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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- 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
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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 invention relates to the technical field of microwave photonics, in particular to a radio frequency signal phase-stabilizing transmission device and a radio frequency signal phase-stabilizing transmission method.
Background
The phase-stable transmission technology is a technology for keeping the phase stability of a transmitted radio frequency signal, and has wide application in the fields of radio astronomy, distributed synthetic aperture radar, high-precision standard clock distribution, particle accelerators and the like. Because the optical fiber has the advantages of low loss, low price, electromagnetic interference resistance and the like, the radio frequency signal phase-stable transmission technology based on the microwave photon link is widely concerned. However, the length of the optical fiber changes randomly due to environmental disturbance (especially, temperature change), so that the delay experienced by the signal transmitted in the optical fiber is also jittered, resulting in unstable phase of the transmitted rf signal. In order to keep the phase of the radio frequency signal stable after the radio frequency signal is transmitted to the far end through the optical fiber, it is important to detect and compensate the phase jitter caused by the length change of the optical fiber in real time.
At present, the phase-stable transmission technology of radio frequency signals based on optical fibers mainly utilizes a round-trip compensation principle, that is, phase jitter introduced by a transmission link is obtained by comparing the phase difference between a transmission signal after round-trip and a reference signal, and finally, the phase of the radio frequency signal output from a far end is kept stable through phase compensation. High-precision phase detection and phase compensation are key technologies for realizing stable phase transmission of high-frequency, long-distance and ultra-stable radio frequency signals based on optical fibers. The traditional electrical phase detection technology based on the electronic phase discriminator is limited by an electronic bottleneck, the working bandwidth is narrow, and the phase detection precision of high-frequency signals is low. In recent years, radio frequency signal phase-stable transmission based on microwave photon technology has the advantages of wide bandwidth and high precision, but a high-frequency photoelectric detection and processing system is required, and a high-frequency phase discriminator is still required.
Disclosure of Invention
The invention aims to: the device and the method for transmitting the stable phase of the radio frequency signal solve the technical problems of low detection precision and limited working bandwidth caused by adopting a high-frequency phase discriminator and a high-frequency detector to carry out phase detection in the current stable phase transmission process of the radio frequency signal.
The technical scheme adopted by the invention is as follows:
a radio frequency signal phase-stabilizing transmission device comprises a local end, wherein the local end is optically connected with a far end through an optical fiber, the local end comprises an optical carrier radio frequency signal generation module and a phase comparison and control module which is optically connected with the optical carrier radio frequency signal generation module, the phase comparison and control module comprises an optical beam splitter and a phase compensator which is optically connected with an output end 1 of the optical beam splitter, the phase compensator is connected with the optical fiber, the phase comparison device further comprises a phase comparison assembly, the phase comparison assembly comprises an optical coupler, the phase compensator is optically connected with the optical coupler, an output port 2 of the optical beam splitter is connected with an acousto-optic frequency shifter, the acousto-optic frequency shifter is optically connected with the optical coupler, the output end of the optical coupler is respectively optically connected with an optical band-pass filter A and an optical band-pass filter B, and the optical band-pass filter A is optically connected with an optical photodetector A, the optical band-pass filter B is connected with the photoelectric detector B in an optical mode, the output ends of the photoelectric detector A and the photoelectric detector B are electrically connected with the electronic phase detector, and the electronic phase detector is electrically connected with the phase compensator.
Further, the photoelectric detector a and the photoelectric detector B are both low-frequency photoelectric detectors.
Further, the optical carrier radio frequency signal generation module comprises a light source, a microwave source and an electro-optical intensity modulator, wherein the light source is optically connected with the electro-optical intensity modulator, the microwave source is electrically connected with the electro-optical intensity modulator, and the electro-optical intensity modulator is optically connected with the optical beam splitter.
Further, the far end is a radio frequency signal recovery module, the radio frequency signal recovery module comprises a light reflector optically connected with the optical fiber, the light reflector is connected with a high-frequency photoelectric detector, and the high-frequency photoelectric detector outputs a radio frequency signal with a stable phase.
Further, the optical reflector reflects part of light from the optical fiber, and the optical reflector is formed by a combination of an optical circulator and an optical beam splitter or a faraday rotator mirror.
Further, the phase compensator is composed of one of a tunable light delay line, a light stretcher and a temperature-controlled light coil.
