CN113014315A - Optical fiber time transmission system and method based on source end compensation - Google Patents
Optical fiber time transmission system and method based on source end compensation Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0793—Network aspects, e.g. central monitoring of transmission parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/08—Time-division multiplex systems
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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 system and a method for transmitting optical fiber time based on source end compensation, wherein the system comprises source end equipment, and the source end equipment comprises a variable delayer, a first laser, a voltage-controlled oscillator, a single-pole double-throw switch, a second laser, a first wavelength division multiplexer, a first photoelectric detector, a TDC chip, a phase discriminator and a micro control unit. The invention combines the wavelength division multiplexing and time division multiplexing modes, saves optical fiber and hardware resources to the greatest extent, realizes high-accuracy uninterrupted transmission of time signals, has no influence on the transmission process and the measurement process, has small system additional noise, simple structure, high integration level, easy expansion, large-range application, cost control and economy, provides a new idea for the optical fiber time transmission mode and has important significance for popularization and application of optical fiber time transmission equipment.
Description
Technical Field
The invention belongs to the technical field of time frequency, relates to the field of optical fiber time transmission, and particularly relates to an optical fiber time transmission system and method based on source end compensation.
Background
With the rapid development of the time-frequency field, the demands of the fields of scientific research, navigation positioning, aerospace, power transmission, military safety and the like on the accuracy of time synchronization are continuously improved, high-precision time frequency becomes a vital parameter in national science and technology, economy, military and social life, and how to further improve the accuracy of time signal transmission and how to reduce the cost of time transmission equipment and simplify the structural mode of time transmission becomes an important subject to be researched.
At present, the existing Time transfer technology usually adopts a Time-frequency simultaneous transmission mode to improve the accuracy of a Time signal, or measures link delay through a TDC (Time-to-Digital Converter) Time interval measurement chip with higher resolution to perform accurate compensation, so as to obtain a Time transfer signal with higher accuracy.
However, the time and frequency co-transmission mode usually requires the simultaneous operation of a time source and a frequency source, the working condition is severe, complex coding is required in the transmission process, and multiple modules are required to cooperate to operate and more optical fiber resources are required to be allocated, so that the structure is complex; although the whole time transmission system structure can be simplified by adopting the high-resolution TDC chip, the chip often has non-negligible hardware noise, so that the time transmission signal has bottom noise, the accuracy of the time transmission signal can not be further improved by an additional mode, the cost can be greatly increased by reducing the hardware noise and improving the measurement resolution by adopting a skillful manufacturing process, the requirement on a peripheral hardware circuit is also high, the working condition is severe, after the system works for a long time, the chip faces the aging problem, the accuracy of the time signal transmission can be reduced, the process is irreversible, the manufacturing cost of the chip is high, the replacement cost is high, and the risk of long-term stable work of the system is high.
In summary, a new method and system for optical fiber time transfer is needed.
Disclosure of Invention
The present invention is directed to a system and a method for optical fiber time transmission based on source-end compensation, so as to solve one or more of the above technical problems. The invention combines the wavelength division multiplexing and time division multiplexing modes, saves optical fiber and hardware resources, realizes high-accuracy uninterrupted transmission of time signals, has no influence on the transmission process and the measurement process, and has small additional noise of the system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to an optical fiber time transmission system based on source end compensation, which comprises:
a source device, the source device comprising:
the variable delayer is provided with a first input end, a second input end and an output end, and the first input end of the variable delayer is used for inputting a time signal to be transmitted; the variable delayer is used for carrying out lead-time delay compensation on an input time signal;
a first laser provided with an input end and an output end; the input end of the first laser is connected with the output end of the variable delayer, and the output end of the first laser is used for emitting light with the wavelength of lambda 11The laser signal of (1);
a voltage controlled oscillator provided with a first output terminal and a second output terminal;
the single-pole double-throw switch is provided with a movable end a, a movable end b and a fixed end; the movable end a is connected with the input end of the first laser, and the movable end b is connected with the first output end of the voltage-controlled oscillator;
a second laser having an input and an output; the input end of the second laser is connected with the fixed end of the single-pole double-throw switch, and the output end of the second laser is used for emitting light with the wavelength of lambda2The laser signal of (1);
a first wavelength division multiplexer for receiving the wavelength λ emitted by the first laser1And the second laser emitting wavelength is lambda2And outputting the laser signal; the first wavelength division multiplexer is used for receiving the wavelength lambda fed back by the remote end equipment2And outputting the laser signal;
the first photoelectric detector is used for receiving the wavelength lambda fed back by the remote end equipment output by the first wavelength division multiplexer2The laser signal of (1); the first photoelectric detector is provided with a first output end and a second output end;
the TDC chip is provided with a first input end, a second input end and an output end; the first input end of the TDC chip is connected with the output end of the variable delayer, and the second input end of the TDC chip is connected with the first output end of the first photoelectric detector;
the phase detector is provided with a first input end, a second input end and an output end; a first input end of the phase discriminator is connected with a second output end of the voltage-controlled oscillator, and a second input end of the phase discriminator is connected with a second output end of the first photoelectric detector;
the micro-control unit is provided with a first input end, a second input end, a first output end and a second output end; the first input end of the micro control unit is connected with the output end of the TDC chip, the second input end of the micro control unit is connected with the output end of the phase discriminator, the first output end of the micro control unit is connected with the fixed end of the single-pole double-throw switch, and the second output end of the micro control unit is connected with the second input end of the variable delayer.
