CN107707306A - A kind of two-way time synchronism apparatus of high-precision optical fiber - Google Patents
A kind of two-way time synchronism apparatus of high-precision optical fiber Download PDFInfo
- Publication number
- CN107707306A CN107707306A CN201710733692.4A CN201710733692A CN107707306A CN 107707306 A CN107707306 A CN 107707306A CN 201710733692 A CN201710733692 A CN 201710733692A CN 107707306 A CN107707306 A CN 107707306A
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency
- module
- microwave
- freuqncy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0075—Arrangements for synchronising receiver with transmitter with photonic or optical means
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Optical Communication System (AREA)
Abstract
This application discloses a kind of high-precision optical fiber bidirectional time synchronism apparatus, solve the problems, such as that precision is limited by bit rate.Described device includes frequency synthesizing module, modulation /demodulation module, microwave frequency-variable module, laser module, photoelectric processing module；Frequency synthesizing module produces clock signal and local oscillation signal according to reference frequency signal；Modulation /demodulation module input clock signal generates the first intermediate-freuqncy signal；Receive the second intermediate-freuqncy signal and carry out pseudo range measurement and carrier phase resolving extraction；The microwave frequency-variable module inputs local oscillation signal, and carrying out frequency conversion to the first intermediate-freuqncy signal generates the first microwave signal；Receive the second microwave signal and carry out frequency conversion the second intermediate-freuqncy signal of generation；First microwave signal is modulated in the output light of local oscillator module by photoelectric processing module, produces optical frequency output signal；Optical frequency input signal is received, the second microwave signal is produced by opto-electronic conversion.The sychronisation of the application can greatly improve optical fiber time synchronous precision while system complexity is reduced.
Description
Technical field
The present invention relates to the communications field, the two-way time synchronism apparatus more particularly to based on fiber link.
Background technology
It is increasingly ripe with opctical frequency standard, the Time synchronization technique based on fiber link obtain more and more extensive concern and
Using.Optical fiber bidirectional Time synchronization technique signal modulation feature is typically all to be based on Pseudo Code Spread Spectrum technology and phase-shift keying (PSK) technology,
The measurement of two places clock correction is realized using pseudo-random code ranging technology.Particularly in recent years, optical fiber bidirectional Time synchronization technique is except extensive
Outside temporal frequency applied to light clock between different experiments room compares, be also applied to satellite navigation, in deep-space detection field not
With the high-precision time synchronized between earth station.
Optical fiber bidirectional clock synchronization system typically only carries out point-to-point time synchronized, and the clock correction completed between two stations is surveyed
Amount.Each station is needed to be equipped with Time Transmission signal handling equipment, laser, electrooptic modulator and photodetector etc., and it is utilized
The symmetry of bi-directional link eliminates the path delay of time, realizes the time difference measurement of picosecond magnitude with this.At Time Transmission signal
The input and output frequency for managing equipment is 70MHz, and microwave signal is modulated in optical frequency by laser and transmitted, in the other end
Opto-electronic conversion is realized by photodetector, the demodulation of signal is then completed by Time Transmission signal handling equipment again, utilizes puppet
Code ranging technology realizes the measurement of two places clock correction.This optical fiber time synchronization system separate devices are more, the connection between equipment
The variation of cable can cause the change of Time Delay of Systems, be unfavorable for the stability of system work；The measurement of this pseudo-random code ranging simultaneously
Precision is limited by bit rate, constrains the further raising of timing tracking accuracy.
The content of the invention
Present invention aims at solving the problems, such as that system poor work stability, precision are limited by bit rate, disclosure is a kind of
High-precision optical fiber bidirectional time synchronism apparatus.
The two-way time synchronism apparatus of a kind of high-precision optical fiber disclosed by the invention, includes frequency synthesizing module, modulation /demodulation
Module, microwave frequency-variable module, laser module, photoelectric processing module；
The frequency synthesizing module, for producing clock signal and local oscillation signal according to reference frequency signal；
The modulation /demodulation module, for inputting the clock signal, generate the first intermediate-freuqncy signal；Receive the second intermediate frequency letter
Number；Carry out pseudo range measurement and carrier phase resolves extraction；
The microwave frequency-variable module, for inputting the local oscillation signal, frequency conversion, generation are carried out to first intermediate-freuqncy signal
First microwave signal；Receive the second microwave signal and carry out frequency conversion, generate the second intermediate-freuqncy signal；
The photoelectric processing module, for first microwave signal to be modulated to the output light of the local oscillator module,
Produce optical frequency output signal；Optical frequency input signal is received, the second microwave signal is produced by opto-electronic conversion.