A radio frequency signal phase-stable transmission method comprises the following steps:
step 1: the local end generates a modulation signal by using a double-sideband modulation method of carrier suppression and splits the modulation signal into a transmission optical signal and a reference optical signal;
step 2: the transmission optical signal is transmitted to the far end through the optical fiber, returns to the local end from the far end, and is transmitted to the phase comparison component together with the reference optical signal for phase difference detection;
and step 3: the local end controls the phase compensator to perform phase compensation by using the output signal of the phase difference detection, so that the phase of the radio-frequency signal output by the remote end is kept stable.
Further, the specific steps of using the phase comparison module to detect the phase difference in step 2 are as follows:
s201: an acousto-optic frequency shifter in the phase comparison component shifts the frequency of the reference optical signal and couples the returned transmission optical signal and the frequency-shifted reference optical signal;
s202: respectively filtering out +1 order optical sidebands and-1 order optical sidebands of the coupled transmission optical signal and the frequency shift reference optical signal by using two optical bandpass filters, and respectively detecting by using two photoelectric detectors to obtain two low-frequency signals; (ii) a
S203: and detecting the phase difference of the two low-frequency electric signals.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. a phase comparison component in the radio frequency signal phase stabilization transmission device transfers the phase difference from a high-frequency signal to a low-frequency signal unchanged by a frequency shift heterodyne method, so that the phase difference detection precision is improved, and the phase stabilization precision is further improved.
2. The phase comparison component does not use a high-frequency photoelectric detector and a high-frequency electronic phase discriminator, and only uses a low-frequency photoelectric detector and a low-frequency electronic phase discriminator, so that the system cost is reduced, and meanwhile, the working bandwidth of the system is improved.
3. The optical carrier radio frequency signal generation module adopts a carrier suppression double-sideband modulation mode, overcomes the signal periodic fading phenomenon caused by dispersion during transmission in an optical fiber, and realizes long-distance transmission.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is an overall schematic view of the present invention;
fig. 2 is a spectral diagram of the 2 × 2 optical coupler output optical signal L3.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
The present invention will be described in detail with reference to fig. 1 and 2.
A radio frequency signal phase-stabilizing transmission device comprises a local end, wherein the local end is optically connected with a far end through an optical fiber, the local end comprises an optical carrier radio frequency signal generation module and a phase comparison and control module which is optically connected with the optical carrier radio frequency signal generation module, the phase comparison and control module comprises an optical beam splitter and a phase compensator which is optically connected with an output end 1 of the optical beam splitter, the phase compensator is connected with the optical fiber, the phase comparison device further comprises a phase comparison assembly, the phase comparison assembly comprises an optical coupler, the phase compensator is optically connected with the optical coupler, an output port 2 of the optical beam splitter is connected with an acousto-optic frequency shifter, the acousto-optic frequency shifter is optically connected with the optical coupler, the output end of the optical coupler is respectively optically connected with an optical band-pass filter A and an optical band-pass filter B, and the optical band-pass filter A is optically connected with an optical photodetector A, the optical band-pass filter B is connected with the photoelectric detector B in an optical mode, the output ends of the photoelectric detector A and the photoelectric detector B are electrically connected with the electronic phase detector, and the electronic phase detector is electrically connected with the phase compensator.
And the photoelectric detector A and the photoelectric detector B are both low-frequency photoelectric detectors.
The light-carrying radio frequency signal generation module comprises a light source, a microwave source and an electro-optical intensity modulator, wherein the light source is optically connected with the electro-optical intensity modulator, the microwave source is electrically connected with the electro-optical intensity modulator, and the electro-optical intensity modulator is optically connected with the optical beam splitter.
The far end is a radio frequency signal recovery module, the radio frequency signal recovery module comprises a light reflector which is in optical connection with an optical fiber, the light reflector is connected with a high-frequency photoelectric detector, and the high-frequency photoelectric detector outputs a radio frequency signal with stable phase.
The optical reflector reflects part of light from the optical fiber, and is composed of a combination of an optical circulator and an optical beam splitter or a Faraday rotator mirror.
The phase compensator is composed of one of an adjustable light delay line, a light stretcher and a temperature control light coil.