In a further improvement of the present invention, the source device further includes:
a circulator for receiving the second laser emission at a wavelength λ2And outputs the laser signal to the first wavelength division multiplexer; the circulator is used for receiving the wavelength lambda fed back by the remote end equipment output by the first wavelength division multiplexer2And outputs the laser signal to the first photodetector.
The invention further improves the method and also comprises the following steps: a remote end device, the remote end device comprising: the second wavelength division multiplexer, the reflecting mirror and the second photoelectric detector;
the second wavelength division multiplexer is used for receiving the wavelength lambda output by the first wavelength division multiplexer1Laser signal and wavelength of lambda2And outputting the laser signal; the second wavelength division multiplexer is used for receiving the wavelength lambda fed back by the reflector2And outputting the laser signal;
the reflector is used for receiving the wavelength lambda output by the second wavelength division multiplexer2Laser signal and feedback output wavelength of lambda2The laser signal of (1);
the second photoelectric detector is used for receiving the wavelength lambda output by the second wavelength division multiplexer1And outputs a time signal.
A further development of the invention is that the first wavelength division multiplexer is connected to the second wavelength division multiplexer via an optical fiber link; wherein the wavelength is λ2Of the laser signal and said wavelength is lambda1The transmission process of the laser signals in the optical fiber link is not influenced mutually.
A further development of the invention is that,
the TDC chip is used for obtaining a time interval T according to two input time signalsd1；
The phase discriminator is used for acquiring a passing signal according to two input frequency signalsPhase difference f after transfusiond；
The micro control unit is used for controlling the phase difference fdObtaining a measurement T of the transmission delay of a time signald2(ii) a The micro control unit is used for controlling the micro control unit according to the time interval Td1And the measured value Td2Calculating to obtain time signal transmission time delay TdSaid time signal transmission delay TdFor lead delay compensation of the variable delayer.
The invention relates to an optical fiber time transmission method based on source end compensation, which is based on the system of the invention and specifically comprises the following steps:
inputting a time signal to a source end device, and carrying out advanced compensation on the time signal by the source end device through a variable delayer to obtain a compensated time signal; inputting the compensated time signal to a first laser with an emission wavelength of lambda1The laser signal of (1); at a wavelength of λ1Is input to a first wavelength division multiplexer for transmitting a laser signal of wavelength lambda over an optical fiber link1The laser signal is output to the remote end equipment;
the micro control unit controls the movable end a of the single-pole double-throw switch to be communicated with the fixed end, the compensated time signal is modulated on a second laser, and the wavelength of the time signal which is transmitted and modulated by the second laser is lambda2The laser signal of (1); the wavelength of the modulated time signal is lambda2Is input to a first wavelength division multiplexer for modulating the wavelength of the time signal to λ by an optical fiber link2The laser signal is output to the remote end equipment; the first wavelength division multiplexer is used for receiving the returned modulated time signal and has the wavelength of lambda2The laser signal is input into a first photoelectric detector, and a returned time signal is obtained through the first photoelectric detector; the TDC chip obtains a time interval T according to the compensated time signal and the returned time signald1；
The micro control unit controls the movable end b of the single-pole double-throw switch to be communicated with the fixed end, the frequency signal output by the voltage-controlled oscillator is modulated on the second laser, and the second laser emits the modulated signalThe wavelength of the frequency signal being made lambda2The laser signal of (1); the wavelength of the modulated frequency signal is lambda2Is input to a first wavelength division multiplexer for modulating the wavelength of the frequency signal to λ by an optical fiber link2The laser signal is output to the remote end equipment; the first wavelength division multiplexer is used for receiving the returned modulated frequency signal and has the wavelength of lambda2The laser signal is input into a first photoelectric detector and is input into the first photoelectric detector, and a returned frequency signal is obtained through the first photoelectric detector; the phase discriminator obtains the phase difference f after the frequency signal is transmitted according to the frequency signal output by the voltage-controlled oscillator and the returned frequency signald；
The micro control unit is used for controlling the phase difference fdObtaining a measurement T of the transmission delay of a time signald2According to the time interval Td1And the measured value Td2Calculating to obtain time signal transmission time delay Td；
The variable delayer transmits the time delay T according to the time signaldAnd performing lead-time delay compensation.
