CN106712886A - Multi-user method for synchronously transmitting optical fiber time frequency and system thereof - Google Patents
Multi-user method for synchronously transmitting optical fiber time frequency and system thereof Download PDFInfo
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- CN106712886A CN106712886A CN201611154795.7A CN201611154795A CN106712886A CN 106712886 A CN106712886 A CN 106712886A CN 201611154795 A CN201611154795 A CN 201611154795A CN 106712886 A CN106712886 A CN 106712886A
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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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- 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
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
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Abstract
The invention discloses a multi-user method for synchronously transmitting optical fiber time frequency and a system thereof. According to the method, only one wavelength channel is occupied; synchronous transmission of time signals and frequency signals, and transmission of time codes are realized in a time division multiplexing mode; and service of supplying time frequency and time codes to multiple remote users by one transmitter at a transmission center is realized in a bus form. According to the method and the system, the high-precision time and frequency transmission is realized; optical fiber resources are saved; device costs are reduced; the service of supplying the time frequency and time codes to multiple remote users by one transmitter at the transmission center is realized; and formation of networking application to optical fiber time frequency transmission is facilitated.
Description
Technical field
The invention belongs to optical fiber time simultaneous techniques field, it is related to optical fiber synchronous method and system, especially a kind of optical fiber
Multi-user method and its system that temporal frequency is transmitted simultaneously.
Background technology
In fields such as Aero-Space, radar synchronization, sophisticated weapons manipulation, high-speed communication, surveies of deep space, all to time signal
Synchronization proposes requirement very high with frequency signal phase synchronization.Current long-wave time service can only achieve the synchronous essence of microsecond
Degree, satellite common vision can only achieve the synchronization accuracy of nanosecond, and even expensive satellite two-way pumping station method can only also reach
To the synchronization accuracy of hundred psecs.Optical fiber time Frequency Transfer method can reach the timing tracking accuracy of 100 psecs, e-19/ days
Frequency Synchronization stability, and equipment price be far below satellite two-way pumping station method, so optical fiber time Frequency Transfer method has
Wide application prospect.
Existing technology is often that optical fiber time transmission and optical fiber Frequency Transfer are realized with two sets of independent equipment, so
Fiber resource that is relatively costly and needing also compares many；Even if real optical fiber time frequency can be realized in a wavelength channel
While transmit, be also often to rest on point-to-point transmission；Also there is the Distributed Multi of optical fiber time or frequency same at present
Step technology, but also tend to the multiple spot transmission of simply single time or frequency.And generally require to realize multiple spot in practical application
Between temporal frequency transmit simultaneously, such as the temporal frequency synchronization between multiple radar fixed stations, the time between multiple observation stations is frequently
Rate synchronization.If realizing multi-site synchronization with point-to-point scheme, it is necessary to which optical fiber time Frequency Transfer is standby in large quantities carries out level
Connection and branch, not only increase many costs, and the process of cascade and branch can introduce error, and multi-stage cascade also has error
Accumulation.
The content of the invention
Shortcoming it is an object of the invention to overcome above-mentioned prior art, there is provided what a kind of optical fiber time frequency was transmitted simultaneously
Multi-user method and its system.
The purpose of the present invention is achieved through the following technical solutions：
Present invention firstly provides the multi-user method that a kind of optical fiber time frequency is transmitted simultaneously, only take up a wavelength and lead to
Road, realizes the synchronous transmission of time signal, frequency signal in a time multiplexed manner, and time-code transmission；With the shape of bus
Formula realizes that an emitter of launching centre provides multiple users in strange land the service of temporal frequency and time-code.
