CN114726443B - 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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- CN114726443B CN114726443B CN202210180267.8A CN202210180267A CN114726443B CN 114726443 B CN114726443 B CN 114726443B CN 202210180267 A CN202210180267 A CN 202210180267A CN 114726443 B CN114726443 B CN 114726443B
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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
- H04B10/501—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 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. The invention realizes the bidirectional stable phase transmission of signals, simultaneously realizes the accurate extraction of the phase error variation by utilizing the time-sharing sampling mode of pulse signals, and combines an effective algorithm to control the delay time of the adjustable optical delay device to realize the compensation of the phase error variation, thereby effectively improving the phase accuracy of the time-frequency stable phase device.
Description
Technical Field
The invention relates to the technical field of microwave photons, in particular to a system, a device and a method for microwave photon bidirectional time-frequency transmission.
Background
The microwave photon time-frequency transmission technology has wide application in the fields of space observation, radio telescope, distributed synthetic aperture radar, foundation passive detection and the like due to the characteristics of long transmission distance, high flexibility, high phase stability and the like. The high synchronization of the frequency and the phase among the stations is realized through a time-frequency transmission system, so that the stations can combine to accurately synthesize and process signals. As the detection distance becomes larger, the accuracy improves, etc., higher requirements are put on the time-frequency synchronization accuracy between distributed system sites.
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 a preferable scheme for time-frequency signal transmission among various stations of a distributed system. However, the phase of the radio frequency signal transmitted in the optical fiber can shake along with external factors such as temperature, vibration and the like, and the change of the signal transmission delay is mainly caused by the change of the length of the optical fiber due to external stress, temperature and other environmental factors. By introducing a phase correction technology, the phase stability of radio frequency signal transmission between different subarrays is improved. The traditional microwave photon time frequency correction technology measures and feeds back the control phase through the phase discrimination branch circuit to compensate the phase change on the transmission main circuit. However, the conventional microwave photon time-frequency correction technology cannot measure the phase fluctuation generated in the phase discrimination branch, so that the phase fluctuation generated in the phase discrimination branch in the correction device cannot be compensated by using the conventional phase correction technology. The traditional microwave photon time-frequency correction technology is difficult to further improve the phase stability of a transmission system, and further causes the fluctuation of the phase of radio frequency signals between stations along with time, so that the phase control precision of the whole system is affected.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and aims to solve the problems that the existing optical fiber time-frequency stable phase transmission device cannot perform phase self correction, the phase accuracy of time-frequency transmission is low and the like.
The invention aims at realizing 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.
Further, the phase stabilization compensation device builds a correction branch by using the light reflector at the near end, and measures delay jitter and phase change of a signal link in the phase stabilization compensation device by using a test result of the light reflector at the near end; by means of the method of compensating the delay difference between the main circuit correction signal and the branch circuit correction signal, the influence of delay jitter and phase change of the signal link in the phase stabilizing compensation device on the main circuit correction is deducted in the compensation process of the main circuit correction, and the phase error caused by the signal link in the system is 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 delay device, an optical filter and an optical reflector; the core processor generates a pulse correction signal, then the pulse correction signal enters the laser to be converted into a pulse correction optical signal, and the correction optical signal enters the optical power divider to be divided into two paths after passing through the optical circulator and the optical wavelength division multiplexer, namely a branch correction optical signal and a main correction optical signal; the branch correction optical signals return through the first optical reflector, enter the photoelectric detector through the optical circulator, are converted into pulse electric signals, and enter the core processor; the main path correction optical signal enters an optical fiber through an optical adjustable delay device and is transmitted to a far-end electro-optical mutual conversion system, and then returns to a photoelectric detector through a second light reflector to be converted into an electric signal, and then enters a core processor; the amount of delay of the optically tunable optical delay is adjusted by the core processor.
Further, the far-end electro-optical mutual conversion system has a function of returning the main-path correction light transmitted through the optical fiber to the optical fiber.