The invention is further improved in that the method specifically comprises the following steps:
the circulator receives the wavelength emitted by the second laser and has the wavelength lambda2And outputs the laser signal to the first wavelength division multiplexer;
the circulator receives the wavelength lambda fed back by the remote end equipment output by the first wavelength division multiplexer2And outputs the laser signal to the first photodetector.
The invention is further improved in that the method specifically comprises the following steps:
the remote end equipment receives the wavelength lambda output by the first wavelength division multiplexer through the second wavelength division multiplexer1The laser signal is output to a second photoelectric detector to obtain an output time signal synchronous with the time signal input by the source end equipment;
the remote end equipment receives the modulated time signal output by the first wavelength division multiplexer through the second wavelength division multiplexer, and the wavelength of the modulated time signal is lambda 22Laser signal ofReflected by the reflector and transmitted back to the second wavelength division multiplexer, and the second wavelength division multiplexer feeds back the modulated time signal with the wavelength of lambda to the first wavelength division multiplexer2The laser signal of (1);
the remote terminal equipment receives the modulated frequency signal output by the first wavelength division multiplexer through the second wavelength division multiplexer, and the wavelength of the modulated frequency signal is lambda2The laser signal is reflected by the reflector and transmitted back to the second wavelength division multiplexer, and the second wavelength division multiplexer feeds back the modulated frequency signal with the wavelength of lambda to the first wavelength division multiplexer2The laser signal of (1).
Compared with the prior art, the invention has the following beneficial effects:
the invention combines the wavelength division multiplexing and time division multiplexing modes, saves optical fiber and hardware resources to the greatest extent, realizes high-accuracy uninterrupted transmission of time signals, has no influence on the transmission process and the measurement process, has small system additional noise, simple structure, high integration level, easy expansion, large-range application, cost control and economy, provides a new idea for the optical fiber time transmission mode and has important significance for popularization and application of optical fiber time transmission equipment. Specifically, the invention adopts the wavelength division multiplexing mode to ensure the direct transmission of time signals, thereby greatly reducing the additional noise in the transmission process; the signal transmission process is uninterrupted, and the transmission process and the measurement process are not influenced mutually; the measurement module adopts a time division multiplexing mode that a TDC measurement chip with low resolution and a frequency signal phase discriminator are matched with each other on the basis of wavelength division multiplexing, rough time delay measurement and fine phase measurement are carried out, high-resolution measurement of link time delay is integrally realized, and then high-accuracy transmission of time signals is realized through accurate advance compensation of a variable delayer inside source end equipment.
In the invention, the TDC chip has no requirement on excessive high precision and measurement range, the measurement range of a common TDC chip is about hundreds of ns to several ms, and the measurement precision is 22ps at most, thus meeting the requirement.
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 are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic diagram of an overall structure of a fiber time transfer system based on source-side compensation according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.