Further, the multi-user method that above optical fiber time frequency is transmitted simultaneously specifically includes following steps：
1) encoder of launching centre by reference time signal, reference frequency signal, time-code, the numbering of active user, hair
The round trip transmission delay value between the heart and active user is hit, is encoded in a time multiplexed manner, formed launching centre and compile
The encoded signal that code device sends；
2) encoded signal of launching centre encoder is converted into optical signal by laser, via the circulator of launching centre
Each user is continuously issued by optical fiber link；
3) optical signal from launching centre is divided into two-way, wherein one by entering beam splitter after the circulator of user terminal
Road is input to photodetector, is converted to electric signal；Another road is input to EDFA；
4) by step 3) in electric signal be converted to by photodetector be divided into two-way, wherein leading up to carrier auxiliary
Device, recovers frequency signal；Another road is input to decoder；
5) by step 4) frequency signal that recovers is divided into two-way, and step 4 is input to all the way) described in decoder；It is another
Road is input to controllable delay；
6) by step 3) in decoder by decoding obtain time signal, time-code, the numbering of active user, launching centre with
Round trip transmission delay value between active user, wherein time signal inputs to step 5) described in controllable delay；Time-code, when
The processor of the numbering of preceding user, the propagation delay time data input between launching centre and active user to user terminal；
7) processor of user terminal is by from step 6) time-code that obtains is directly output to user and uses；
8) processor of user terminal compares the numbering of active user with the numbering of its own, if unanimously, just controlled
The photoswitch of user terminal processed, closes it, will be from step 3) optical signal of the EDFA output circulator that passes through user terminal
Return to launching centre；If inconsistent, the photoswitch of user terminal is just controlled, disconnect it.
9) photodetector of launching centre receives the optical signal returned from active user by circulator, by its turn
Electric signal is changed to, the intervalometer of launching centre is input to；
10) intervalometer of launching centre utilizes the reference time signal and reference frequency signal of launching centre,
To step 9) electric signal changed out of the photodetector processes, and measures coming and going between launching centre and active user
Propagation delay time value, and be entered into step 1) described in encoder；
11) processor of user terminal is according to step 6) it is described decode between the launching centre that obtains and active user come and go
Propagation delay time value, sets controllable delay, when realizing the reference of the time signal and frequency signal of active user and launching centre
Between signal and reference frequency signal synchronization.
Further, above launching centre periodically regularly changes current Customs Assigned Number, to realize in bus
The service of the time, frequency and time-code of all users.
The present invention also proposes a kind of system for realizing the above method：Pass through optical fiber including launching centre and with launching centre
Several user terminals of link connection；The launching centre includes encoder, laser, launching centre circulator, launching centre
Photodetector and intervalometer, the encoder, laser, launching centre circulator, launching centre photodetection
Device and intervalometer are in turn connected into closed circuit, and circulator is connected to user terminal by optical fiber link；The user
End includes user terminal circulator, beam splitter, photoswitch, EDFA, user terminal photodetector, carrier auxiliary device, processor, decoding
Device and controllable delay；The user terminal circulator is connected by optical fiber link with launching centre circulator.
Further, system above in the transmission in the minds of：The input of encoder is connected with reference signal and time code signal；It is described
The output of encoder is connected to the input of laser, and the output of the laser is connected to the input of circulator；The circulator
Output be connected with the input of launching centre photodetector, the output of the launching centre photodetector is connected to time interval
The input of measuring appliance.
Further, the input of above-mentioned intervalometer is also associated with reference signal.
Further, in above-mentioned user terminal, the input of the output connection beam splitter of user terminal circulator；The beam splitter it is defeated
Go out a point two-way, the input of user terminal photodetector is connected to all the way, another road is connected to the input of EDFA, and the EDFA's is defeated
Go out to be connected to the input of photoswitch；The output of the photoswitch is connected to the input of user terminal circulator；The photoswitch it is defeated
Entering end also online has processor；The controllable input for delaying device connects the output of decoder and carrier auxiliary device respectively；It is described
The output of the input connection user terminal photodetector of carrier auxiliary device；The output of the decoder is connected to processor.
The invention has the advantages that：
The present invention using will after the optical signal amplification of launching centre return method, it is ensured that optical signal round-trip delay it is right
Title property, realizes high-precision time and Frequency Transfer；Only take up a wavelength channel, realize time signal, frequency signal
The transmission of synchronously transmission, and time-code, has saved fiber resource, reduces equipment cost, for leading in optical fiber time Frequency Transfer
Popularization and application in letter net have great significance；Realize an emitter of launching centre to many of strange land in the form of bus
Individual user provides the service of temporal frequency and time-code, is easy to constitute the networking application of optical fiber time Frequency Transfer.