The embodiment further optimized as apparatus of the present invention, also it is used for comprising main control module, the main control module to institute
State modulation /demodulation module, the difference output control instruction of microwave frequency-variable module.
Preferably, the reference frequency signal is 5MHz or 10MHz frequency signals.It is further preferred that the frequency base
Calibration signal also includes 1pps time signals.
Preferably, first intermediate-freuqncy signal, the second intermediate-freuqncy signal are Pseudo Code Spread Spectrum signal.
Preferably, the clock signal includes integer clock signal and decimal clock signal；
Preferably, the local oscillation signal is L-band signal or C-band signal.
Preferably, the center optical wavelength of the optical frequency output signal and optical frequency output signal is 1550nm.
Above-mentioned at least one technical scheme that the embodiment of the present application uses can reach following beneficial effect：New optical fiber
Two-way time synchronism apparatus, optical fiber time synchronous precision can be greatly improved while system complexity is reduced, avoids surveying
Accuracy of measurement is limited by bit rate.Embodiments herein change traditional fiber clock synchronization system separate devices it is more,
The variation of connecting cable between equipment can cause the change of Time Delay of Systems, be unfavorable for the situation for the stability that system works, and carry
The high stability of system work.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding of the present application, forms the part of the application, this Shen
Schematic description and description please is used to explain the application, does not form the improper restriction to the application.In the accompanying drawings：
Fig. 1 is the optical fiber bidirectional time synchronism apparatus for realizing the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the application clearer, below in conjunction with the application specific embodiment and
Technical scheme is clearly and completely described corresponding accompanying drawing.Obviously, described embodiment is only the application one
Section Example, rather than whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not doing
Go out under the premise of creative work the every other embodiment obtained, belong to the scope of the application protection.
Distinguished with prior art, the sychronisation of prior art is all the pseudo-random code ranging scheme that utilizes, and present invention design
Optical fiber sychronisation split-second precision Frequency Transfer is realized using carrier phase technology.Particularly, on the one hand reduce current
Optical fiber bidirectional clock synchronization system complexity, the stability of lifting system work, on the other hand by being used in being compared in optical fiber
Carrier phase measurement technology and the design of variable carrier wave frequency range, improve the synchronous precision of optical fiber time.
Below in conjunction with accompanying drawing, the technical scheme that each embodiment of the application provides is described in detail.
A kind of two-way time synchronism apparatus of high-precision optical fiber, including：Frequency synthesizing module, microwave frequency-variable module, modulatedemodulate
Mode transfer block, laser module, electric light processing module and main control module.
Frequency synthesizing module different frequency output end is defeated with the reference frequency of microwave frequency-variable module, modulation /demodulation module respectively
Enter end-fire frequency cable connection；The signal output part of the microwave frequency-variable module letter with modulation /demodulation module and photoelectric processing module respectively
Number input is connected with radio-frequency cable；The signal input part of microwave frequency-variable module respectively with modulation /demodulation module, photoelectric processing mould
The signal output part of block is connected with radio-frequency cable；The signal input part of photoelectric processing module and the signal output part of laser module
Optical cable connects；
The embodiment further optimized, modulation /demodulation module also include data message output end, pass through data with main control computer
Bus connects；Modulation /demodulation module also includes control terminal, is connected with main control computer by controlling bus.
As the embodiment further optimized, main control computer is connected by controlling bus with microwave frequency-variable module.
During work, external time frequency reference is that frequency synthesizing module 1 provides 5MHz/10MHz frequency signals, frequency synthesis
Module is by the integer frequency and fractional frequency needed for each working cell in frequency synthesis output system, as each working cell
The clock reference or local oscillation frequency signal of work；Modulation /demodulation module 2 generates the first intermediate-freuqncy signal；As the optimal of the present invention
Embodiment, first intermediate-freuqncy signal is Pseudo Code Spread Spectrum signal, for comparing；By microwave frequency-variable module 3, first intermediate frequency
Signal upconverts to L-band or C-band, i.e. the first microwave signal, for comparing, passes through photoelectric processing module 5 and laser die
The effect of block 4 is modulated to optical frequencies, is then externally exported by optical port.