An optical fiber time transfer system based on source terminal compensation according to an embodiment of the present invention includes: a source device, the source device comprising: the variable delayer is provided with a first input end, a second input end and an output end, and the first input end of the variable delayer is used for inputting a time signal to be transmitted; the variable delayer is used for carrying out lead-time delay compensation on an input time signal; a first laser provided with an input end and an output end; the input end of the first laser is connected with the output end of the variable delayer, and the output end of the first laser is used for emitting light with the wavelength of lambda1The laser signal of (1); a voltage controlled oscillator provided with a first output terminal and a second output terminal; the single-pole double-throw switch is provided with a movable end a, a movable end b and a fixed end; the movable end a is connected with the input end of the first laser, and the movable end b is connected with the first output end of the voltage-controlled oscillator; a second laser having an input and an output; the input end of the second laser and the single-pole double-throw switchThe fixed end is connected, and the output end of the second laser is used for emitting light with the wavelength of lambda2The laser signal of (1); a first wavelength division multiplexer for receiving the wavelength λ emitted by the first laser1And the second laser emitting wavelength is lambda2And outputting the laser signal; the first wavelength division multiplexer is used for receiving the wavelength lambda fed back by the remote end equipment2And outputting the laser signal; the first photoelectric detector is used for receiving the wavelength lambda fed back by the remote end equipment output by the first wavelength division multiplexer2The laser signal of (1); the first photoelectric detector is provided with a first output end and a second output end; the TDC chip is provided with a first input end, a second input end and an output end; the first input end of the TDC chip is connected with the output end of the variable delayer, and the second input end of the TDC chip is connected with the first output end of the first photoelectric detector; the phase detector is provided with a first input end, a second input end and an output end; a first input end of the phase discriminator is connected with a second output end of the voltage-controlled oscillator, and a second input end of the phase discriminator is connected with a second output end of the first photoelectric detector; the micro-control unit is provided with a first input end, a second input end, a first output end and a second output end; the first input end of the micro control unit is connected with the output end of the TDC chip, the second input end of the micro control unit is connected with the output end of the phase discriminator, the first output end of the micro control unit is connected with the fixed end of the single-pole double-throw switch, and the second output end of the micro control unit is connected with the second input end of the variable delayer.
In this embodiment of the present invention, the source device further includes: a circulator for receiving the second laser emission at a wavelength λ2And outputs the laser signal to the first wavelength division multiplexer; the circulator is used for receiving the wavelength lambda fed back by the remote end equipment output by the first wavelength division multiplexer2And outputs the laser signal to the first photoelectric deviceAnd a detector.
In the embodiment of the invention, the method further comprises the following steps: a remote end device, the remote end device comprising: the second wavelength division multiplexer, the reflecting mirror and the second photoelectric detector; the second wavelength division multiplexer is used for receiving the wavelength lambda output by the first wavelength division multiplexer1Laser signal and wavelength of lambda2And outputting the laser signal; the second wavelength division multiplexer is used for receiving the wavelength lambda fed back by the reflector2And outputting the laser signal; the reflector is used for receiving the wavelength lambda output by the second wavelength division multiplexer2Laser signal and feedback output wavelength of lambda2The laser signal of (1); the second photoelectric detector is used for receiving the wavelength lambda output by the second wavelength division multiplexer1And outputs a time signal.
The system of the embodiment of the invention combines the wavelength division multiplexing and time division multiplexing modes, saves optical fiber and hardware resources to the greatest extent, realizes high-accuracy uninterrupted transmission of time signals, has no influence on the transmission process and the measurement process, has small additional noise, simple structure, high integration level, easy expansion, large-scale application, cost control and economy, provides a new idea for the optical fiber time transmission mode and has important significance for popularization and application of optical fiber time transmission equipment.
Referring to fig. 1, fig. 1 is a schematic diagram of an overall structure of an embodiment of the invention, assuming that a time signal is a 1PPS signal and a reference frequency signal is a 100MHz signal.
