CN114726443A - Microwave photon bidirectional time-frequency transmission system, device and method - Google Patents
Microwave photon bidirectional time-frequency transmission system, device and method Download PDFInfo
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- CN114726443A CN114726443A CN202210180267.8A CN202210180267A CN114726443A CN 114726443 A CN114726443 A CN 114726443A CN 202210180267 A CN202210180267 A CN 202210180267A CN 114726443 A CN114726443 A CN 114726443A
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- 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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
- H04B10/50577—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the phase of the modulating signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
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Abstract
The invention discloses a microwave photon bidirectional time-frequency transmission system, a device and a method, which belong to the technical field of microwave photons and comprise a near-end electro-optical mutual conversion system, a phase stabilization compensation device, an optical fiber and a far-end electro-optical mutual conversion system, wherein the near-end electro-optical mutual conversion system is connected with the far-end electro-optical mutual conversion system through the phase stabilization compensation device and the optical fiber. The invention realizes the bidirectional phase-stabilizing transmission of signals, realizes the accurate extraction of the phase error variable quantity by utilizing a pulse signal time-sharing sampling mode, and realizes the compensation of the phase error variable quantity by combining an effective algorithm to control the delay time of the adjustable light delayer, thereby effectively improving the phase accuracy of the time-frequency phase-stabilizing device.
Description
Technical Field
The invention relates to the technical field of microwave photons, in particular to a microwave photon bidirectional time-frequency transmission system, a device and a method.
Background
The microwave photon time-frequency transmission technology has the characteristics of long transmission distance, high flexibility, high phase stability and the like, and is widely applied to the fields of space observation, radio telescopes, distributed synthetic aperture radars, foundation passive detection and the like. The high synchronization of frequency and phase between sites is realized by time-frequency transmission system between multiple sites, so that the sites can combine to accurately synthesize and process signals. With the increase of the detection distance, the improvement of the precision and the like, higher requirements are put forward on the time-frequency synchronization precision among the sites of the distributed system.
The optical fiber has the characteristics of light volume, wide frequency band, high flexibility, strong anti-interference capability and the like in long-distance transmission, so that the optical fiber becomes an optimal scheme for time-frequency signal transmission among all sites of a distributed system. However, the phase of the radio frequency signal transmitted in the optical fiber may shake with external factors such as temperature and vibration, and mainly changes the length of the optical fiber due to the environmental factors such as external stress and temperature, thereby resulting in the change of signal transmission delay. By introducing a phase correction technology, the phase stability of radio frequency signal transmission among different sub-arrays is improved. According to the traditional microwave photon time-frequency correction technology, the phase is measured and feedback controlled through a phase discrimination branch circuit, and the phase change on a transmission main circuit is compensated. However, the conventional microwave photon time-frequency correction technology cannot realize measurement on phase fluctuation generated inside the phase demodulation branch, so that the phase fluctuation generated inside the phase demodulation branch in the correction device cannot be compensated by using the conventional phase correction technology. The phase stability of a transmission system is difficult to further improve by the traditional microwave photon time-frequency correction technology, and the phase of radio-frequency signals among stations fluctuates along with time, so that the phase control precision of the whole system is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a microwave photon two-way time-frequency transmission system, a device and a method aiming at the problems that the prior optical fiber time-frequency phase-stabilizing transmission device cannot perform phase self-correction, the phase accuracy of time-frequency transmission is low and the like.
The purpose of the invention is realized by the following scheme:
a microwave photon bidirectional time-frequency transmission system comprises a near-end electro-optical mutual conversion system, a phase-stabilizing compensation device, an optical fiber and a far-end electro-optical mutual conversion system, wherein the near-end electro-optical mutual conversion system is connected with the far-end electro-optical mutual conversion system through the phase-stabilizing compensation device and the optical fiber.
Furthermore, the phase stabilization compensation device uses a light reflector at the near end to build a correction branch, and uses the test result of the near end light reflector to measure the delay jitter and the phase change of the signal link inside the phase stabilization compensation device; by means of compensating the delay difference between the main path correction signal and the branch path correction signal, the influence of delay jitter and phase change of an internal signal link of the phase-stabilizing compensation device on the main path correction is deducted in the compensation process of the main path correction, and phase errors caused by the internal signal link of the system are eliminated.