With said process accordingly, the processing procedure to optical frequency input signal is：Microwave frequency-variable module 3 receives photoelectricity and turned
Change the mold L-band or the C-band microwave signal that block 5 exports, i.e. the second microwave signal, for comparing, during the signal is down-converted to
Frequently, i.e. the second intermediate-freuqncy signal；Modulation /demodulation processing module 2 receives the second intermediate-freuqncy signal obtained by the frequency conversion of microwave frequency-variable module 3；
The second intermediate-freuqncy signal received is demodulated, the resolving of pseudo range measurement and carrier phase information extraction；
Main control module 6 is controlled as the device and data processing centre, on the one hand the working condition of control and monitoring device,
On the other hand the data and remote station communication data resolved to modulation-demodulation signal integrated treatment module 2 are further integrated
Processing, while also the L or C working frequency range of microwave frequency-variable module 3 is controlled.
As highly preferred embodiment of the present invention, outside need provides 5MHz or 10MHz frequency references when the present apparatus works
Signal and the outside 1PPS time signals for carrying out Time transfer receiver, require the homologous coherent of the two signals in principle.Wherein
For 5MHz/10MHz frequency signals by frequency synthesizing module, the instruction issued according to main control computer integrates out L-band or C-band
The local oscillation signal that frequency uses as microwave frequency-variable module, while integer clock signal and small to be also provided for modulation /demodulation module
Number clock signal, and the phase noise performance of the clock signal is had higher requirements；The device needs to receive outside input
1550nm optical frequency input signal, while also can be by 1550nm optical frequency output signals caused by itself.
In an embodiment of the present invention, split-second precision Frequency Transfer, the modulation are realized using carrier phase technology
Demodulation module, which produces, compares signal (i.e. the first intermediate-freuqncy signal), and the signal (the second intermediate-freuqncy signal) at the station of the other side to receiving enters
Row capture, tracking, measurement etc., calculate pseudo range measurement information and carrier phase measurement information, then survey the pseudorange of our station
The measurement data of amount data, carrier phase measurement information and other side station issues main control computer, master control simultaneously by system bus
Computer carries out the calculating that rough error is picked out, clock correction data are carried out after filtering to these data.
It should be noted that how time synchronizing signal enters the system of the present invention, and extract the temporal information of signal.
Such as time signal is when being 1pps signals, by frequency synthesis, into modulation /demodulation module.In modulated terminal, pass through the modulation
Demodulation module, the binding and layout of signal, modulation are all using the time signal to trigger, therefore have contained temporal information in signal；
And in demodulating end, measurement is demodulated to this signal, so that it may extract temporal information.
It should also be noted that, term " comprising ", "comprising" or its any other variant are intended to nonexcludability
Comprising so that process, method, commodity or equipment including a series of elements not only include those key elements, but also wrapping
Include the other element being not expressly set out, or also include for this process, method, commodity or equipment intrinsic want
Element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that wanted including described
Other identical element also be present in the process of element, method, commodity or equipment.
Embodiments herein is the foregoing is only, is not limited to the application.For those skilled in the art
For, the application can have various modifications and variations.All any modifications made within spirit herein and principle, it is equal
Replace, improve etc., it should be included within the scope of claims hereof.
Claims (8)
1. a kind of two-way time synchronism apparatus of high-precision optical fiber, it is characterised in that include frequency synthesizing module, modulatedemodulate mode transfer
Block, microwave frequency-variable module, laser module, photoelectric processing module；
The frequency synthesizing module, for producing clock signal and local oscillation signal according to reference frequency signal；
The modulation /demodulation module, for inputting the clock signal, generate the first intermediate-freuqncy signal；Receive the second intermediate-freuqncy signal；
Carry out pseudo range measurement and carrier phase resolves extraction；
The microwave frequency-variable module, for inputting the local oscillation signal, frequency conversion, generation first are carried out to first intermediate-freuqncy signal
Microwave signal；Receive the second microwave signal and carry out frequency conversion, generate the second intermediate-freuqncy signal；
The photoelectric processing module, for first microwave signal to be modulated to the output light of the local oscillator module, produce
Optical frequency output signal；Optical frequency input signal is received, the second microwave signal is produced by opto-electronic conversion.
