirror.
Further, one during the phase compensator is rolled up by adjustable optical delay line, light stretcher and temperature control light
It constitutes.
A kind of steady phase transmission method of radiofrequency signal, includes the following steps：
Step 1：Local side generates modulated signal and be divided using the double sideband modulation method that carrier wave inhibits to be believed for transmission light
Number and reference optical signal；
Step 2：The transmission optical signal is transmitted to distal end through optical fiber, and by being distally back to local side, believes with reference light
It number is transmitted to phase comparing component together and carries out phase difference detection；
Step 3：Local side utilizes the output signal of phase difference detection, control phase compensator to carry out phase compensation, makes remote
The radiofrequency signal phase of end output keeps stablizing.
Further, phase difference detection is carried out using phase comparing component in the step 2 to be as follows：
S201：Acousto-optic frequency shifters in phase comparing component carry out shift frequency to the reference optical signal, and to the biography of return
Reference optical signal after optical signals and shift frequency is coupled；
S202：Using two optical band pass filters, transmission optical signal and shift frequency reference optical signal after coupling are filtered out respectively
+ 1 rank optical sideband and -1 rank optical sideband, and be utilized respectively two photodetectors and be detected, obtain two low frequency signals；；
S203：Phase difference detection is carried out to two low frequency electrical signal.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1. the phase comparing component in the steady phase transmitting device of radiofrequency signal, big by phase difference by the method for shift frequency heterodyne
It is small to be unchangeably transferred on low frequency signal from high-frequency signal, the precision of phase difference detection is improved, and then put forward high stable phase precision.
2. high frequency photodetector and high-frequency electronic phase discriminator are not used in phase comparing component, visited only with low frequency photoelectricity
Device and low-frequency electronic phase discriminator are surveyed, reduces system cost, while improving the bandwidth of operation of system.
3. light carries the double sideband modulation mode that radiofrequency signal generation module uses carrier wave to inhibit, overcomes and transmit in a fiber
When the signal period property fade-out caused by dispersion, realize long distance transmission.
Description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is the overall schematic of the present invention；
Fig. 2 is the spectrogram of 2 × 2 photo-couplers output optical signal L3.
Specific implementation mode
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
It elaborates to the present invention with reference to Fig. 1, Fig. 2.
A kind of steady phase transmitting device of radiofrequency signal, including local side, the local side pass through optical fiber and distal end light connects, institute
It includes the phase bit comparison that light carries radiofrequency signal generation module and carries radiofrequency signal generation module light connects with the light to state local side
With control module, the phase bit comparison and control module include beam splitter and 1 light connects of output end with the beam splitter
Phase compensator, the phase compensator connects the optical fiber, further includes phase comparing component, the phase comparing component packet
Photo-coupler, the phase compensator and photo-coupler light connects are included, the output port 2 of the beam splitter connects acousto-optic frequency translation
Device, the acousto-optic frequency shifters and photo-coupler light connects, the output end of the photo-coupler respectively with optical band pass filter A and light
Bandpass filter B light connects, the optical band pass filter A and photodetector A light connects, the optical band pass filter B and institute
Stating photodetector B light connects, the output end of the photodetector A and photodetector B are electrically connected with electronics phase discriminator,
The electronics phase discriminator is electrically connected with phase compensator.
The photodetector A and photodetector B is low frequency photodetector.
It includes light source, microwave source and electro-optic intensity modulator that the light, which carries radiofrequency signal generation module, the light source and electricity
Light intensity modulator light connects, the microwave source electricity are electrically connected with the electro-optic intensity modulator, the electro-optic intensity modulator
With the beam splitter light connects.
The distal end is radiofrequency signal recovery module, and the radiofrequency signal recovery module includes anti-with the light of optical fiber light connects
Emitter, the reflective optical system connect high frequency photodetector, the radiofrequency signal that the high frequency photodetector output phase is stablized.
The reflective optical system reflects the part light from optical fiber, the reflective optical system by optical circulator and beam splitter group
It closes and constitutes or be made of faraday rotation mirror.
One during the phase compensator is rolled up by adjustable optical delay line, light stretcher and temperature control light is constituted.