Further, the phase stabilization compensation device comprises a core processor, a laser, a photoelectric detector, a circulator, an optical wavelength division multiplexer, an optical power divider, an optical adjustable delayer, an optical filter and an optical reflector; the core processor generates a pulse correction signal and then enters the laser to be converted into a pulse correction optical signal, the correction optical signal passes through the optical circulator and the optical wavelength division multiplexer and then enters the optical power divider to be divided into two paths, namely a branch correction optical signal and a main path correction optical signal; the branch correction optical signal returns through the first optical reflector, enters the photoelectric detector through the optical circulator, is converted into a pulse electric signal, and then enters the core processor; the main path correction optical signal enters the optical fiber through the optical adjustable delayer and is transmitted to the far-end electro-optical inter-conversion system, then returns to the photoelectric detector through the second optical reflector and is converted into an electric signal, and then enters the core processor; the amount of delay of the optically tunable optical delay is adjusted by the core processor.
Furthermore, the far-end electro-optical inter-conversion system has a function of returning main path correction light transmitted through the optical fiber to the optical fiber.
Furthermore, the core processor is provided with a double time difference correction module, the double time difference correction module of the core processor uses a photoelectric detector to monitor the echo light pulse signal in real time and convert the echo light pulse signal into an electric pulse signal, records the time t1 from the self-emission of the first group of return signals, namely branch correction signals, to the receiving time of the return signals, and records the time t2 from the self-emission of the second group of return signals, namely main correction signals, to the receiving time of the return signals; and calculating the time t needing to be corrected to be (t2-t1)/2, and adjusting the delay amount of the optical adjustable optical delayer by the core processor, wherein the optical delay adjustment amount is-t, and compensating the phase change, so that the whole transmission delay of the signal light in the optical fiber is stable in the whole optical transmission process.
A phase stabilization compensation device comprises a core processor, a laser, a photoelectric detector, an optical circulator, an optical wavelength division multiplexer, an optical power divider, an optical adjustable delayer, an optical filter and an optical reflector; an output port M of the core processor is connected with an input port of the laser, an optical output port of the laser is connected with an A port of the optical circulator, a B port of the optical circulator is connected with an E port of the optical wavelength division multiplexer, a D port of the optical wavelength division multiplexer is connected with an output port of the near-end electro-optical interconversion system, an F port of the optical wavelength division multiplexer is connected with a G port of the optical power divider, an H port of the optical power divider is connected with a J port of the optical filter, and a K port of the optical filter is connected with the optical reflector; an I port of the optical power splitter is connected with an L port of the optical adjustable delayer, and an output port of the optical adjustable delayer is connected with the long-distance optical fiber; the C port of the optical circulator is connected with the optical input end of the photoelectric detector, and the radio frequency output port of the photoelectric detector is connected with the N port of the core processor; the output end of the core processor is connected with the electrical input end of the optical adjustable delayer for feedback control.
A method for realizing a microwave photon bidirectional time frequency transmission system comprises the following steps: a correction branch is established by using a light reflector positioned at the near end, and the delay jitter and the phase change of an internal signal link of the phase stabilization compensation device are measured by using the test result of the near-end light reflector; by means of compensating the delay difference between the main path correction signal and the branch path correction signal, the influence of delay jitter and phase change inside the phase-stabilizing compensation device on the main path correction is deducted in the main path correction compensation process, and phase errors caused by a signal link inside the system are eliminated.
Further, the flow of the branch correction signal of the correction branch is as follows: the optical power divider, the optical wavelength division multiplexer and the optical circulator are input through the B port and output through the C port, and enter the photoelectric detector to be photoelectrically converted into branch correction electric pulse signals and then enter the core processor.
Further, the flow of the main path correcting optical signal is as follows: the optical fiber laser device comprises a core processor, a laser, an optical circulator, an optical power splitter, a main path correction pulse optical signal, a main path optical signal correction optical signal, a light reflector, an optical power splitter, an optical wavelength division multiplexer, an optical circulator, a main path optical signal correction optical signal, a main path optical signal correction optical signal, a main path optical signal correction optical signal, a main path optical signal, a light signal correction optical signal, a light path light signal, a light path light.
Further, a double moveout correction algorithm is provided at the core processor for executing the following processes: the core processor monitors echo electric pulse signals in real time by using a photoelectric detector, records the receiving time t1 from the self-emission to the return signals of a first group of return signals, namely branch correction signals, and records the receiving time t2 from the self-emission to the return signals of a second group of return signals, namely main correction signals; and calculating the time t needing to be corrected to be (t2-t1)/2, and adjusting the delay amount of the optical adjustable optical delayer by the core processor, wherein the optical delay adjustment amount is-t, and compensating the phase change.