The invention provides a source end compensation-based optical fiber time transmission method, which specifically comprises the following steps:
1. inputting the 1PPS time signal to a source end device, and carrying out advanced compensation on the 1PPS time signal by the source end device through a variable delayer to obtain a 1PPS time signal 1;
2. inputting the 1PPS time signal 1 in the step 1 into a Laser LD1(Laser diode), wherein the wavelength of a Laser signal emitted by an LD1 is lambda1；
3. The wavelength in the step 2 is lambda1Laser signal of (2) is inputted to a wavelength division multiplexer (A)Then the data is transmitted to remote end equipment through an optical fiber link;
4. the remote end equipment receives the wavelength lambda in the step 3 through a wavelength division multiplexer B1The laser signal of (1);
5. the wavelength in the step 4 is lambda1Laser signal of (2) is inputted to the photodetector PDB(Photometer) obtaining the 1PPS time signal synchronously output by the 1PPS time signal in the step 1, so that the transmission of the 1PPS time signal is completed, and the processes from the step 1 to the step 5 are uninterrupted;
6. when a micro control unit MCU (microcontroller Unit) control switch is arranged at the a end, the 1PPS time signal 1 in the step 2 is modulated on the LD2, and the wavelength of the laser signal emitted by the LD2 is lambda2；
7. Step 6, the wavelength of the modulated 1PPS time signal is lambda2After passing through the circulator, the laser signal is input to the wavelength division multiplexer A in the step 3, and then is transmitted to remote end equipment through an optical fiber link; wherein the wavelength of the modulated 1PPS time signal in the step 6 is lambda2And the wavelength of the laser signal in the step 2 is lambda1The laser signals of (2) are not mutually influenced in the transmission process of the optical fiber;
8. the remote end equipment receives the 1PPS time signal modulated in the step 7 through a wavelength division multiplexer B, and the wavelength of the signal is lambda2The laser signal of (1);
9. the wavelength of the modulated 1PPS time signal in the step 8 is lambda2The laser signal is reflected back to the wavelength division multiplexer B after passing through the reflector, and then is transmitted to the source end equipment through the optical fiber link;
10. the wavelength of the modulated 1PPS time signal which is transmitted back in the step 9 and received by the source end equipment through the wavelength division multiplexer A is lambda2After passing through the circulator in step 7, the laser signal is input to the photodetector PDAObtaining a returned 1PPS time signal 1;
11. inputting the 1PPS time signal 1 in the step 1 and the 1PPS time signal 1 returned in the step 10 into a TDC time interval measurement chip together, and roughly measuring the time interval of two 1PPS time signals 1 as Td1；
12. The T in the step 11d1Sending the time delay to the MCU, and finishing the rough measurement of the 1PPS time signal transmission time delay in the step 1 from the step 6 to the step 12 without excessive high precision requirement and excessive measurement range requirement on the TDC; specifically, the invention is a high-accuracy time measurement realized by matching rough measurement and fine measurement, so that the period T of a frequency signal is required to be within the measurement range of a measurement chip, and the measurement accuracy of the measurement chip is only one order of magnitude smaller than T to ensure accurate measurement.
13. When the MCU control switch is arranged at the b terminal, a 100MHz frequency signal output by the VCO of the source terminal equipment is modulated on the LD2, and the wavelength of a laser signal emitted by the LD2 is lambda2；
14. Step 13, the wavelength of the modulated 100MHz frequency signal is lambda2After passing through the circulator, the laser signal is input to the wavelength division multiplexer A in the step 3, and then is transmitted to remote end equipment through an optical fiber link; wherein the wavelength of the modulated 100MHz frequency signal in step 13 is lambda2And the wavelength of the laser signal in the step 2 is lambda1The laser signals of (2) are not mutually influenced in the transmission process of the optical fiber;
15. the remote end equipment receives the signal modulated by the 100MHz frequency in the step 14 through a wavelength division multiplexer B, and the wavelength of the signal is lambda2The laser signal of (1);
16. modulating the 100MHz frequency signal in the step 15 to have the wavelength of lambda2The laser signal is reflected back to the wavelength division multiplexer B after passing through the reflector, and then is transmitted to the source end equipment through the optical fiber link;
17. the source end equipment receives the modulated 100MHz frequency signal transmitted back in the step 16 through the wavelength division multiplexer A, and the wavelength of the modulated 100MHz frequency signal is lambda2After passing through the circulator in step 7, the laser signal is input to the photodetector PDAObtaining a returned 100MHz frequency signal;
18. inputting the 100MHz frequency signal in step 13 and the 100MHz frequency signal returned in step 17 into a phase discriminator together, so that the phase difference of the two 100MHz frequency signals after being transmitted through the optical fiber link is fd；
19. Will be obtained in step 11F is describeddSending the time signal to an MCU (microprogrammed control Unit), and obtaining a fine measurement value T of the transmission delay of the 1PPS time signal in the step 1 after the processing of the MCUd2Wherein
T is the period of the frequency signal, in this embodiment, the period of the 100MHz frequency signal is T ═ 10ns, and steps 13 to 19 complete the fine measurement of the transmission delay of the 1PPS time signal in step 1;
20. MCU for step 11 said Td2And step 19 said Td2The high-precision 1PPS time signal transmission time delay is obtained by calculation
Wherein T is the period of the frequency signal]To round the symbol and according to TdAnd (3) controlling the variable delayer in the step (1) to perform the advance delay compensation, so that a closed loop of the optical fiber time transmission method and system based on the source terminal compensation is completed, and the high-accuracy uninterrupted transmission of the 1PPS time signal is realized.