A radio frequency signal phase-stable transmission method comprises the following steps:
step 1: the local end generates a modulation signal by using a double-sideband modulation method of carrier suppression and splits the modulation signal into a transmission optical signal and a reference optical signal;
step 2: the transmission optical signal is transmitted to the far end through the optical fiber, returns to the local end from the far end, and is transmitted to the phase comparison component together with the reference optical signal for phase difference detection;
and step 3: the local end controls the phase compensator to perform phase compensation by using the output signal of the phase difference detection, so that the phase of the radio-frequency signal output by the remote end is kept stable.
Further, the specific steps of using the phase comparison module to detect the phase difference in step 2 are as follows:
s201: an acousto-optic frequency shifter in the phase comparison component shifts the frequency of the reference optical signal and couples the returned transmission optical signal and the frequency-shifted reference optical signal;
s202: respectively filtering out +1 order optical sidebands and-1 order optical sidebands of the coupled transmission optical signal and the frequency shift reference optical signal by using two optical bandpass filters, and respectively detecting by using two photoelectric detectors to obtain two low-frequency signals; (ii) a
S203: and detecting the phase difference of the two low-frequency electric signals.
Detailed description of the preferred embodiment 1
A radio frequency signal phase-stable transmission device comprises a local end, wherein the local end is optically connected with a far end through an optical fiber, the local end comprises an optical carrier radio frequency signal generation module and a phase comparison and control module which is optically connected with the optical carrier radio frequency signal generation module, the phase comparison and control module comprises an optical beam splitter and a forward input end of a phase compensator which is optically connected with an output end 1 of the optical beam splitter, and the forward output end and the reverse input end of the phase compensator are both connected with the optical fiber;
still include the phase comparison subassembly, the phase comparison subassembly includes the optical coupler, the coupler is 2 x 2 optical coupler, the reverse output of phase compensator is connected with input port 1 optical connection of optical coupler, the reputation frequency shifter is connected to output port 2 of optical beam splitter, the reputation frequency shifter is connected with input port 2 optical connection of optical coupler, optical band pass filter A is connected to output port 1 of optical coupler, optical band pass filter A is connected with low frequency photoelectric detector A optical connection, low frequency photoelectric detector A's output is connected with input port 1 electric of electronic phase discriminator, optical band pass filter B is connected to output port 2 of optical coupler, optical band pass filter B and low frequency photoelectric detector B, low frequency photoelectric detector B's output is connected with input port 2 electric of electronic phase discriminator, the output end of the electronic phase discriminator is electrically connected with the phase compensator; the phase compensator is composed of a light stretcher.
The far end is provided with a radio frequency signal recovery module, the radio frequency signal recovery module comprises an optical reflector which is optically connected with an optical fiber, the optical reflector reflects part of light from the optical fiber, the reflected light is transmitted into a phase compensator along with the optical fiber, the light transmitted by the reflector is transmitted to a high-frequency photoelectric detector which is optically connected with the optical reflector, and the high-frequency photoelectric detector outputs a radio frequency signal with stable phase; the optical reflector is composed of a Faraday rotator mirror.
The light-carrying radio frequency signal generation module comprises a light source, a microwave source and an electro-optic intensity modulator, wherein the light source is in optical connection with the electro-optic intensity modulator, the microwave source is electrically connected with the electro-optic intensity modulator, and the electro-optic intensity modulator is in optical connection with the input end of the optical beam splitter.
Specific example 2
This embodiment is mainly based on embodiment 1, and mainly explains the transmission method of the present invention.
Step 1: the optical carrier signal output by the local-end electro-optical intensity modulator and subjected to carrier suppression double-sideband modulation is set to be L1, the optical carrier signal comprises two optical waves omega 1 and omega 2, and because the device and the method only pay attention to phase information and do not pay attention to amplitude of the optical carrier signal, the optical waves omega 1 and omega 2 are respectively expressed as:
where j represents an imaginary number, t represents time, ωcRepresenting the angular frequency, omega, of an optical carrier signal output by a laser sourceRFRepresenting the angular frequency of the rf signal output by the microwave source,the phase of the light wave omega 1 is,representing the phase of the optical wave omega 2.
Step 2: the optical carrier signal L1 is split into a transmission optical signal and a reference optical signal by an optical splitter, the transmission optical signal is transmitted back and forth once through an optical fiber, the phase of the signal is randomly jittered due to the external temperature change and mechanical vibration, the transmission optical signal returns to the local end and becomes an optical signal L2, and the optical signal L2 includes two optical waves Ω 3 and Ω 4, which are respectively expressed as:
where j represents an imaginary number, t represents time, ωcRepresenting the angular frequency, omega, of an optical carrier signal output by a laser sourceRFRadio frequency representing microwave source outputThe angular frequency of the signal is such that,the phase of the light wave omega 3 is,representing the phase of the optical wave omega 4.