Further, a dual-time difference correction module is arranged on the core processor, the dual-time difference correction module of the core processor monitors a echo optical pulse signal in real time by utilizing a photoelectric detector and converts the echo optical pulse signal into an electric pulse signal, the receiving time t1 from the self-emission of a first group of return signals, namely branch correction signals, to the return signals is recorded, and the receiving time t2 from the self-emission of a second group of return signals, namely main correction signals, to the return signals is recorded; calculating the time t= (t 2-t 1)/2 to be corrected, and adjusting the delay amount of the optical adjustable delay device by a core processor, wherein the optical delay adjustment amount is-t, and compensating the phase change, so that the overall delay stability of the signal light transmission in the optical fiber in the whole optical transmission process is realized.
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 delay device, 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 inter-conversion 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 divider 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 to the electric 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: setting up a correction branch by using a light reflector at a near end, and measuring delay jitter and phase change of a signal link in the phase stabilization compensation device by using a test result of the light reflector at the near end; by means of the method of compensating the delay difference between the main circuit correction signal and the branch circuit correction signal, the influence of delay jitter and phase change in the phase stabilizing compensation device on the main circuit correction is deducted in the compensation process of the main circuit correction, and the phase error caused by the signal link in the system is eliminated.
Further, the flow of the branch correction signal of the correction branch is as follows: the core processor generates an electric pulse signal, the laser performs electro-optic conversion to an optical pulse signal, the optical pulse signal is input by an A port and output by a B port of the optical circulator, the optical wavelength division multiplexer realizes the combination with the main optical signal, the common optical fiber combination transmission is realized, the optical power divider divides the branch correction pulse optical signal, the optical filter filters the impurity, the near-end optical reflector returns, and the optical power divider, the optical wavelength division multiplexer and the B port of the optical circulator input and output by a C port, and the optical power divider, the optical wavelength division multiplexer and the B port of the optical circulator enter the photoelectric detector to perform photoelectric conversion to the branch correction pulse signal, and the branch correction pulse signal enters the core processor.
Further, the main path correcting optical signal comprises the following steps: the core processor generates an electric pulse signal, the laser performs electro-optic conversion to an optical pulse signal, the optical pulse signal is input by an A port of the optical circulator and output by a B port, the optical wavelength division multiplexer realizes the combination with a main optical signal, realizes the common optical fiber combination transmission, divides the main correction pulse optical signal through the optical power divider, returns the correction pulse optical signal after transmitting to a light reflector at the far end, and respectively inputs and outputs the correction pulse optical signal through the optical power divider, the optical wavelength division multiplexer and the B port of the optical circulator, and then enters the optical detector to be converted into a main correction pulse electric signal and then enters the core processor.
Further, the core processor is provided with a double-time difference correction algorithm, which is used for executing the following procedures: the core processor monitors echo electric pulse signals in real time by utilizing a photoelectric detector, records the receiving time t1 from the self-emission of a first group of return signals, namely branch correction signals, to the return signals, and records the receiving time t2 from the self-emission of a second group of return signals, namely main correction signals, to the return signals; calculating the time t= (t 2-t 1)/2 to be corrected, and adjusting the delay amount of the optical adjustable 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 implemented in the form of a software program and stored in a readable storage medium, and is implemented by a core processor running load.
The beneficial effects of the invention include:
the system can be used for realizing the remote high-phase stability transmission of radio frequency signals in a distributed array system, and compared with a traditional time-frequency transmission system without a self-correction device, the system can eliminate phase errors caused by signal links in the system in the remote time-frequency signal transmission process of the signals, ensure the phase stability of a main light path, realize the high-precision transmission of the signals, and has more abundant application compared with the traditional unidirectional stable-phase transmission system.
In the embodiment of the invention, the light reflector at the near end is used for building a correction branch, the test result of the light reflector at the near end is used for measuring the delay jitter and the phase change of the signal link in the stable phase compensation system, and the defect that the traditional technology cannot detect the phase change on the phase discrimination branch is overcome.
In the embodiment of the invention, the delay difference between the main correction optical signal and the branch correction optical signal is compensated, so that the influence of delay jitter and phase change of an internal signal link of a stable phase compensation system on the main correction is deducted in the compensation process of the main correction, the phase error caused by the internal signal link of the system is eliminated, the precision of the signal in the long-distance time-frequency signal transmission process on the main correction is further improved, the phase stability of the main optical path is improved, and the high-precision transmission of the signal is realized.