2. device as claimed in claim 1, it is characterised in that be also used for comprising main control module, the main control module to the tune
Demodulation module processed, the difference output control instruction of microwave frequency-variable module.
3. device as claimed in claim 1, it is characterised in that the reference frequency signal is 5MHz or 10MHz frequency signals.
4. device as claimed in claim 1, it is characterised in that the reference frequency signal also includes 1pps time signals.
5. device as claimed in claim 1, it is characterised in that first intermediate-freuqncy signal, the second intermediate-freuqncy signal are Pseudo Code Spread Spectrum
Signal.
6. device as claimed in claim 1, it is characterised in that the clock signal includes integer clock signal and decimal clock is believed
Number.
7. device as claimed in claim 1, it is characterised in that the local oscillation signal is L-band signal or C-band signal.
8. device as claimed in claim 1, it is characterised in that the center light wave of the optical frequency output signal and optical frequency output signal
A length of 1550nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710733692.4A CN107707306A (en) | 2017-08-24 | 2017-08-24 | A kind of two-way time synchronism apparatus of high-precision optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710733692.4A CN107707306A (en) | 2017-08-24 | 2017-08-24 | A kind of two-way time synchronism apparatus of high-precision optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107707306A true CN107707306A (en) | 2018-02-16 |
Family
ID=61170304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710733692.4A Pending CN107707306A (en) | 2017-08-24 | 2017-08-24 | A kind of two-way time synchronism apparatus of high-precision optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107707306A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049582A (en) * | 2019-12-17 | 2020-04-21 | 北京无线电计量测试研究所 | Microwave signal real-time synchronization device and method based on microwave photon technology |
| CN113132046A (en) * | 2021-03-25 | 2021-07-16 | 中国电子科技集团公司第五十四研究所 | Common-view time synchronization device and method based on mode-locked optical frequency comb |
| CN113285757A (en) * | 2021-05-18 | 2021-08-20 | 国网上海市电力公司 | Frequency division multiplexing high-precision optical fiber time transmission and system and method |
| CN114035460A (en) * | 2021-10-12 | 2022-02-11 | 中国科学院微电子研究所 | Synchronous control method and device for modulating and demodulating signals |
| CN114640375A (en) * | 2022-03-18 | 2022-06-17 | 北京无线电计量测试研究所 | Modem system for determining clock phase and using method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104168077A (en) * | 2014-07-04 | 2014-11-26 | 上海交通大学 | High accuracy optical fiber bidirectional time comparison method and system |
| CN104506269A (en) * | 2014-12-22 | 2015-04-08 | 上海交通大学 | High-precision optical fiber two-way time transmission method and system based on loopback method |
| US20150163000A1 (en) * | 2013-12-09 | 2015-06-11 | Khalifa University of Science, Technology, and Research | Method and devices for synchronization using linear programming |
| CN104954093A (en) * | 2015-06-29 | 2015-09-30 | 北京无线电计量测试研究所 | High-precision remote time transmission system and method based on optical fibers |
| CN106506106A (en) * | 2016-10-28 | 2017-03-15 | 中国计量科学研究院 | Based on the high-accuracy temporal frequency source that optical fiber time is transmitted |
| CN106533529A (en) * | 2016-09-27 | 2017-03-22 | 北京无线电计量测试研究所 | Modulation and demodulation system and method for two-way time comparison of satellite |
-
2017
- 2017-08-24 CN CN201710733692.4A patent/CN107707306A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150163000A1 (en) * | 2013-12-09 | 2015-06-11 | Khalifa University of Science, Technology, and Research | Method and devices for synchronization using linear programming |
| CN104168077A (en) * | 2014-07-04 | 2014-11-26 | 上海交通大学 | High accuracy optical fiber bidirectional time comparison method and system |
| CN104506269A (en) * | 2014-12-22 | 2015-04-08 | 上海交通大学 | High-precision optical fiber two-way time transmission method and system based on loopback method |
| CN104954093A (en) * | 2015-06-29 | 2015-09-30 | 北京无线电计量测试研究所 | High-precision remote time transmission system and method based on optical fibers |