And step 3: since the reference optical signal is part of the optical carrier signal L1, the reference optical signal is substantially the same as the optical carrier signal; the reference optical signal is frequency-shifted by Δ ω (less than 100MHz) by the acousto-optic frequency shifter to obtain an optical signal L1 ', wherein the optical signal L1' includes Ω 1 'and Ω 2', and Ω 1 'and Ω 2' are expressed as:
where j represents an imaginary number, t represents time, ωcRepresenting the angular frequency, omega, of an optical carrier signal output by a laser sourceRFRepresenting the angular frequency of the rf signal output by the microwave source,the phase of the light wave omega 1' is,representing the phase of the light wave omega 2'.
Since the reference optical signal changes the same frequency after frequency shift by the acousto-optic frequency shifter, the difference between the phase difference of Ω 1 'and Ω 2' and the phase difference of Ω 1 and Ω 2 is very small and is a fixed value, which can be ignored and approximately considered as:
the optical signal L1' and the optical signal L2 are coupled in a 2 × 2 optical coupler to obtain an optical signal L3, and the spectrogram of the optical signal L3 is shown in FIG. 2;
the optical signal L3 passes through an optical band-pass filter A to obtain an optical signal L4, the optical signal L3 passes through an optical band-pass filter B to obtain an optical signal L5, and the center frequency of the pass band of the optical band-pass filter A is omegac-ωRFThe center frequency of the pass band of the optical band-pass filter B is omegac+ωRFThen the optical signal L4 includes two light waves Ω 1 'and Ω 3, and the optical signal L5 includes two light waves Ω 2' and Ω 4;
after the optical signal L4 is subjected to beat frequency by the low-frequency photoelectric detector A, a low-frequency electric signal V with the frequency of delta omega is obtained through detection1(ii) a After the optical signal L5 is subjected to beat frequency by the low-frequency photoelectric detector B, a low-frequency electric signal V with the frequency of delta omega is obtained through detection2，
The concrete expression is as follows:
and 4, step 4: will the electric signal V1And V2The output voltage of the low-frequency phase detector is V1And V2Is not equal toIt is decided that,expressed as:
wherein,for transmitting the phase of the radio-frequency signal carried on the optical signal after one round trip transmission through the optical fiberThe phase of the RF signal carried on the local reference optical signalNamely, the phase jitter of the radio frequency signal to be transmitted is obtained, the phase jitter information is utilized to control the phase compensator, the phase jitter of the transmitted radio frequency signal is pre-compensated, and finally the radio frequency signal with stable phase is obtained at a far end.
The working principle of the invention is as follows:
the optical carrier radio frequency signal generating module at the local end generates a modulated optical signal by using an optical intensity modulator and adopting a double-sideband modulation mode of inhibiting carrier waves, the modulated optical signal is divided into two parts by an optical beam splitter, one part of the modulated optical signal is used as a transmission optical signal and sent into a transmission optical fiber and returned to the local end by a remote optical reflector, and the other part of the modulated optical signal is used as a reference optical signal and sent into a phase comparison component together with the transmission optical signal returned to the local end; in the phase comparison component, after the frequency of a reference optical signal is shifted by an acousto-optic frequency shifter (less than 100MHz), the reference optical signal and a transmission optical signal are coupled by a 2X 2 optical coupler and then respectively enter an optical band-pass filter A and an optical band-pass filter B, the optical band-pass filter A filters out a +1 order optical sideband of the coupled optical signal and is detected by a low-frequency photoelectric detector A, and the optical band-pass filter B filters out a-1 order optical sideband of the coupled optical signal and is detected by a low-frequency photoelectric detector B; the electronic phase discriminator detects the phase difference of the output signals of the low-frequency photoelectric detector A and the low-frequency photoelectric detector B, and the output signals of the electronic phase discriminator control the phase compensator to perform phase compensation, so that the stable phase transmission of radio-frequency signals is realized. The frequency interval of the + 1-1 order optical sidebands generated by the electro-optical intensity modulator is the frequency of the radio frequency signal.