In the embodiment of the invention, the photoelectric interconversion modules are used at the near end and the far end, so that bidirectional stable phase transmission is realized under the condition of using only one calibration control, and compared with the traditional unidirectional stable phase transmission system, the bidirectional stable phase transmission system is more abundant in application.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
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;
FIG. 2 is a software workflow diagram of a microwave photon bidirectional time-frequency transmission system based on dual time difference 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 photoelectric detector 203, an optical circulator 204, an optical wavelength division multiplexer 205, an optical power divider 206, an optical tunable delay 207, an optical filter 208 and an optical reflector 209 are shown.
The phase stabilization compensation device is a self-naming term.
Detailed Description
All of the features disclosed in all of the embodiments of this specification, or all of the steps in any method or process disclosed implicitly, except for the mutually exclusive features and/or steps, may be combined and/or expanded and substituted in any way.
Fig. 1 is a block diagram of a microwave photon bidirectional time-frequency transmission system based on dual time difference correction, which comprises a near-end electro-optical mutual conversion system 1, a phase stabilization 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 the bidirectional transmission of signals, namely, after a near-end electro-optical mutual conversion system converts radio frequency signals into optical-load radio frequency signals, the optical-load radio frequency signals are input into a stable phase compensation device and then transmitted to a far-end electro-optical mutual conversion system through long-distance optical fibers to be converted into radio frequency signals and then output. Meanwhile, the system also supports that the radio frequency signals are converted into optical signals in the far-end electro-optical mutual conversion system, and then are transmitted through long-distance optical fibers, 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 the 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 the 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 divider 206, an optically tunable delay 207, an optical filter 208, and an optical reflector 209. The working flow is as follows: the core processor 201 generates a pulse correction signal, and then 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 divider 206 to be divided into two paths, namely a branch correction optical signal and a main correction optical signal. The branch correction optical signal is converted into a pulse electrical signal back through the proximal optical reflector 209 and into the photodetector 203 through the optical circulator 204, and then into the core processor 201. The main-path correction optical signal enters the long-distance optical fiber 3 through the optical adjustable delay 207 and is transmitted to the far-end electro-optical mutual conversion system 4, and then returns to the photoelectric detector 203 of the phase stabilization compensation device through the light reflector (not shown in the figure) at the far end to be converted into an electric signal, and then enters the core processor 201. The core processor 201 monitors the echo optical pulse signal in real time by using the photodetector 203 and converts the echo optical pulse signal into an electrical pulse signal, records a first set of return signals, i.e., a receiving time t1 from the self-emission of the branch correction optical signal to the return signals, and records a second set of return signals, i.e., a receiving time t2 from the self-emission of the main correction signal to the return signals. The time t= (t 2-t 1)/2 to be corrected is calculated, and the delay amount of the optical tunable optical delay device 207 is adjusted by the core processor 201, and the optical delay adjustment amount is-t, so that the delay change of the whole optical cable, namely the phase change, is compensated, and the whole transmission delay stability of the optical fiber signal light in the whole optical transmission process is realized.
In the embodiment of the invention, in practical application, the working flow of the branch correction optical signal is as follows: the core processor 201 generates an electric pulse signal, the laser 202 performs electro-optic conversion to an optical pulse signal, the optical pulse signal is input by an A port of the optical circulator 204 and output by a B port, the optical wavelength division multiplexer 205 realizes the combination with the main optical signal to realize the common optical fiber combination transmission, the optical power divider 206 divides the branch correction pulse optical signal, the optical filter 208 filters the impurity, the optical pulse signal returns through the optical reflector 209 at the near end, and the optical pulse signal is input by the optical power divider 206, the optical wavelength division multiplexer 205 and the B port of the optical circulator 204 and output by a C port, and enters the core processor 201 after the optical pulse signal enters the optical detector 203 to perform photoelectric conversion to the branch correction pulse signal.