Further, the double-time difference correction algorithm is realized in the form of a software program, is stored in a readable storage medium, and is realized by running and loading a core processor.
The beneficial effects of the invention include:
the invention can be used for realizing the long-distance high-phase stability transmission of radio frequency signals in a distributed array system, and compared with the traditional time-frequency transmission system without a self-correcting device, the system ensures that the phase error caused by a signal link inside the system is eliminated in the long-distance time-frequency signal transmission process of the signals, ensures the phase stability of a main optical path, realizes the high-precision transmission of the signals, and has richer application compared with the traditional one-way phase-stable transmission system.
In the embodiment of the invention, a correction branch is established by using the optical reflector positioned at the near end, and the delay jitter and the phase change of the signal link in the phase stabilization compensation system are measured by using the test result of the near-end optical reflector, so that the defect that the phase change on the phase discrimination branch cannot be detected in the traditional technology is overcome.
In the embodiment of the invention, by compensating the delay difference between the main path correction optical signal and the branch path correction optical signal, the influence of delay jitter and phase change of an internal signal link of a phase-stable compensation system on the main path correction is deducted in the compensation process of the main path correction, the phase error brought by the internal signal link of the system is eliminated, the precision of the signal in the process of transmitting a long-distance time-frequency signal on the main path correction is further improved, the phase stability of the main path is improved, and the high-precision transmission of the signal is realized.
In the embodiment of the invention, the photoelectric conversion modules are used at the near end and the far end, so that bidirectional phase-stabilizing transmission is realized under the condition of only using one calibration control, and the application is richer compared with the traditional unidirectional phase-stabilizing transmission system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a microwave photon bidirectional time-frequency transmission system based on dual-moveout correction according to an embodiment of the present invention;
FIG. 2 is a software flowchart of a microwave photon bidirectional time-frequency transmission system based on dual-moveout correction according to an embodiment of the present invention;
in the figure, a near-end electro-optical mutual conversion system 1, a microwave photon bidirectional transmission system 2 based on double time difference correction, a long-distance optical fiber 3, a far-end electro-optical mutual conversion system 4, a core processor 201, a laser 202, a photodetector 203, an optical circulator 204, an optical wavelength division multiplexer 205, an optical power splitter 206, an optically adjustable delayer 207, an optical filter 208, and an optical reflector 209 are shown.
The phase-stationary compensation means is a self-naming term.
Detailed Description
All features disclosed in all embodiments in this specification, or all methods or process steps implicitly disclosed, may be combined and/or expanded, or substituted, in any way, except for mutually exclusive features and/or steps.
Fig. 1 is a block diagram of a microwave photon bidirectional time-frequency transmission system based on dual-time difference correction according to an embodiment of the present invention, which includes a near-end electro-optical mutual conversion system 1, a phase-stabilized compensation device 2, a long-distance optical fiber 3, and a far-end electro-optical mutual conversion system 4; the phase stabilization compensation device 2 and the far-end electro-optical mutual conversion system 4 are connected through the long-distance optical fiber 3, the near-end electro-optical mutual conversion system 1 is connected with the phase stabilization compensation device 2, the near-end electro-optical mutual conversion system 1 generates a main path optical signal, and the main path optical signal is transmitted to the far-end electro-optical mutual conversion system 4 through the phase stabilization compensation device 2 and the long-distance optical fiber 3. The embodiment of the invention aims to realize bidirectional transmission of signals, namely, a near-end electro-optical mutual conversion system converts radio-frequency signals into optical-carrier radio-frequency signals, inputs the optical-carrier radio-frequency signals into a phase stabilization compensation device, transmits the optical-carrier radio-frequency signals to a far-end electro-optical mutual conversion system through long-distance optical fibers, converts the optical-carrier radio-frequency signals into radio-frequency signals and outputs the radio-frequency signals. Meanwhile, the radio frequency signals are also supported to be converted into optical signals in the far-end electro-optical mutual conversion system, transmitted by long-distance optical fibers and input into the phase stabilization compensation device, and then enter the near-end electro-optical mutual conversion system to be converted into radio frequency signals to be output. In the process of bidirectional radio frequency signal optical transmission, the embodiment of the invention can achieve phase synchronization between the radio frequency signal of the far-end electro-optical mutual conversion system and the radio frequency signal of the near-end electro-optical mutual conversion system.