Claims (8)
1. A phase-stabilized transmission apparatus for radio frequency signals, comprising a local end optically connected to a remote end via an optical fiber, the local end comprising an optical rf signal generating module and a phase comparison and control module optically connected to the optical rf signal generating module, the phase comparison and control module comprising an optical splitter and a phase compensator optically connected to an output terminal 1 of the optical splitter, the phase compensator being connected to the optical fiber, the phase compensator comprising: still include the phase comparison subassembly, the phase comparison subassembly includes optical coupler, phase compensator and optical coupler connection, the reputation frequency shifter is connected to the output port 2 of optical splitter, the reputation frequency shifter is connected with the optical coupler connection, the output of optical coupler is connected with light band-pass filter A and light band-pass filter B light respectively, light band-pass filter A is connected with photoelectric detector A light, light band-pass filter B with photoelectric detector B light is connected, photoelectric detector A and photoelectric detector B's output all is connected with the electron phase discriminator electricity, the electron phase discriminator is connected with the phase compensator electricity.
2. The radio frequency signal phase-stable transmission device according to claim 1, wherein: and the photoelectric detector A and the photoelectric detector B are both low-frequency photoelectric detectors.
3. The radio frequency signal phase-stable transmission device according to claim 1, wherein: the light-carrying radio frequency signal generation module comprises a light source, a microwave source and an electro-optical intensity modulator, wherein the light source is in optical connection with the electro-optical intensity modulator, the microwave source is electrically connected with the electro-optical intensity modulator, and the electro-optical intensity modulator is in optical connection with the optical beam splitter.
4. The radio frequency signal phase-stable transmission device according to claim 1, wherein: the far end is a radio frequency signal recovery module, the radio frequency signal recovery module comprises a light reflector which is in optical connection with an optical fiber, the light reflector is connected with a high-frequency photoelectric detector, and the high-frequency photoelectric detector outputs a radio frequency signal with stable phase.
5. The radio frequency signal phase-stable transmission device according to claim 4, wherein: the optical reflector reflects part of light from the optical fiber, and is composed of a combination of an optical circulator and an optical beam splitter or a Faraday rotator mirror.
6. The radio frequency signal phase-stable transmission device according to claim 1, wherein: the phase compensator is composed of one of an adjustable light delay line, a light stretcher and a temperature control light coil.
7. A radio frequency signal phase-stable transmission method is characterized in that: the method comprises the following steps:
step 1: the local end generates a modulation signal by using a double-sideband modulation method of carrier suppression, and the modulation signal is divided into a transmission optical signal and a reference optical signal by an optical beam splitter;
step 2: the transmission optical signal is transmitted to the far end through the optical fiber, returns to the local end from the far end, and is transmitted to the phase comparison component together with the reference optical signal for phase difference detection;
and step 3: the local end controls the phase compensator to perform phase compensation by using the output signal of the phase difference detection, so that the phase of the radio-frequency signal output by the remote end is kept stable.
8. The method for phase-stable transmission of radio frequency signals according to claim 7, wherein: the specific steps of using the phase comparison component to detect the phase difference in the step 2 are as follows:
s201: an acousto-optic frequency shifter in the phase comparison component shifts the frequency of the reference optical signal and couples the returned transmission optical signal and the frequency-shifted reference optical signal;
s202: respectively filtering out +1 order optical sidebands and-1 order optical sidebands of the coupled transmission optical signal and the frequency shift reference optical signal by using two optical bandpass filters, and respectively detecting by using two photoelectric detectors to obtain two low-frequency signals;
s203: and detecting the phase difference of the two low-frequency electric signals.
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| CN111786726A (en) * | 2020-06-08 | 2020-10-16 | 深圳金信诺高新技术股份有限公司 | Radio frequency optical transmission system and method for phase-stable transmission |
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| CN113259007A (en) * | 2021-06-24 | 2021-08-13 | 上海交通大学 | Cascaded optical frequency transfer device and method |
| CN113391136A (en) * | 2021-05-31 | 2021-09-14 | 重庆邮电大学 | Microwave photon frequency measurement device and method based on fixed low-frequency detection |
| CN114826406A (en) * | 2021-05-27 | 2022-07-29 | 中航光电科技股份有限公司 | Ultra-wideband radio frequency optical fiber phase-stabilized transmission system based on magnetic suspension technology |
| CN115102619A (en) * | 2022-07-18 | 2022-09-23 | 中国电子科技集团公司第四十三研究所 | Radio frequency signal self-adaptive optical fiber phase-stable transmission device and method |
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