Brief description of the drawings
Fig. 1 is the general structure schematic diagram of embodiment；
Fig. 2 is the coded format figure of the encoder of embodiment.
Specific embodiment
Present invention firstly provides the multi-user method that a kind of optical fiber time frequency is transmitted simultaneously, the method only takes up a ripple
Long-channel, realizes the synchronous transmission of time signal, frequency signal in a time multiplexed manner, and time-code transmission；With bus
Form realize that an emitter of launching centre provides multiple users in strange land the service of temporal frequency and time-code.The present invention
Method specifically include following steps：
1) encoder of launching centre by reference time signal, reference frequency signal, time-code, the numbering of active user, hair
The round trip transmission delay value between the heart and active user is hit, is encoded in a time multiplexed manner, formed launching centre and compile
The encoded signal that code device sends；
2) encoded signal of launching centre encoder is converted into optical signal by laser, via the circulator of launching centre
Each user is continuously issued by optical fiber link；
3) optical signal from launching centre is divided into two-way, wherein one by entering beam splitter after the circulator of user terminal
Road is input to photodetector, is converted to electric signal；Another road is input to EDFA；
4) by step 3) in electric signal be converted to by photodetector be divided into two-way, wherein leading up to carrier auxiliary
Device, recovers frequency signal；Another road is input to decoder；
5) by step 4) frequency signal that recovers is divided into two-way, and step 4 is input to all the way) described in decoder；It is another
Road is input to controllable delay；
6) by step 3) in decoder by decoding obtain time signal, time-code, the numbering of active user, launching centre with
Round trip transmission delay value between active user, wherein time signal inputs to step 5) described in controllable delay；Time-code, when
The processor of the numbering of preceding user, the propagation delay time data input between launching centre and active user to user terminal；
7) processor of user terminal is by from step 6) time-code that obtains is directly output to user and uses；
8) processor of user terminal compares the numbering of active user with the numbering of its own, if unanimously, just controlled
The photoswitch of user terminal processed, closes it, will be from step 3) optical signal of the EDFA output circulator that passes through user terminal
Return to launching centre；If inconsistent, the photoswitch of user terminal is just controlled, disconnect it.
9) photodetector of launching centre receives the optical signal returned from active user by circulator, by its turn
Electric signal is changed to, the intervalometer of launching centre is input to；
10) intervalometer of launching centre utilizes the reference time signal and reference frequency signal of launching centre,
To step 9) electric signal changed out of the photodetector processes, and measures coming and going between launching centre and active user
Propagation delay time value, and be entered into step 1) described in encoder；
11) processor of user terminal is according to step 6) it is described decode between the launching centre that obtains and active user come and go
Propagation delay time value, sets controllable delay, when realizing the reference of the time signal and frequency signal of active user and launching centre
Between signal and reference frequency signal synchronization.
12) launching centre periodically regularly changes current Customs Assigned Number, to realize to all users in bus
Time, frequency and time-code service.
In order to realize above method, the present invention also proposes a kind of system, as shown in Figure 1：The system include launching centre with
And several user terminals being connected by optical fiber link with launching centre；The launching centre includes encoder, laser, transmitting
Center annular device, launching centre photodetector and intervalometer, the encoder, laser, launching centre annular
Device, launching centre photodetector and intervalometer are in turn connected into closed circuit, and circulator is connected by optical fiber link
It is connected to user terminal；The user terminal includes user terminal circulator, beam splitter, photoswitch, EDFA, user terminal photodetector, load
Ripple restorer, processor, decoder and controllable delay；The user terminal circulator is by optical fiber link and launching centre annular
Device is connected.In the minds of in the transmission, the input of encoder is connected with reference signal and time code signal；The output connection of the encoder
To the input of laser, the output of the laser is connected to the input of circulator；The output of the circulator is connected with transmitting
Central photodetector is input into, and the output of the launching centre photodetector is connected to the input of intervalometer.Institute
The input for stating intervalometer is also associated with reference signal.In the user terminal, the output connection point of user terminal circulator
The input of beam device；The output of the beam splitter point two-way, is connected to the input of user terminal photodetector, another road connection all the way
To the input of EDFA, the output of the EDFA is connected to the input of photoswitch；The output of the photoswitch is connected to user's end ring
The input of shape device；The input of the photoswitch is also online processor；The controllable input for delaying device connects decoding respectively
The output of device and carrier auxiliary device；The output of the input connection user terminal photodetector of the carrier auxiliary device；The decoding
The output of device is connected to processor.