In the embodiment of the invention, when in actual application, the working flow of the main path correction signal is as follows: the core processor 201 generates an electric pulse signal, the laser 202 performs electro-optic conversion to an optical pulse signal, the optical pulse signal is input by an A port of the optical circulator 204 and output by a B port, the optical wavelength division multiplexer 205 realizes the combination with a main optical signal, the common optical fiber combination transmission is realized, the main correction pulse optical signal is separated by the optical power divider 206, the main correction pulse optical signal is transmitted to a far end through a phase stabilizing optical cable, the correction pulse optical signal is returned through a filter and a far-end optical reflector (not shown in the figure), and the correction pulse optical signal is respectively input by a phase stabilizing optical cable, the optical power divider 206, the optical wavelength division multiplexer 205 and the B port of the optical circulator 204 and output by a C port, and is converted into a main correction pulse electrical signal after entering the optical detector 203 and then enters the core processor 201.
In an embodiment of the present invention, in practical application, the laser 202 is configured 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 external modulation laser, etc.
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, where the type of the photodetector 203 may be, but is not limited to, a PIN (Positive-Intrinsic-Negative photodiode) detector, an APD (Avalanche PhotoDiode avalanche photodiode) laser, or the like.
In an 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 field programmable gate array), etc.
In the embodiment of the present invention, during 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 a port of the optical circulator 204, the B port of the optical circulator 204 is connected to the E port of the optical wavelength division multiplexer 205, the D port of the optical wavelength division multiplexer 205 is connected to the output port of the near-end electro-optical inter-conversion system 1, the F port of the optical wavelength division multiplexer 205 is connected to the G port of the optical power divider 206, the H port of the optical power divider 206 is connected to the J port of the optical filter 208, and the K port of the optical filter 208 is connected to the optical reflector 209. The I port of the optical splitter 206 is connected to the L port of the optical tunable retarder 207, and the output port of the optical tunable retarder 207 is connected to the long-distance optical fiber 3. The C port of the optical circulator 204 is connected to the optical input 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 optically adjustable delay 207 for feedback control.
In the embodiment of the invention, during practical application, the core processor 201 is composed of the vibration source and the singlechip, and is used for generating an electric pulse signal, simultaneously completing a real-time signal processing function and controlling the optical adjustable delayer 207 to perform delay control through a feedback control algorithm.
In the embodiment of the invention, in practical application, the laser 202 is set as a direct-tuning laser with a wavelength of 1544.53nm, and is used for providing an optical carrier for a microwave photon bidirectional time-frequency transmission system based on double time difference correction.
In the embodiment of the present invention, in practical application, the photodetector 203 is configured as a PIN-type photodetector, and is used for converting 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 of the a port in the optical circulator 204 is output from the B port, and the input optical signal of the B port is output from the C port.
In the embodiment of the present invention, in practical application, the optical signals input by the D port and the E port in the optical wavelength division multiplexer 205 are output from the F port after being combined, and meanwhile, the process can be performed reversely.
In the embodiment of the present invention, in practical application, the optical signal input by the G port in the optical power divider 206 may output 10% of the optical signal at the H port and 90% of the optical signal at the I port.
In the embodiment of the invention, in practical application, the optical adjustable delayer 207 is in the form of a mechanical adjustable delayer to realize delay compensation.
In an embodiment of the present invention, the optical filter 208 can filter out light waves with a wavelength of not 1544.53nm during practical application.
In an embodiment of the present invention, the light reflector 209 may reflect an input light signal during practical application.
In the embodiment of the present invention, in practical application, the correction electrical pulse signal generated by the core processor 201 is converted into an optical pulse signal through electro-optical conversion by the laser 202 (for example, a direct-tuning laser), then is input from the port a of the circulator 204 and output from the port B, then is input to the end E of the wavelength division multiplexer 205, and meanwhile, the optical signal output by the near-end electro-optical inter-conversion system 1 is input to the end D of the wavelength division multiplexer 205, combined into one optical signal, output from the common end F of the wavelength division multiplexer 205, then is input to the optical power divider 206 to divide into two signals, the branch correction signal is output from the H end (10%) of the optical power divider 206 and enters the branch, clutter (wavelength of not 1544.53 nm) is filtered by the optical filter 208, returns from the branch through the optical reflector 209, sequentially passes through the optical filter 208, the optical power divider 206 and the wavelength division multiplexer 205, then is input from the B port of the circulator and output from the C port, the branch correction optical signal enters the detector 203 to complete photoelectric conversion and conversion into a branch correction pulse electric signal, and finally the branch correction pulse electric signal enters the core processor 201, so that the receiving time t1 of the first group of pulse correction signal echoes reflected by the branch can be obtained. The main correction signal is output from the I end (90%) of the optical power divider 206, then enters the long-distance optical cable, returns to the optical filter and the optical reflector (not shown in the figure) in the far-end electro-optical mutual conversion system 4, sequentially passes through the long-distance optical fiber 3, the optical tunable delay 207, the optical power divider 206 and the wavelength division multiplexer 205, then is input from the B port of the circulator and output from the C port, the main correction optical signal enters the detector 203 to complete photoelectric conversion and conversion into a main correction pulse electric signal, and finally the main correction pulse electric signal enters the core processor 201, so that the receiving time t2 of the second group of pulse correction signal echoes reflected by the main can be obtained.