In an embodiment of the present invention, in practical application, the phase stabilization compensation apparatus 2 includes: a core processor 201, a laser 202, a photodetector 203, an optical circulator 204, an optical wavelength division multiplexer 205, an optical power splitter 206, an optical tunable delay 207, an optical filter 208, and an optical reflector 209. The working process is as follows: the core processor 201 generates a pulse correction signal, and then the pulse correction signal enters the laser 202 to be converted into a pulse correction optical signal, and the correction optical signal passes through the optical circulator 204 and the optical wavelength division multiplexer 205 and then enters the optical power splitter 206 to be divided into two paths, namely a branch correction optical signal and a main path correction optical signal. The branch corrected optical signal is converted into a pulsed electrical signal in returning through the proximal optical reflector 209 and entering the photodetector 203 through the optical circulator 204, and then entering the core processor 201. The main path correction optical signal enters the long-distance optical fiber 3 through the optical adjustable time delay 207, is transmitted to the far-end electro-optical mutual conversion system 4, then returns to the photodetector 203 of the phase stabilization compensation device through a far-end optical reflector (not shown in the figure), is converted into an electrical signal, and then enters the core processor 201. The core processor 201 uses the photodetector 203 to monitor the echo light pulse signal in real time and convert it into an electric pulse signal, records the time t1 from self-emission to reception of the first group of return signals, i.e. the branch path correction light signal, and records the time t2 from self-emission to reception of the second group of return signals, i.e. the main path correction signal. The time t to be corrected is calculated as (t2-t1)/2, and the core processor 201 adjusts the delay amount of the optical tunable delay 207, where the optical delay adjustment amount is-t, so as to compensate the delay variation of the whole optical cable, that is, the phase variation, and thus realize the stable transmission of the optical fiber signal light in the whole optical transmission process.
In the embodiment of the present invention, in practical application, the working flow of the branch correcting optical signal is as follows: the core processor 201 generates an electrical pulse signal, the laser 202 performs electro-optical conversion to the optical pulse signal, the optical pulse signal is input from the port a of the optical circulator 204 and output from the port B, the optical wavelength division multiplexer 205 realizes the multiplexing with the main path optical signal, the common optical fiber combiner transmission is realized, the branch correction pulse optical signal is split by the optical power splitter 206, the optical filter 208 filters out the optical pulse signal, the optical pulse signal is returned by the optical reflector 209 at the near end, the optical pulse signal is input from the ports B of the optical power splitter 206, the optical wavelength division multiplexer 205 and the optical circulator 204 and output from the port C, the optical pulse signal enters the photoelectric detector 203 to be subjected to photoelectric conversion to the branch correction electrical pulse signal, and then the branch correction electrical pulse signal enters the core processor 201.
In the embodiment of the present invention, in practical application, the working flow of the main path correction signal is as follows: an electric pulse signal is generated by the core processor 201, electro-optical conversion is performed by the laser 202 to an optical pulse signal, the optical pulse signal is input from an a port of the optical circulator 204 and output from a B port, wave combination with a main path optical signal is realized by the optical wavelength division multiplexer 205, common fiber combined-path transmission is realized, a main path correction pulse optical signal is divided by the optical power divider 206, the main path correction pulse optical signal is transmitted to a far end through a phase-stabilized optical cable, and then is input through the B ports of the phase-stabilized optical cable, the optical power divider 206, the optical wavelength division multiplexer 205 and the optical circulator 204 and output through a C port respectively after being transmitted to the far end through a filter and an optical reflector (not shown in the figure) positioned at the far end, and enters the photoelectric detector 203 and then is converted into a main path correction pulse electrical signal, and then enters the core processor 201.
In the embodiment of the present invention, in practical application, the laser 202 is used to convert an electrical signal generated by the core processor 201 into an optical signal, and the laser type 202 may be, but is not limited to, a direct modulation laser, an externally modulated laser, and the like.
In an embodiment of the present invention, in practical application, the photodetector 203 is configured to convert a returned optical pulse signal into an electrical pulse signal, and the type of the photodetector 203 may be, but is not limited to, a PIN (Positive-Intrinsic-Negative) detector, an APD (Avalanche PhotoDiode) laser, and the like.