| CN106533529A (en) * | 2016-09-27 | 2017-03-22 | 北京无线电计量测试研究所 | Modulation and demodulation system and method for two-way time comparison of satellite |
| CN106506106A (en) * | 2016-10-28 | 2017-03-15 | 中国计量科学研究院 | Based on the high-accuracy temporal frequency source that optical fiber time is transmitted |
Non-Patent Citations (1)
| Title |
|---|
| XUEYUN WANG 等: "Two way time comparison via optical fiber at BIRMM", 《2017 JOINT CONFERENCE OF THE EUROPEAN FREQUENCY AND TIME FORUM AND IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM (EFTF/IFCS)》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049582A (en) * | 2019-12-17 | 2020-04-21 | 北京无线电计量测试研究所 | Microwave signal real-time synchronization device and method based on microwave photon technology |
| CN111049582B (en) * | 2019-12-17 | 2021-12-14 | 北京无线电计量测试研究所 | Microwave signal real-time synchronization device and method based on microwave photon technology |
| CN113132046A (en) * | 2021-03-25 | 2021-07-16 | 中国电子科技集团公司第五十四研究所 | Common-view time synchronization device and method based on mode-locked optical frequency comb |
| CN113285757A (en) * | 2021-05-18 | 2021-08-20 | 国网上海市电力公司 | Frequency division multiplexing high-precision optical fiber time transmission and system and method |
| CN113285757B (en) * | 2021-05-18 | 2024-01-30 | 国网上海市电力公司 | Frequency division multiplexing high-precision optical fiber time transmission system and method |
| CN114035460A (en) * | 2021-10-12 | 2022-02-11 | 中国科学院微电子研究所 | Synchronous control method and device for modulating and demodulating signals |
| CN114640375A (en) * | 2022-03-18 | 2022-06-17 | 北京无线电计量测试研究所 | Modem system for determining clock phase and using method |
| CN114640375B (en) * | 2022-03-18 | 2023-12-26 | 北京无线电计量测试研究所 | Clock phase determination modem system and use method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107707306A (en) | A kind of two-way time synchronism apparatus of high-precision optical fiber | |
| CN109039469B (en) | Time-frequency standard signal fusion transmission system and transmission method | |
| CN109873658B (en) | Space-ground integrated measurement and control system | |
| CN106533529B (en) | Satellite two-way time comparison modulation and demodulation system and method | |
| US20050094718A1 (en) | Wideband digital radio with transmit modulation cancellation | |
| CN110069011B (en) | BD and GPS-based optical fiber remote centralized time service system and time service method | |
| CN108242965B (en) | A kind of clock transfer method and relevant device | |
| KR20130085507A (en) | Wireless communication system and method for time synchronization thereof | |
| CN106788704A (en) | The measuring system and method for the less fundamental mode optical fibre intermode time delay based on synchronizing sequence | |
| CN106603158A (en) | High-precision distributed optical fiber frequency transfer method | |
| CN103533632A (en) | Free space frequency signal transmission system based on phase compensation | |
| CN112671470B (en) | Fiber-stabilized radio frequency transmission system and method | |
| CN108282232A (en) | Clock system and method | |
| CN111010235B (en) | Transceiver and optical time-frequency transmission device | |
| CN102201906A (en) | Clock signal processing method and equipment | |
| TWI467931B (en) | Signal transmission apparatus, electronic instrument, reference signal outputting apparatus, communication apparatus, reference signal reception apparatus and signal transmission method | |
| CN115967479B (en) | Clock recovery correction system and method based on digital loop | |
| CA3028361A1 (en) | Optical receiver | |
| JP2015529027A (en) | Data transmission and reception method and data transmission and reception device | |
| US11316656B1 (en) | Time transfer modem | |
| CN102386851B (en) | Master-slave equipment system | |
| CN211606529U (en) | Miniaturized high-sensitivity frequency spectrum monitoring receiver | |
| US7046869B2 (en) | Integrated circuit | |
| CN106230511B (en) | 5G distributed base station antenna rf optical transmission systems | |
| CN106253894A (en) | High stability combination zone time service frequency generates equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180216 |