In summary, the invention combines the wavelength division multiplexing and time division multiplexing modes, saves the optical fiber and hardware resources to the maximum extent, realizes the high-accuracy uninterrupted transmission of the time signal, has no influence on the transmission process and the measurement process, has small additional noise of the system, simple structure, high integration level, easy expansion, large-scale application, cost control and economy, provides a new thought for the optical fiber time transmission mode and has important significance for the popularization and application of the optical fiber time transmission equipment; specifically, the index of the fine measurement of the invention can reach 1 ps.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (8)
1. A fiber optic time transfer system based on source-side compensation, comprising:
a source device, the source device comprising:
the variable delayer is provided with a first input end, a second input end and an output end, and the first input end of the variable delayer is used for inputting a time signal to be transmitted; the variable delayer is used for carrying out lead-time delay compensation on an input time signal;
a first laser provided with an input end and an output end; the input end of the first laser is connected with the output end of the variable delayer, and the output end of the first laser is used for emitting light with the wavelength of lambda1The laser signal of (1);
a voltage controlled oscillator provided with a first output terminal and a second output terminal;
the single-pole double-throw switch is provided with a movable end a, a movable end b and a fixed end; the movable end a is connected with the input end of the first laser, and the movable end b is connected with the first output end of the voltage-controlled oscillator;
a second laser having an input and an output; the input end of the second laser is connected with the fixed end of the single-pole double-throw switch, and the output end of the second laser is used for emitting light with the wavelength of lambda2The laser signal of (1);
a first wavelength division multiplexer for receiving the wavelength λ emitted by the first laser1And the second laser emitting wavelength is lambda2And outputting the laser signal; the first wavelength division multiplexer is used for receiving the wavelength lambda fed back by the remote end equipment2And outputting the laser signal;
the first photoelectric detector is used for receiving the wavelength lambda fed back by the remote end equipment output by the first wavelength division multiplexer2The laser signal of (1); the first photoelectric detector is provided with a first output endAnd a second output terminal;
the TDC chip is provided with a first input end, a second input end and an output end; the first input end of the TDC chip is connected with the output end of the variable delayer, and the second input end of the TDC chip is connected with the first output end of the first photoelectric detector;
the phase detector is provided with a first input end, a second input end and an output end; a first input end of the phase discriminator is connected with a second output end of the voltage-controlled oscillator, and a second input end of the phase discriminator is connected with a second output end of the first photoelectric detector;
the micro-control unit is provided with a first input end, a second input end, a first output end and a second output end; the first input end of the micro control unit is connected with the output end of the TDC chip, the second input end of the micro control unit is connected with the output end of the phase discriminator, the first output end of the micro control unit is connected with the fixed end of the single-pole double-throw switch, and the second output end of the micro control unit is connected with the second input end of the variable delayer.
2. The fiber optic time transfer system based on source terminal compensation of claim 1, wherein the source terminal device further comprises:
a circulator for receiving the second laser emission at a wavelength λ2And outputs the laser signal to the first wavelength division multiplexer; the circulator is used for receiving the wavelength lambda fed back by the remote end equipment output by the first wavelength division multiplexer2And outputs the laser signal to the first photodetector.
3. The fiber optic time transfer system based on source-side compensation of claim 1, further comprising: a remote end device, the remote end device comprising: the second wavelength division multiplexer, the reflecting mirror and the second photoelectric detector;
for the second wavelength division multiplexerThe wavelength of the received first wavelength division multiplexer is lambda1Laser signal and wavelength of lambda2And outputting the laser signal; the second wavelength division multiplexer is used for receiving the wavelength lambda fed back by the reflector2And outputting the laser signal;
the reflector is used for receiving the wavelength lambda output by the second wavelength division multiplexer2Laser signal and feedback output wavelength of lambda2The laser signal of (1);
the second photoelectric detector is used for receiving the wavelength lambda output by the second wavelength division multiplexer1And outputs a time signal.