In the embodiment of the present invention, in practical application, the type of the core processor 201 may be, but is not limited to, a single chip microcomputer, an FPGA (Field Programmable Gate Array), and the like.
In the embodiment of the present invention, in practical application, the output port M of the core processor 201 is connected to the input port of the laser 202, the optical output port of the laser 202 is connected to the port a of the optical circulator 204, the port B of the optical circulator 204 is connected to the port E of the optical wavelength division multiplexer 205, the port D of the optical wavelength division multiplexer 205 is connected to the output port of the near-end electro-optical interconversion system 1, the port F of the optical wavelength division multiplexer 205 is connected to the port G of the optical power splitter 206, the port H of the optical power splitter 206 is connected to the port J of the optical filter 208, and the port K of the optical filter 208 is connected to the optical reflector 209. An I port of the optical power splitter 206 is connected to an L port of the optical tunable delay 207, and an output port of the optical tunable delay 207 is connected to the long-distance optical fiber 3. The C port of the optical circulator 204 is connected to the optical input terminal of the photodetector 203, and the rf output port of the photodetector 203 is connected to the N port of the core processor 201. The output of the core processor 201 is connected to the electrical input of the optical adjustable delay 207 for feedback control.
In the embodiment of the present invention, in practical application, the core processor 201 is composed of a local oscillation source and a single chip microcomputer, and is configured to generate an electrical pulse signal, complete a real-time signal processing function, and control the optical adjustable delayer 207 through a feedback control algorithm to perform delay control.
In the embodiment of the present invention, in practical application, the laser 202 is configured as a directly tuned laser with a wavelength of 1544.53nm, and is configured to provide an optical carrier for a microwave photon bidirectional time-frequency transmission system based on dual-moveout correction.
In the embodiment of the present invention, in practical application, the photodetector 203 is configured as a PIN photodetector, and is configured to convert a radio frequency signal from an optical domain to an electrical domain.
In the embodiment of the present invention, in practical application, the input optical signal at the a port in the optical circulator 204 is output from the B port, and the input optical signal at the B port is output from the C port.
In the embodiment of the present invention, in practical application, the optical signals input from the D port and the E port in the optical wavelength division multiplexer 205 are combined and then output from the F port, and meanwhile, the process can be performed in the reverse direction.
In the embodiment of the present invention, in practical application, the optical signal input at the G port of the optical power splitter 206 may output 10% of the optical signal at the H port, and output 90% of the optical signal at the I port.
In the embodiment of the present invention, in practical application, the optical tunable delayer 207 implements delay compensation in the form of a mechanical tunable optical delayer.
In practical applications, the optical filter 208 can filter out light waves with a wavelength other than 1544.53 nm.
In practical applications, the optical reflector 209 may reflect the input optical signal.
In the embodiment of the present invention, in practical application, the electrical pulse correction signal generated by the core processor 201 is converted into an optical pulse signal by an electrical-to-optical conversion performed by a laser 202 (e.g. a direct modulation laser), then input from an a port of the circulator 204 and output from a B port, and then input to an E port of the wavelength division multiplexer 205, while an optical signal output by the near-end electrical-to-optical conversion system 1 is input to a D port of the wavelength division multiplexer 205, combined into a single optical signal, output from a common port F of the wavelength division multiplexer 205, and then input to the optical power splitter 206 to be split into two signals, wherein the branch correction signal is output from an H port (10%) of the optical power splitter 206 to enter a branch, and is filtered by an optical filter 208 to remove noise (wavelength other than 1544.53 nm), returned from the branch by an optical reflector 209, and sequentially passes through the optical filter 208, the optical power splitter 206 and the wavelength division multiplexer 205, then, the branch correction optical signal enters the detector 203 to perform photoelectric conversion and is converted into a branch correction pulse electrical signal, and finally, the branch correction pulse electrical signal enters the core processor 201, so that the receiving time t1 of the first group of pulse correction signal echoes reflected from the branch can be obtained. The main path correction signal is output from the I-end (90%) of the optical power splitter 206, then enters the long-distance optical cable, reaches an optical filter and an optical reflector (not shown) in the far-end electro-optical inter-conversion system 4, returns, sequentially passes through the long-distance optical fiber 3, the optical tunable delayer 207, the optical power splitter 206 and the wavelength division multiplexer 205, is input from the B port of the circulator and is output from the C port, enters the detector 203, completes photoelectric conversion and conversion into a main path correction pulse electrical signal, and finally enters the core processor 201, so that the receiving time t2 of the echo of the second group of pulse correction signals reflected from the main path can be obtained.