A kind of steady phase transmission method of radiofrequency signal, includes the following steps：
Step 1：Local side generates modulated signal and be divided using the double sideband modulation method that carrier wave inhibits to be believed for transmission light
Number and reference optical signal；
Step 2：The transmission optical signal is transmitted to distal end through optical fiber, and by being distally back to local side, believes with reference light
It number is transmitted to phase comparing component together and carries out phase difference detection；
Step 3：Local side utilizes the output signal of phase difference detection, control phase compensator to carry out phase compensation, makes remote
The radiofrequency signal phase of end output keeps stablizing.
Further, phase difference detection is carried out using phase comparing component in the step 2 to be as follows：
S201：Acousto-optic frequency shifters in phase comparing component carry out shift frequency to the reference optical signal, and to the biography of return
Reference optical signal after optical signals and shift frequency is coupled；
S202：Using two optical band pass filters, transmission optical signal and shift frequency reference optical signal after coupling are filtered out respectively
+ 1 rank optical sideband and -1 rank optical sideband, and be utilized respectively two photodetectors and be detected, obtain two low frequency signals；；
S203：Phase difference detection is carried out to two low frequency electrical signal.
Specific embodiment 1
A kind of steady phase transmitting device of radiofrequency signal, including local side, the local side pass through optical fiber and distal end light connects, institute
It includes the phase bit comparison that light carries radiofrequency signal generation module and carries radiofrequency signal generation module light connects with the light to state local side
With control module, the phase bit comparison and control module include beam splitter and 1 light connects of output end with the beam splitter
Phase compensator positive input, the positive output end of the phase compensator is all connected with the light with reverse input end
It is fine；
Further include phase comparing component, the phase comparing component includes photo-coupler, and the coupler is 2 × 2 optocouplers
Clutch, the inverse output terminal of the phase compensator and 1 light connects of input port of photo-coupler, the output of the beam splitter
The connection of port 2 acousto-optic frequency shifters, 2 light connects of input port of the acousto-optic frequency shifters and photo-coupler, the photo-coupler
Output port 1 connects optical band pass filter A, the optical band pass filter A and low frequency photodetector A light connects, the low frequency
The output end of photodetector A is electrically connected with the input port 1 of electronics phase discriminator, and the output port 2 of the photo-coupler connects
Optical band pass filter B, the optical band pass filter B and low frequency photodetector B light connects, the low frequency photodetector B's
Output end is electrically connected with the input port 2 of electronics phase discriminator, and the output end of the electronics phase discriminator is electrically connected with phase compensator；
The phase compensator is made of light stretcher.
The distal end is radiofrequency signal recovery module, and the radiofrequency signal recovery module includes anti-with the light of optical fiber light connects
Emitter, the reflective optical system reflect the part light from optical fiber, and the light of reflection is passed to optical fiber in phase compensator, the reflection
The optical transport of device transmission is as the high frequency photodetector of the reflective optical system light connects, the high frequency photodetector the output phase
The radiofrequency signal that position is stablized；The reflective optical system is made of faraday rotation mirror.
It includes light source, microwave source and electro-optic intensity modulator that the light, which carries radiofrequency signal generation module, and the light source light connects
Connect electro-optic intensity modulator, the microwave source is electrically connected the electro-optic intensity modulator, the electro-optic intensity modulator with it is described
The input terminal light connects of beam splitter.
Specific embodiment 2
The present embodiment is based on embodiment 1, the main transmission method for illustrating the present invention.
Step 1：If the optical carrier of the Double Sideband Suppressed Carrier modulation of local side electro-optic intensity modulator output is L1,
In the optical carrier light is not concerned with since the present apparatus and method only focus on phase information comprising two light wave Ω 1 and Ω 2
Carrier-signal amplitude size, therefore light wave Ω 1 and Ω 2 are expressed as：
Wherein, j indicates that imaginary number, t indicate time, ωcIndicate the angular frequency of the optical carrier of lasing light emitter output, ωRFTable
Show the angular frequency of the radiofrequency signal of microwave source output,The phase of light wave Ω 1,Indicate the phase of light wave Ω 2.