4. The source-end compensation based optical fiber time transfer system of claim 3, wherein the first wavelength division multiplexer and the second wavelength division multiplexer are connected by an optical fiber link; wherein the wavelength is λ2Of the laser signal and said wavelength is lambda1The transmission process of the laser signals in the optical fiber link is not influenced mutually.
5. The optical fiber time transfer system based on source terminal compensation of claim 1,
the TDC chip is used for obtaining a time interval T according to two input time signalsd1；
The phase discriminator is used for acquiring the phase difference f after transmission according to two input frequency signalsd；
The micro control unit is used for controlling the phase difference fdObtaining a measurement T of the transmission delay of a time signald2(ii) a The micro control unit is used for controlling the micro control unit according to the time interval Td1And the measured value Td2Calculating to obtain time signal transmission time delay TdSaid time signal transmission delay TdFor lead delay compensation of the variable delayer.
6. A method for optical fiber time transfer based on source terminal compensation, characterized in that, based on the system of claim 1, the method specifically includes the following steps:
inputting a time signal to a source end device, and carrying out advanced compensation on the time signal by the source end device through a variable delayer to obtain a compensated time signal; inputting the compensated time signal to a first laser with an emission wavelength of lambda1The laser signal of (1); at a wavelength of λ1Is input to a first wavelength division multiplexer for transmitting a laser signal of wavelength lambda over an optical fiber link1The laser signal is output to the remote end equipment;
the micro control unit controls the movable end a of the single-pole double-throw switch to be communicated with the fixed end, the compensated time signal is modulated on a second laser, and the wavelength of the time signal which is transmitted and modulated by the second laser is lambda2The laser signal of (1); the wavelength of the modulated time signal is lambda2Is input to a first wavelength division multiplexer for modulating the wavelength of the time signal to λ by an optical fiber link2The laser signal is output to the remote end equipment; the first wavelength division multiplexer is used for receiving the returned modulated time signal and has the wavelength of lambda2The laser signal is input into a first photoelectric detector, and a returned time signal is obtained through the first photoelectric detector; the TDC chip obtains a time interval T according to the compensated time signal and the returned time signald1；
The micro control unit controls the movable end b of the single-pole double-throw switch to be communicated with the fixed end, the frequency signal output by the voltage-controlled oscillator is modulated on the second laser, and the wavelength of the frequency signal which is transmitted and modulated by the second laser is lambda2The laser signal of (1); the wavelength of the modulated frequency signal is lambda2Is input to a first wavelength division multiplexer for modulating the wavelength of the frequency signal to λ by an optical fiber link2The laser signal is output to the remote end equipment; the first wavelength division multiplexer is used for receiving the returned modulated frequency signal and has the wavelength of lambda2The laser signal is input into a first photoelectric detector and is input into the first photoelectric detector, and a returned frequency signal is obtained through the first photoelectric detector; the said identificationThe phase difference f of the transmitted frequency signal is obtained by the phase device according to the frequency signal output by the voltage-controlled oscillator and the returned frequency signald；
The micro control unit is used for controlling the phase difference fdObtaining a measurement T of the transmission delay of a time signald2According to the time interval Td1And the measured value Td2Calculating to obtain time signal transmission time delay Td；
The variable delayer transmits the time delay T according to the time signaldAnd performing lead-time delay compensation.
7. The method for optical fiber time transfer based on source-end compensation according to claim 6, wherein the system based on claim 2 specifically includes the following steps:
the circulator receives the wavelength emitted by the second laser and has the wavelength lambda2And outputs the laser signal to the first wavelength division multiplexer;
the circulator receives the wavelength lambda fed back by the remote end equipment output by the first wavelength division multiplexer2And outputs the laser signal to the first photodetector.