In the embodiment of the present invention, in practical application, after acquiring the receiving time difference of the two pulse-corrected echo signals by using the core processor 201, the core processor 201 calculates the correction time t ═ t2-t 1/2 required by the optical adjustable delay 207(VOD), transmits the information to the optical adjustable delay 207 through a serial port, and adjusts the optical adjustable delay 207(VOD) in real time through the single chip microcomputer. By compensating for the time difference, the interference of the internal delay change of the compensation system and the phase jitter on the compensation of the long-distance optical fiber 3 is avoided, the change of the optical transmission time quantum of the long-distance optical fiber 3 caused by the change of the external environment can be more accurately compensated, the delay stability of the optical signal transmission from the near-end electro-optical mutual conversion system 1 to the far-end electro-optical mutual conversion system 4 is realized, and the phase stability of the radio-frequency signal from the near-end electro-optical mutual conversion system 1 to the far-end electro-optical mutual conversion system 4 is further realized.
In the embodiment of the invention, in practical application, the frequency of the transmitted radio-frequency signal is 1.8 ± 0.5GHz, the radio-frequency signal is converted into an optical carrier radio-frequency signal (the central wavelength is 1557.36nm, and the wavelength of the corrected optical signal is avoided) in the near-end electro-optical mutual conversion system 1, and then, the optical carrier radio-frequency signal enters the microwave photon bidirectional time-frequency transmission system 2 based on double time difference correction, enters the long-distance optical fiber 3 to be transmitted to the far-end electro-optical mutual conversion system 4, and is converted into the radio-frequency signal in the far-end electro-optical mutual conversion system 4, so that high stability of signal delay is ensured in the transmission process, and phase stability between the near-end and far-end electro-optical mutual conversion systems is ensured. Meanwhile, the radio-frequency signals are converted into optical carrier radio-frequency signals in the far-end electro-optical interconversion system 2, enter the long-distance optical fiber 3 and the microwave photon bidirectional transmission system 2 based on double time difference correction, and then enter the near-end electro-optical interconversion system 1 to be converted into radio-frequency signals, so that the phase stability between the near-end electro-optical interconversion system and the far-end electro-optical interconversion system is ensured.
Other embodiments than the above examples may be devised by those skilled in the art based on the foregoing disclosure, or by adapting and using knowledge or techniques of the relevant art, and features of various embodiments may be interchanged or substituted and such modifications and variations that may be made by those skilled in the art without departing from the spirit and scope of the present invention are intended to be within the scope of the following claims.
Claims (11)
1. A microwave photon bidirectional time-frequency transmission system is characterized by comprising a near-end electro-optical mutual conversion system, a phase stabilization compensation device, an optical fiber and a far-end electro-optical mutual conversion system, wherein the near-end electro-optical mutual conversion system is connected with the far-end electro-optical mutual conversion system through the phase stabilization compensation device and the optical fiber.
2. The microwave photon bidirectional time-frequency transmission system according to claim 1, wherein the phase stabilization compensation device uses a near-end optical reflector to construct a correction branch, and uses the test result of the near-end optical reflector to measure the delay jitter and the phase change of an internal signal link of the phase stabilization compensation device; by means of compensating the delay difference between the main path correction signal and the branch path correction signal, the influence of delay jitter and phase change of an internal signal link of the phase-stabilizing compensation device on the main path correction is deducted in the compensation process of the main path correction, and phase errors caused by the internal signal link of the system are eliminated.
3. The microwave photonic bidirectional time-frequency transmission system according to claim 2, wherein the phase-stabilizing compensation device comprises a core processor, a laser, a photodetector, a circulator, an optical wavelength division multiplexer, an optical power divider, an optically tunable delay, an optical filter, and an optical reflector;
the core processor generates a pulse correction signal and then enters the laser to be converted into a pulse correction optical signal, the correction optical signal passes through the optical circulator and the optical wavelength division multiplexer and then enters the optical power divider to be divided into two paths, namely a branch correction optical signal and a main path correction optical signal;
the branch correction optical signal returns through the first optical reflector, enters the photoelectric detector through the optical circulator, is converted into a pulse electric signal, and then enters the core processor;
the main path correction optical signal enters the optical fiber through the optical adjustable delayer and is transmitted to the far-end electro-optical interconversion system, then returns to the photoelectric detector through the second optical reflector and is converted into an electric signal, and then enters the core processor;
the amount of delay of the optically tunable optical delay is adjusted by the core processor.