In the embodiment of the present invention, in practical application, after the receiving time difference of the two pulse correction echo signals is acquired by the core processor 201, the core processor 201 calculates the correction time t= - (t 2-t 1)/2 required by the optical adjustable delayer 207 (VOD), and transmits the information to the optical adjustable delayer 207 through a serial port, and the singlechip adjusts the optical adjustable delayer 207 (VOD) in real time. The time delay of transmitting optical signals between the near-end electro-optical mutual conversion system 1 and the far-end electro-optical mutual conversion system 4 is stable, and further the phase stability of radio frequency signals between the near-end electro-optical mutual conversion system 1 and the far-end electro-optical mutual conversion system 4 is realized.
In the embodiment of the invention, when in practical application, the frequency of a transmitted radio frequency signal is 1.8+/-0.5 GHz, the radio frequency signal is converted into an optical carrier radio frequency signal (the central wavelength is 1557.36nm and the wavelength of a corrected optical signal is avoided) in the near-end electro-optical mutual conversion system 1, 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 and is 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, the high stability of signal time delay is ensured in the transmission process, and the phase stability between the near-end electro-optical mutual conversion system and the far-end electro-optical mutual conversion system is ensured. Meanwhile, the optical carrier radio frequency signal is supported to be converted into the optical carrier radio frequency signal in the far-end electro-optical mutual conversion system 2, and the optical carrier radio frequency signal enters the long-distance optical fiber 3 and the microwave photon bidirectional transmission system 2 based on double time difference correction and then enters the near-end electro-optical mutual conversion system 1 to be converted into the radio frequency signal, so that the phase stability between the near-end electro-optical mutual conversion system and the far-end electro-optical mutual conversion system is ensured.
In addition to the foregoing examples, those skilled in the art will recognize from the foregoing disclosure that other embodiments can be made and in which various features of the embodiments can be interchanged or substituted, and that such modifications and changes can be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. The microwave photon bidirectional time-frequency transmission system is characterized by comprising 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;
the phase stabilization compensation device is characterized in that a correction branch is built by using a light reflector positioned at the near end, and the delay jitter and the phase change of a signal link in the phase stabilization compensation device are measured by using the test result of the light reflector at the near end; in the method, the delay time difference between the main circuit correction signal and the branch circuit correction signal is compensated, so that the influence of delay jitter and phase change of an internal signal link of a phase stabilization compensation device on the main circuit correction is deducted in the compensation process of the main circuit correction, and the phase error brought by the internal signal link of the system is eliminated;
the stable phase 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, a first optical reflector and a second optical reflector;
the core processor generates a pulse correction signal, then the pulse correction signal enters the laser to be converted into a pulse correction optical signal, and the correction optical signal enters the optical power divider to be divided into two paths after passing through the optical circulator and the optical wavelength division multiplexer, namely a branch correction optical signal and a main correction optical signal;
the branch correction optical signals are filtered by an optical filter, returned by a first optical reflector, enter a photoelectric detector after passing through an optical circulator, are converted into pulse electric signals, and enter a core processor;
the main path correction optical signal enters an optical fiber through an optical adjustable delay device and is transmitted to a far-end electro-optical mutual conversion system, and then returns to a photoelectric detector through a second light reflector to be converted into an electric signal, and then enters a core processor;
the core processor adjusts the delay amount of the optical tunable optical delay device;
the dual-time difference correction module of the core processor monitors a echo optical pulse signal in real time by utilizing a photoelectric detector and converts the echo optical pulse signal into an electric pulse signal, records the time t1 from the self-emission of a first group of return signals, namely branch correction signals, to the receiving time t2 from the self-emission of a second group of return signals, namely main correction signals, to the receiving time of the return signals; calculating the time t= (t 2-t 1)/2 to be corrected, and adjusting the delay amount of the optical adjustable delay device by a core processor, wherein the optical delay adjustment amount is-t, and compensating the phase change, so that the overall delay stability of the signal light transmission in the optical fiber in the whole optical transmission process is realized.