8. The method for optical fiber time transfer based on source-end compensation according to claim 6, wherein the system based on claim 3 specifically includes the following steps:
the remote end equipment receives the wavelength lambda output by the first wavelength division multiplexer through the second wavelength division multiplexer1The laser signal is output to a second photoelectric detector to obtain an output time signal synchronous with the time signal input by the source end equipment;
the remote terminal equipment receives the modulated time signal output by the first wavelength division multiplexer through the second wavelength division multiplexer, and the wavelength of the modulated time signal is lambda2The laser signal is reflected by the reflector and transmitted back to the second wavelength division multiplexer, and the second wavelength division multiplexer feeds back the modulated time signal with the wavelength of lambda to the first wavelength division multiplexer2The laser signal of (1);
the remote end equipment is multiplexed by the second wavelength divisionThe wavelength of the modulated frequency signal output by the first wavelength division multiplexer is received by the multiplexer2The laser signal is reflected by the reflector and transmitted back to the second wavelength division multiplexer, and the second wavelength division multiplexer feeds back the modulated frequency signal with the wavelength of lambda to the first wavelength division multiplexer2The laser signal of (1).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113810108A (en) * | 2021-09-14 | 2021-12-17 | 中国科学院国家授时中心 | Double-layer locking time signal purification method and system for optical fiber time transmission |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7346279B1 (en) * | 2002-03-25 | 2008-03-18 | Forster Energy Llc | Optical transceiver using heterodyne detection and a transmitted reference clock |
| CN102340354A (en) * | 2011-09-23 | 2012-02-01 | 中国科学院国家授时中心 | Method for eliminating asymmetrical delay for optical fiber time transmission through wavelength division multiplexing |
| CN106712886A (en) * | 2016-12-14 | 2017-05-24 | 中国科学院国家授时中心 | Multi-user method for synchronously transmitting optical fiber time frequency and system thereof |
| CN107819516A (en) * | 2017-11-24 | 2018-03-20 | 中国电子科技集团公司第四十四研究所 | Multi-channel wide band microwave optical transmission chain transmitting terminal phase stabilizing device |
| WO2018113539A1 (en) * | 2016-12-23 | 2018-06-28 | 华为技术有限公司 | Clock transmission method and related device |
| CN109039469A (en) * | 2018-08-20 | 2018-12-18 | 中国科学院上海光学精密机械研究所 | Time-frequency standard signal merges Transmission system and transmission method |
| CN109302258A (en) * | 2018-12-13 | 2019-02-01 | 中国科学院国家授时中心 | The autocompensation installation and method of time-delay deviation in a kind of transmitting of optical fiber time |
| CN110798279A (en) * | 2019-10-23 | 2020-02-14 | 清华大学 | Timing calibration system |
| CN111698032A (en) * | 2020-06-16 | 2020-09-22 | 中国科学院国家授时中心 | Single-fiber one-way time transmission method and system |
-
2021
- 2021-01-29 CN CN202110128809.2A patent/CN113014315B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7346279B1 (en) * | 2002-03-25 | 2008-03-18 | Forster Energy Llc | Optical transceiver using heterodyne detection and a transmitted reference clock |
| CN102340354A (en) * | 2011-09-23 | 2012-02-01 | 中国科学院国家授时中心 | Method for eliminating asymmetrical delay for optical fiber time transmission through wavelength division multiplexing |
| CN106712886A (en) * | 2016-12-14 | 2017-05-24 | 中国科学院国家授时中心 | Multi-user method for synchronously transmitting optical fiber time frequency and system thereof |
| WO2018113539A1 (en) * | 2016-12-23 | 2018-06-28 | 华为技术有限公司 | Clock transmission method and related device |
| CN107819516A (en) * | 2017-11-24 | 2018-03-20 | 中国电子科技集团公司第四十四研究所 | Multi-channel wide band microwave optical transmission chain transmitting terminal phase stabilizing device |
| CN109039469A (en) * | 2018-08-20 | 2018-12-18 | 中国科学院上海光学精密机械研究所 | Time-frequency standard signal merges Transmission system and transmission method |
| CN109302258A (en) * | 2018-12-13 | 2019-02-01 | 中国科学院国家授时中心 | The autocompensation installation and method of time-delay deviation in a kind of transmitting of optical fiber time |
| CN110798279A (en) * | 2019-10-23 | 2020-02-14 | 清华大学 | Timing calibration system |
| CN111698032A (en) * | 2020-06-16 | 2020-09-22 | 中国科学院国家授时中心 | Single-fiber one-way time transmission method and system |
Non-Patent Citations (2)
| Title |
|---|
| 王灵东等: "基于100km光纤链路的时间和频率同时传递", 《光学学报》 * |
| 陈法喜等: "长距离多站点高精度光纤时间同步", 《物理学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113810108A (en) * | 2021-09-14 | 2021-12-17 | 中国科学院国家授时中心 | Double-layer locking time signal purification method and system for optical fiber time transmission |
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