Step 2：Optical carrier L1 is transmission optical signal and reference optical signal, the transmission light letter through beam splitter light splitting
It is number primary through optical fiber round-trip transmission, since randomized jitter has occurred in ambient temperature variation and mechanical oscillation, the phase of signal, transmit
Optical signal returns to after local side that become optical signal L2, the optical signal L2 include two light wave Ω 3 and Ω 4, is expressed as：
Wherein, j indicates that imaginary number, t indicate time, ωcIndicate the angular frequency of the optical carrier of lasing light emitter output, ωRFTable
Show the angular frequency of the radiofrequency signal of microwave source output,The phase of light wave Ω 3,Indicate the phase of light wave Ω 4.
Step 3：Since reference optical signal is the part in optical carrier L1, reference optical signal is carried with the light
Wave signal is substantially identical；Reference optical signal shift frequency Δ ω (being less than 100MHz) after acousto-optic frequency shifters, obtain optical signal
L1 ', wherein optical signal L1 ＇ include that Ω 1 ＇ and Ω 1 ＇ of 2 ＇, Ω and 2 ＇ of Ω are expressed as：
Wherein, j indicates that imaginary number, t indicate time, ωcIndicate the angular frequency of the optical carrier of lasing light emitter output, ωRFTable
Show the angular frequency of the radiofrequency signal of microwave source output,The phase of 1 ＇ of light wave Ω,Indicate the phase of 2 ＇ of light wave Ω.
Since reference optical signal changes identical frequency, the phase of 2 ＇ of Ω 1 ＇ and Ω after acousto-optic frequency shifters shift frequency
The difference very little of difference and the phase difference of Ω 1 and Ω 2, and be a fixed value, it can be neglected, be approximately considered：
Optical signal L1 ＇ couple with optical signal L2 in 2 × 2 photo-coupler to obtain optical signal L3, the optical signal L3's
Spectrogram is as shown in Figure 2；
Optical signal L3 obtains optical signal L4 after optical band pass filter A, and optical signal L3 is obtained after optical band pass filter B
Passband central frequency to optical signal L5, optical band pass filter A is ωc-ωRF, the passband central frequency of optical band pass filter B is
ωc+ωRF, then optical signal L4 includes two light wave Ω 1 ＇ and Ω 3, and optical signal L5 includes two light wave Ω 2 ＇ and Ω 4；
For optical signal L4 after low frequency photodetector A beat frequencies, detection obtains the low frequency electrical signal that frequency size is Δ ω
V1；For optical signal L5 after low frequency photodetector B beat frequencies, detection obtains the low frequency electrical signal V that frequency size is Δ ω2,
It is embodied as：
Step 4：By electric signal V1And V2It is input in low frequency phase discriminator, the output voltage of phase discriminator is by V1And V2Phase
DifferenceIt determines,It is expressed as：
Wherein,To transmit the phase of contained radio frequency number on optical signal after optical fiber round-trip transmission is primary, andFor the phase of contained radiofrequency signal on local side reference optical signal, thenThe phase of transmitting radio frequency signal as to be asked
Shake controls phase compensator using phase jitter information, is pre-compensated for the phase jitter of the radiofrequency signal of transmission, finally
In the radiofrequency signal for distally obtaining phase stabilization.
The operation principle of the present invention is that：
The light of local side carries radiofrequency signal generation module and utilizes electro-optic intensity modulator, using suppressed-carrier double side band tune
Mode processed generates modulated optical signal, and modulated optical signal is divided into two by beam splitter, and a part is sent into as transmission optical signal
Transmission Fibers simultaneously return to local side by the reflective optical system of distal end, and another part, which is used as, refers to optical signal, and returns to local side
Transmission optical signal is sent into phase comparing component together；In phase comparing component, reference optical signal passes through acousto-optic frequency shifters shift frequency
After (being less than 100MHz), optical band pass filter A and light belt are respectively enterd after being coupled by 2 × 2 photo-couplers with transmission optical signal
Bandpass filter B, optical band pass filter A filter out coupling after optical signal+1 rank optical sideband and by low frequency photodetector A detect, light
Bandpass filter B filter out coupling after optical signal -1 rank optical sideband and by low frequency photodetector B detect；Electronics phase discriminator is to low
The output signal of frequency photodetector A and low frequency photodetector B carry out phase difference detection, the output signal control of electronics phase discriminator
Phase compensator processed carries out phase compensation, realizes that the steady of radiofrequency signal mutually transmits.+ 1 ,-the 1 of the electro-optic intensity modulator generation
The frequency interval of rank optical sideband is the frequency of radiofrequency signal.