2. The system of claim 1, wherein the remote electro-optical mutual conversion system has a function of returning the main-path correction light transmitted through the optical fiber to the optical fiber.
3. The 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 inter-conversion 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 divider 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 to the electric input end of the optical adjustable delayer for feedback control;
the phase stabilization compensation device is characterized in that a correction branch is built by using a light reflector positioned at the near end, and the delay jitter and the phase change of a signal link in the phase stabilization compensation device are measured by using the test result of the light reflector at the near end; in the method, the delay time difference between the main circuit correction signal and the branch circuit correction signal is compensated, so that the influence of delay jitter and phase change of an internal signal link of a phase stabilization compensation device on the main circuit correction is deducted in the compensation process of the main circuit correction, and the phase error brought by the internal signal link of the system is eliminated;
the stable phase 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, a first optical reflector and a second optical reflector;
the core processor generates a pulse correction signal, then the pulse correction signal enters the laser to be converted into a pulse correction optical signal, and the correction optical signal enters the optical power divider to be divided into two paths after passing through the optical circulator and the optical wavelength division multiplexer, namely a branch correction optical signal and a main correction optical signal;
the branch correction optical signals are filtered by an optical filter, returned by a first optical reflector, enter a photoelectric detector after passing through an optical circulator, are converted into pulse electric signals, and enter a core processor;
the main path correction optical signal enters an optical fiber through an optical adjustable delay device and is transmitted to a far-end electro-optical mutual conversion system, and then returns to a photoelectric detector through a second light reflector to be converted into an electric signal, and then enters a core processor;
the core processor adjusts the delay amount of the optical tunable optical delay device;
the dual-time difference correction module of the core processor monitors a echo optical pulse signal in real time by utilizing a photoelectric detector and converts the echo optical pulse signal into an electric pulse signal, records the time t1 from the self-emission of a first group of return signals, namely branch correction signals, to the receiving time t2 from the self-emission of a second group of return signals, namely main correction signals, to the receiving time of the return signals; calculating the time t= (t 2-t 1)/2 to be corrected, and adjusting the delay amount of the optical adjustable delay device by a core processor, wherein the optical delay adjustment amount is-t, and compensating the phase change, so that the overall delay stability of the signal light transmission in the optical fiber in the whole optical transmission process is realized.
4. The method for realizing the microwave photon bidirectional time-frequency transmission system is characterized by comprising the following steps: setting up a correction branch by using a light reflector at a near end, and measuring delay jitter and phase change of a signal link in the phase stabilization compensation device by using a test result of the light reflector at the near end;
in the method, the delay time difference between the main circuit correction signal and the branch circuit correction signal is compensated, so that the influence of delay jitter and phase change in a phase stabilization compensation device on the main circuit correction is deducted in the compensation process of the main circuit correction, and the phase error caused by a signal link in the system is eliminated;
the flow of the branch correction signals of the correction branch is as follows: the core processor generates an electric pulse signal, the laser performs electro-optic conversion to an optical pulse signal, the optical pulse signal is input by an A port and output by a B port of the optical circulator, the optical wavelength division multiplexer realizes the combination with the main optical signal, realizes the common optical fiber combination transmission, divides the branch correction pulse optical signal by the optical power divider, filters the impurity by the optical filter, returns by the near-end optical reflector, and then is input by the optical power divider, the optical wavelength division multiplexer and the B port of the optical circulator and output by a C port, enters the photoelectric detector to perform photoelectric conversion to the branch correction pulse signal, and enters the core processor;