The present invention is described in further detail with reference to the accompanying drawings and examples：
Fig. 1 is the general structure schematic diagram of embodiment, it is assumed that reference time signal is 1PPS signals, and reference frequency signal is
10MHz signals.Fig. 2 is the coded format figure of the encoder of the present embodiment.
The technology of the embodiment of the present invention is realized being made up of following step：
1st, the encoder of launching centre will be with reference to 1PPS time signals, with reference to 10MHz frequency signals, time-code, active user
Numbering, the round trip transmission delay value between launching centre and active user, encoded in a time multiplexed manner.
2nd, the encoded signal of the encoder described in step 1 is converted to optical signal by laser, via the annular of launching centre
Device continuously issues each user by optical fiber link.
3rd, the optical signal from launching centre is divided into two-way by entering beam splitter after the circulator of user terminal.Wherein one
Road is input to photodetector, is converted to electric signal；Another road is input to EDFA.
4th, electric signal be converted to by photodetector be divided into two-way described in step 3, wherein leading up to carrier auxiliary
Device, recovers 10MHz frequency signals；Another road is input to decoder.
5th, the 10MHz frequency signals that step 4 is recovered, are divided into two-way, and the decoder described in step 4 is input to all the way；Separately
Controllable delay is input to all the way.
6th, the decoder described in step 3 obtains 1PPS time signals, time-code, the numbering of active user, transmitting by decoding
Round trip transmission delay value between center and active user.Wherein 1PPS time signals input to the controllable delay described in step 5
Device；Time-code, the numbering of active user, the propagation delay time data input between launching centre and active user to user terminal treatment
Device.
7th, the processor of user terminal will obtain time-code and be directly output to user to use from decoding described in step 6.
8th, the processor of user terminal compares the numbering of active user with the numbering of its own, if unanimously, just controlled
The photoswitch of user terminal processed, closes it, and the optical signal from EDFA outputs described in step 3 is returned by the circulator of user terminal
Back to launching centre；If inconsistent, the photoswitch of user terminal is just controlled, disconnect it.
9th, the photodetector of launching centre receives the optical signal returned from active user by circulator, by its turn
Electric signal is changed to, the intervalometer of launching centre is input to.
10th, the intervalometer of launching centre utilizes the reference 1PPS time signals of launching centre and refers to 10MHz
Frequency signal, is processed the electric signal that photodetector described in step 9 is changed out, measure launching centre and active user it
Between round trip transmission delay value, and be entered into the encoder described in step 1.
11st, the processor of user terminal decodes coming and going between the launching centre and active user for obtaining according to step 6
Propagation delay time value, sets controllable delay, is achieved that 1PPS time signals and 10MHz frequency signals and the transmitting of active user
The reference 1PPS time signals at center and the synchronization with reference to 10MHz frequency signals.
12nd, launching centre periodically regularly changes current Customs Assigned Number, to realize to all users in bus
Time, frequency and time-code service.
In sum, the present invention realizes high-precision time and Frequency Transfer, has saved fiber resource, reduce equipment into
This, realizes that an emitter of launching centre provides multiple users in strange land the service of temporal frequency and time-code, is easy to composition
The networking application of optical fiber time Frequency Transfer.
Claims (7)
1. a kind of optical fiber time frequency simultaneously transmit multi-user method, it is characterised in that only take up a wavelength channel, with when
The mode of point multiplexing realizes the synchronous transmission of time signal, frequency signal, and time-code transmission；Hair is realized in the form of bus
An emitter for hitting the heart provides multiple users in strange land the service of temporal frequency and time-code.