Claims (8)
1. a kind of steady phase transmitting device of radiofrequency signal, including local side, the local side are described by optical fiber and distal end light connects
Local side include light carry radiofrequency signal generation module and with the light carry radiofrequency signal generation module light connects phase bit comparison with
Control module, the phase bit comparison and control module include beam splitter and 1 light connects of output end with the beam splitter
Phase compensator, the phase compensator connect the optical fiber, it is characterised in that：Further include phase comparing component, the phase
Comparing component includes photo-coupler, and the output port 2 of the phase compensator and photo-coupler light connects, the beam splitter connects
Acousto-optic frequency shifters, the acousto-optic frequency shifters and photo-coupler light connects are connect, the output end of the photo-coupler is logical with light belt respectively
Filter A and optical band pass filter B light connects, the optical band pass filter A and photodetector A light connects, the light belt are logical
The output end of filter B and the photodetector B light connects, the photodetector A and photodetector B reflect with electronics
Phase device is electrically connected, and the electronics phase discriminator is electrically connected with phase compensator.
2. the steady phase transmitting device of a kind of radiofrequency signal according to claim 1, it is characterised in that：The photodetector A
It is low frequency photodetector with photodetector B.
3. the steady phase transmitting device of a kind of radiofrequency signal according to claim 1, it is characterised in that：The light carries radiofrequency signal
Generation module includes light source, microwave source and electro-optic intensity modulator, the light source and electro-optic intensity modulator light connects, described micro-
Wave source is electrically connected with the electro-optic intensity modulator, the electro-optic intensity modulator and the beam splitter light connects.
4. the steady phase transmitting device of a kind of radiofrequency signal according to claim 1, it is characterised in that：Believe for radio frequency the distal end
Number recovery module, the radiofrequency signal recovery module includes the reflective optical system with optical fiber light connects, and the reflective optical system connection is high
Frequency photodetector, the radiofrequency signal that the high frequency photodetector output phase is stablized.
5. the steady phase transmitting device of a kind of radiofrequency signal according to claim 4, it is characterised in that：The reflective optical system reflection
Part light from optical fiber, the reflective optical system are made of the combination of optical circulator and beam splitter or by faraday rotation mirror structures
At.
6. the steady phase transmitting device of a kind of radiofrequency signal according to claim 1, it is characterised in that：The phase compensator by
A composition in adjustable optical delay line, light stretcher and temperature control light volume.
7. a kind of steady phase transmission method of radiofrequency signal, it is characterised in that：Include the following steps：
Step 1：Local side generates modulated signal using the double sideband modulation method that carrier wave inhibits, and is divided into biography by beam splitter
Optical signals and reference optical signal；
Step 2：The transmission optical signal is transmitted to distal end through optical fiber, and by being distally back to local side, with reference optical signal one
And it is transmitted to phase comparing component and carries out phase difference detection；
Step 3：Local side utilizes the output signal of phase difference detection, control phase compensator to carry out phase compensation, keep distal end defeated
The radiofrequency signal phase gone out keeps stablizing.
8. the steady phase transmission method of a kind of radiofrequency signal according to claim 7, it is characterised in that：It is utilized in the step 2
Phase comparing component carries out phase difference detection and is as follows：
S201：Acousto-optic frequency shifters in phase comparing component carry out shift frequency to the reference optical signal, and to the transmission light of return
Reference optical signal after signal and shift frequency is coupled；
S202：Using two optical band pass filters ,+1 of transmission optical signal and shift frequency reference optical signal after coupling is filtered out respectively
Rank optical sideband and -1 rank optical sideband, and be utilized respectively two photodetectors and be detected, obtain two low frequency signals；
S203：Phase difference detection is carried out to two low frequency electrical signal.
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