CN102340354A - Method for eliminating asymmetrical delay for optical fiber time transmission through wavelength division multiplexing - Google Patents
Method for eliminating asymmetrical delay for optical fiber time transmission through wavelength division multiplexing Download PDFInfo
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Abstract
The invention relates to a method for eliminating asymmetrical delay for optical fiber time transmission through wavelength division multiplexing. The method comprises the steps of: measuring a difference of two transmission delay with different wavelengths from a time transmission control end to a user receiving end, measuring a closed-loop transmission delay deltaT from the time transmission control end to the user receiving end, and calculating compensating unidirectional transmission delay from the time transmission control end to the user receiving end. According to the invention, a wavelength division multiplexing technology and two laser devices with different wavelengths are adopted, wherein one optical signal with the wavelength of lambda1 is taken as a main channel for time transmission and used for continuously transmitting time signals to a user end; and the other optical signal with the wavelength lambda2 is taken as an auxiliary channel for time transmission and used for alternatively performing bidirectional transmission, and the alternative transmission time is selected according to environment conditions and precision requirements. According to the invention, time difference measurement is performed at two ends of optical fiber time transmission at the same time, a measurement result is transmitted and calculated, and finally, the asymmetrical delay of different wavelengths is eliminated. The method provided by the invention is also suitable for eliminating the asymmetrical delay of optical fiber bidirectional time transmission.
Description
Technical field
The invention belongs to temporal frequency transmission technique field in the electronic information science, be specifically related to the removing method of the asymmetric delay of optical fiber time transmission wavelength division multiplexing.
Background technology
Temporal frequency delivery applications field in the electronic information science, the optical fiber time transmits and adopts two-way time transmission and two kinds of methods of closed loop transmission delay compensation to realize high precision time synchronization.The optical fiber bidirectional time delivering method owing to carry out simultaneously, can not considered Effect of Environmental and phase drift, and think that the delay in round-trip transmission path equates.The compensation that the optical fiber closed loop transmission postpones is based on and utilizes two-way time transfer method to constitute a closed loop transmission path; Think that equally the delay in round-trip transmission path is identical; Therefore getting propagation delay time half the of closed loop path, is exactly to transmit transmitting terminal from the time to postpone to the one-way transmission of user's receiving terminal.Postpone according to this one-way transmission again, the time signal that is transferred to user's receiving terminal is compensated, realize the synchronous of remote optical fiber time.But when light wave was propagated in optical fiber, owing to exist the dispersion phenomenon of material and waveguide, wavelength optical signals was in same optical fiber, and transmission delay is inequality, has an optical wavelength transmission delay difference.Optical wavelength transmission delay difference is different along with the difference of optical wavelength.The difference of optical wavelength is big, and the transmission delay difference is big, and the difference of optical wavelength is little, and the transmission delay difference is just little.And also there is a variable quantity in the optical wavelength transmission delay differences along with the variation of transmission range, environmental factor.For example, trip path adopts 1310nm commonly used and two wavelength of 1550nm respectively, transmission range 100km, and 10 ℃ of variation of ambient temperature, the optical wavelength transmission delay differences is about 200ns, is about 0.5ns with the variable quantity of ambient temperature.If adopt condensation wave to divide multiplex technique, trip path adopts 1549nm and two wavelength of 1550nm respectively, transmission range or 100km, and 10 ℃ of variations in temperature, the transmission delay difference is about 1.6ns, and variable quantity is 2ps.Therefore; Adopt condensation wave to divide multiplex technique can reduce optical wavelength transmission delay difference;, timing tracking accuracy less to tens kilometers short distances, variations in temperature requires lowly can satisfy, but, timing tracking accuracy big for long distance, variations in temperature requires the higher position to be difficult to satisfy.Simultaneously, condensation wave divides multiplex technique to the having relatively high expectations of laser, and service condition is harsh, and relatively difficulty is promoted in practical application.In the optical fiber bidirectional time delivering method, also adopt two different optical wavelength, the transmission delay that exists the wavelength light chromatic dispersion to cause equally is asymmetric.Therefore, must adopt the corresponding method and the technology that suppresses to eliminate the optical wavelength transmission delay difference and the variable quantity of ambient temperature that optical dispersion causes, remove of the influence of trip path optical transmission delay asymmetry the time transmitting accuracy.