2. the multi-user method that optical fiber time frequency according to claim 1 is transmitted simultaneously, it is characterised in that specifically include
Following steps：
1) encoder of launching centre is by reference time signal, reference frequency signal, time-code, the numbering of active user, transmitting
Round trip transmission delay value between the heart and active user, is encoded in a time multiplexed manner, forms launching centre encoder
The encoded signal for sending；
2) encoded signal of launching centre encoder is converted into optical signal by laser, the circulator via launching centre passes through
Optical fiber link continuously issues each user；
3) optical signal from launching centre is divided into two-way, wherein defeated all the way by entering beam splitter after the circulator of user terminal
Enter to photodetector, be converted to electric signal；Another road is input to EDFA；
4) by step 3) in electric signal be converted to by photodetector be divided into two-way, it is extensive wherein lead up to carrier auxiliary device
Appear again frequency signal；Another road is input to decoder；
5) by step 4) frequency signal that recovers is divided into two-way, and step 4 is input to all the way) described in decoder；Another road is defeated
Enter to controllable delay；
6) by step 3) in decoder by decoding obtain time signal, time-code, the numbering of active user, launching centre with it is current
Round trip transmission delay value between user, wherein time signal inputs to step 5) described in controllable delay；Time-code, current use
The processor of the numbering at family, the propagation delay time data input between launching centre and active user to user terminal；
7) processor of user terminal is by from step 6) time-code that obtains is directly output to user and uses；
8) processor of user terminal compares the numbering of active user with the numbering of its own, if unanimously, just control is used
The photoswitch at family end, closes it, will be from step 3) optical signal of EDFA output returned by the circulator of user terminal
To launching centre；If inconsistent, the photoswitch of user terminal is just controlled, disconnect it；
9) photodetector of launching centre receives the optical signal returned from active user by circulator, is converted into
Electric signal, is input to the intervalometer of launching centre；
10) intervalometer of launching centre utilizes the reference time signal and reference frequency signal of launching centre, to step
The electric signal that rapid 9) described photodetector is changed out is processed, and measures the round-trip transmission between launching centre and active user
Time delay value, and be entered into step 1) described in encoder；
11) processor of user terminal is according to step 6) round-trip transmission decoded between the launching centre and active user for obtaining
Time delay value, sets controllable delay, realizes that the time signal and frequency signal of active user are believed with the reference time of launching centre
Number and reference frequency signal synchronization.
3. the multi-user method that optical fiber time frequency according to claim 2 is transmitted simultaneously, it is characterised in that launching centre
Periodically regularly change current Customs Assigned Number, to realize time to all users in bus, frequency and time-code
Service.
4. a kind of system for realizing claim 2 methods described, it is characterised in that including launching centre and logical with launching centre
Cross several user terminals of optical fiber link connection；The launching centre includes encoder, laser, launching centre circulator, hair
Penetrate central photodetector and intervalometer, the encoder, laser, launching centre circulator, launching centre light
Electric explorer and intervalometer are in turn connected into closed circuit, and circulator is connected to user terminal by optical fiber link；Institute
Stating user terminal includes user terminal circulator, beam splitter, photoswitch, EDFA, user terminal photodetector, carrier auxiliary device, treatment
Device, decoder and controllable delay；The user terminal circulator is connected by optical fiber link with launching centre circulator.
5. system according to claim 4, it is characterised in that in the minds of in the transmission, the input of encoder is connected with reference
Signal and time code signal；The output of the encoder is connected to the input of laser, and the output of the laser is connected to annular
The input of device；The output of the circulator is connected with the input of launching centre photodetector, the launching centre photodetector
Output be connected to the input of intervalometer.
6. system according to claim 5, it is characterised in that the input of the intervalometer is also associated with reference
Signal.