the main path correction signal comprises the following steps: the core processor generates an electric pulse signal, the laser performs electro-optic conversion to an optical pulse signal, the optical pulse signal is input by an A port of the optical circulator and output by a B port, the optical wavelength division multiplexer realizes the combination with a main optical signal, realizes the common optical fiber combination transmission, divides the main correction pulse optical signal through the optical power divider, transmits the main correction pulse optical signal to a light reflector at the far end, returns the correction pulse optical signal, and respectively inputs the correction pulse optical signal through the optical power divider, the optical wavelength division multiplexer and the B port of the optical circulator and outputs the correction pulse optical signal through a C port, and after the correction pulse optical signal enters the optical power divider, the optical power divider and the B port of the optical circulator, the correction pulse optical signal is converted into a main correction pulse electric signal and enters the core processor;
the core processor is provided with a double-time difference correction algorithm, which is used for executing the following procedures:
the core processor monitors echo electric pulse signals in real time by utilizing a photoelectric detector, records the receiving time t1 from the self-emission of a first group of return signals, namely branch correction signals, to the return signals, and records the receiving time t2 from the self-emission of a second group of return signals, namely main correction signals, to the return signals;
calculating the time t= (t 2-t 1)/2 to be corrected, and adjusting the delay amount of the optical adjustable delayer by the core processor, wherein the optical delay adjustment amount is-t, and compensating the phase change.
5. The method according to claim 4, wherein the double time difference correction algorithm is implemented in a software program and stored in a readable storage medium, and executed by a core processor.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299743A (en) * | 2011-09-23 | 2011-12-28 | 中国科学院国家授时中心 | Post-compensation method for transmission time delay during optical fiber time transmission |
| CN103701529A (en) * | 2013-12-09 | 2014-04-02 | 北京邮电大学 | Signal time delay stable transmission method and system of broadband |
| CN103716090A (en) * | 2013-12-09 | 2014-04-09 | 北京邮电大学 | Stable frequency transmission method and system |
| CN112187361A (en) * | 2020-08-21 | 2021-01-05 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Space emission phase-coherent synthesis system based on optical fiber phase-stable transmission |
| CN113114378A (en) * | 2021-04-21 | 2021-07-13 | 中国电子科技集团公司第三十四研究所 | High-precision radio frequency phase stabilization system based on ROF link |
| CN113346950A (en) * | 2021-06-07 | 2021-09-03 | 浙江大学 | Broadband radio frequency signal optical fiber phase-stabilizing transmission system device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4336771A3 (en) * | 2016-08-30 | 2024-06-12 | Finisar Corporation | Bi-directional transceiver with time synchronization |
-
2022
- 2022-02-25 CN CN202210180267.8A patent/CN114726443B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299743A (en) * | 2011-09-23 | 2011-12-28 | 中国科学院国家授时中心 | Post-compensation method for transmission time delay during optical fiber time transmission |
| CN103701529A (en) * | 2013-12-09 | 2014-04-02 | 北京邮电大学 | Signal time delay stable transmission method and system of broadband |
| CN103716090A (en) * | 2013-12-09 | 2014-04-09 | 北京邮电大学 | Stable frequency transmission method and system |
| CN112187361A (en) * | 2020-08-21 | 2021-01-05 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Space emission phase-coherent synthesis system based on optical fiber phase-stable transmission |
| CN113114378A (en) * | 2021-04-21 | 2021-07-13 | 中国电子科技集团公司第三十四研究所 | High-precision radio frequency phase stabilization system based on ROF link |
| CN113346950A (en) * | 2021-06-07 | 2021-09-03 | 浙江大学 | Broadband radio frequency signal optical fiber phase-stabilizing transmission system device |
Non-Patent Citations (3)
| Title |
|---|
| Josef Vojtech等.Simultaneous transmission of accurate time in parallel with stable optical frequency in real fibre network over 612 km.《2015 Optoelectronics Global Conference (OGC)》.2015,全文. * |
| 张岩等.光纤链路高精度时频传输及延迟补偿技术研究.《光学与光电技术》.2021,第1-2页，以及图1. * |
| 梁双有 ; 张健康 ; 李立中 ; .光纤时间传输及相位补偿.时间频率学报.2008,(第02期),全文. * |
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