4. The microwave photonic bidirectional time-frequency transmission system according to claim 2, wherein the far-end electro-optical inter-conversion system has a function of returning the main path correction light transmitted through the optical fiber to the optical fiber.
5. The microwave photon bidirectional time-frequency transmission system according to claim 3, wherein the core processor is provided with a double time difference correction module, the double time difference correction module of the core processor uses the photoelectric detector to monitor the echo light pulse signal in real time and convert the echo light pulse signal into an electric pulse signal, records the self-emission time t1 of the first group of return signals, namely branch correction signals, to the receiving time t2 of the second group of return signals, namely main correction signals; and calculating the time t which needs to be corrected (t2-t1)/2, adjusting the delay quantity of the optical adjustable optical delayer by using the core processor, wherein the optical delay adjustment quantity is-t, and compensating the phase change, thereby realizing the stable transmission integral delay of the signal light in the optical fiber in the whole optical transmission process.
6. A phase stabilization compensation device is characterized by comprising a core processor, a laser, a photoelectric detector, an optical circulator, an optical wavelength division multiplexer, an optical power divider, an optical adjustable delayer, an optical filter and an optical reflector; an output port M of the core processor is connected with an input port of the laser, an optical output port of the laser is connected with an A port of the optical circulator, a B port of the optical circulator is connected with an E port of the optical wavelength division multiplexer, a D port of the optical wavelength division multiplexer is connected with an output port of the near-end electro-optical interconversion system, an F port of the optical wavelength division multiplexer is connected with a G port of the optical power divider, an H port of the optical power divider is connected with a J port of the optical filter, and a K port of the optical filter is connected with the optical reflector; the I port of the optical power splitter is connected with the L port of the optical adjustable delayer, and the output port of the optical adjustable delayer is connected with the long-distance optical fiber; the C port of the optical circulator is connected with the optical input end of the photoelectric detector, and the radio frequency output port of the photoelectric detector is connected with the N port of the core processor; the output end of the core processor is connected with the electrical input end of the optical adjustable delayer for feedback control.
7. A method for realizing a microwave photon bidirectional time frequency transmission system is characterized by comprising the following steps: a correction branch is established by using a light reflector positioned at the near end, and the delay jitter and the phase change of an internal signal link of the phase stabilization compensation device are measured by using the test result of the near-end light reflector;
by means of compensating the delay difference between the main path correction signal and the branch path correction signal, the influence of delay jitter and phase change inside the phase-stabilizing compensation device on the main path correction is deducted in the main path correction compensation process, and phase errors caused by a signal link inside the system are eliminated.
8. The method of claim 7, wherein the branch calibration signal of the calibration branch comprises the following steps: the optical power divider, the optical wavelength division multiplexer and the optical circulator are input through the B port and output through the C port, and enter the photoelectric detector to be photoelectrically converted into branch correction electric pulse signals and then enter the core processor.
9. The method according to claim 7 or 8, wherein the main path is used for correcting the optical signal by: the optical fiber laser device comprises a core processor, a laser, an optical circulator, an optical power splitter, a main path correction pulse optical signal, a main path optical signal correction optical signal, a light reflector, an optical power splitter, an optical wavelength division multiplexer, an optical circulator, a main path optical signal correction optical signal, a main path optical signal correction optical signal, a main path optical signal correction optical signal, a main path optical signal, a light signal correction optical signal, a light path light signal, a light path light.
10. The method of claim 9, wherein the core processor is provided with a double-moveout correction algorithm for performing the following steps:
the core processor monitors echo electric pulse signals in real time by using a photoelectric detector, records the receiving time t1 from the self-emission to the return signals of a first group of return signals, namely branch correction signals, and records the receiving time t2 from the self-emission to the return signals of a second group of return signals, namely main correction signals;
and calculating the time t needing to be corrected to be (t2-t1)/2, and adjusting the delay amount of the optical adjustable optical delayer by the core processor, wherein the optical delay adjustment amount is-t, and compensating the phase change.
11. The method of claim 10, wherein the double-moveout correction algorithm is implemented in the form of a software program, stored in a readable storage medium, and implemented by a core processor running load.
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