7. system according to claim 4, it is characterised in that in the user terminal, the output connection of user terminal circulator
The input of beam splitter；The output of the beam splitter point two-way, is connected to the input of user terminal photodetector all the way, and another road connects
The input of EDFA is connected to, the output of the EDFA is connected to the input of photoswitch；The output of the photoswitch is connected to user terminal
The input of circulator；The input of the photoswitch is also online processor；The controllable input for delaying device connects solution respectively
The output of code device and carrier auxiliary device；The output of the input connection user terminal photodetector of the carrier auxiliary device；The solution
The output of code device is connected to processor.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768506A (en) * | 2018-04-08 | 2018-11-06 | 四川泰富地面北斗科技股份有限公司 | A kind of polynary multifrequency common-view mode time service method based on common thresholding |
| CN109274424A (en) * | 2018-10-30 | 2019-01-25 | 中国科学院国家授时中心 | A kind of automatic compensating method of optical fiber time dissemination system and its sagnac effect |
| CN110808790A (en) * | 2019-11-04 | 2020-02-18 | 中国科学院国家授时中心 | Multi-user quantum time synchronization method and system based on time division multiplexing |
| CN111698053A (en) * | 2020-06-16 | 2020-09-22 | 中国科学院国家授时中心 | Optical fiber time frequency transmission system and method using Manchester coding |
| CN112187363A (en) * | 2020-09-18 | 2021-01-05 | 中国科学院上海光学精密机械研究所 | High-precision optical fiber time frequency transmission system and method compatible with Ethernet |
| CN113014315A (en) * | 2021-01-29 | 2021-06-22 | 中国科学院国家授时中心 | Optical fiber time transmission system and method based on source end compensation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070258432A1 (en) * | 2006-05-03 | 2007-11-08 | Samsung Electronics Co.; Ltd | Single wavelength Bi-directional RoF link apparatus for signal transmission in TDD wireless system |
| 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 |
| CN102299742A (en) * | 2011-09-23 | 2011-12-28 | 中国科学院国家授时中心 | Method for coding, modulating, demodulating and decoding optical fiber time transfer |
| CN105739215A (en) * | 2016-02-02 | 2016-07-06 | 上海交通大学 | High-precision bi-directional optical fiber time transmission light amplification method and device |
-
2016
- 2016-12-14 CN CN201611154795.7A patent/CN106712886B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070258432A1 (en) * | 2006-05-03 | 2007-11-08 | Samsung Electronics Co.; Ltd | Single wavelength Bi-directional RoF link apparatus for signal transmission in TDD wireless system |
| 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 |
| CN102299742A (en) * | 2011-09-23 | 2011-12-28 | 中国科学院国家授时中心 | Method for coding, modulating, demodulating and decoding optical fiber time transfer |
| CN105739215A (en) * | 2016-02-02 | 2016-07-06 | 上海交通大学 | High-precision bi-directional optical fiber time transmission light amplification method and device |
Non-Patent Citations (1)
| Title |
|---|
| 刘涛等: "光纤时间频率信号传递研究", 《时间频率学报》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768506A (en) * | 2018-04-08 | 2018-11-06 | 四川泰富地面北斗科技股份有限公司 | A kind of polynary multifrequency common-view mode time service method based on common thresholding |
| CN109274424A (en) * | 2018-10-30 | 2019-01-25 | 中国科学院国家授时中心 | A kind of automatic compensating method of optical fiber time dissemination system and its sagnac effect |
| CN110808790A (en) * | 2019-11-04 | 2020-02-18 | 中国科学院国家授时中心 | Multi-user quantum time synchronization method and system based on time division multiplexing |
| CN110808790B (en) * | 2019-11-04 | 2021-01-12 | 中国科学院国家授时中心 | Multi-user quantum time synchronization method and system based on time division multiplexing |
| CN111698053A (en) * | 2020-06-16 | 2020-09-22 | 中国科学院国家授时中心 | Optical fiber time frequency transmission system and method using Manchester coding |
| CN112187363A (en) * | 2020-09-18 | 2021-01-05 | 中国科学院上海光学精密机械研究所 | High-precision optical fiber time frequency transmission system and method compatible with Ethernet |
| CN113014315A (en) * | 2021-01-29 | 2021-06-22 | 中国科学院国家授时中心 | Optical fiber time transmission system and method based on source end compensation |
| CN113014315B (en) * | 2021-01-29 | 2021-12-17 | 中国科学院国家授时中心 | Optical fiber time transmission system and method based on source end compensation |
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