Summary of the invention
Technical problem to be solved by this invention is to overcome the shortcoming that above-mentioned condensation wave divides multiplex technique, a kind of transmission delay symmetry is provided, can eliminates optical wavelength transmission delay difference and the variable quantity of ambient temperature, the optical fiber time of remote optical fiber time synchronized that optical dispersion causes and transmit the removing method of the asymmetric delay of wavelength division multiplexing.
It is made up of following step to solve the problems of the technologies described above the technical scheme that adopted:
1, Measuring Time transmitting control end is to two different wave length transmission delay differences of user's receiving terminal
At time transmitting control end; The 1pps signal that atomic clock is come divides two-way output through the radiofrequency signal of coding demodulator modulation; One the tunnel outputs to laser 1, and another road outputs to laser 2, and laser 1 outputs to wavelength division multiplexer 1 with the light signal that radiofrequency signal is modulated into wavelength X 1; Laser 2 outputs to optics selector switch 1 with the light signal that radiofrequency signal is modulated into wavelength X 2; 1,2 terminations at optics selector switch 1 are logical, and when optics selector switch 1,3 ends broke off, the light signal of wavelength X 2 outputed to wavelength division multiplexer 1; Wavelength division multiplexer 1 is with the light signal of wavelength X 1 and the light signal feed-in optical fiber of wavelength X 2, through the wavelength division multiplexer 2 of Optical Fiber Transmission to user's receiving terminal; Wavelength division multiplexer 2 outputs to optical-electrical converter 1 with the light signal of wavelength X 1; Optical-electrical converter 1 converts the light signal of importing to radiofrequency signal and outputs to demodulating and decoding device 1 and laser 3, and demodulating and decoding device 1 is demodulated to the 1pps signal with radiofrequency signal and outputs to time-interval counter 2; Wavelength division multiplexer 2 outputs to optical switch 2 with the light signal of wavelength X 2; At this moment 1 of optical switch 2,3 terminations are logical; 1,2 ends of optical switch 2 break off; The light signal of wavelength X 2 is outputed to optical-electrical converter 2, and optical-electrical converter 2 converts the light signal of importing to radiofrequency signal and outputs to demodulating and decoding device 2, and demodulating and decoding device 2 is demodulated to the 1pps signal with radiofrequency signal and outputs to time-interval counter 2; 2 pairs of two 1pps signals of time-interval counter carry out time difference measurements, and measurement result is the transmission delay differences Δ t of wavelength X 1 and wavelength X 2 light signals.
Above-mentioned λ 1 light signal and the wave-length coverage of λ 2 light signals are 1550nm or 1331nm universal optical fibre communication band.
2, Measuring Time transmitting control end postpones Δ T to user's receiving terminal closed loop transmission
At user's receiving terminal; Laser 3 outputs to optics selector switch 2 with the light signal that radiofrequency signal is modulated into wavelength X 2; 1,2 terminations of optical switch 2 are logical, and 1,3 ends of optics selector switch 2 break off, and the light signal of wavelength X 2 outputs to wavelength division multiplexer 2; Wavelength division multiplexer 2 bursts the light signal of wavelength X 2 into optical fiber; Through optical fiber the optical return signal of wavelength X 2 is passed to the wavelength division multiplexer 1 of time transmitting control end, wavelength division multiplexer 1 outputs to optics selector switch 1 with the light signal of wavelength X 2, and 1,3 terminations of optical switch 1 are logical; When 1,2 ends of light selector switch 1 break off; The light signal of wavelength X 2 outputs to optical-electrical converter 3, converts radiofrequency signal to through optical-electrical converter 3 and outputs to demodulating and decoding device 3, and demodulating and decoding device 3 demodulates radiofrequency signal the 1pps pps pulse per second signal of passback; The 1pps signal that the 1pps pulse signal of passback and atomic clock come is given time-interval counter 1 simultaneously and is carried out time difference measurements, and measurement result is that time transmitting control end postpones Δ T to user's receiving terminal closed loop transmission.
3, time transmitting control end is to the calculating and the compensation of the delay of user's receiving terminal one-way transmission
Optical signal transmission from time transmitting control end to user's receiving terminal wavelength X 1 postpones to be Δ T
1, the optical signal transmission of wavelength X 2 postpones to be Δ T
2, then
ΔT
2-ΔT
1＝Δt
Δ t is two different wave length asymmetry differences, is the measurement result of time-interval counter 2;
Because laser 2 adopts identical wavelength X 2 with laser 3, therefore
ΔT
1+ΔT
2＝ΔT
Δ T is that time transmitting control end postpones to user's receiving terminal closed loop transmission, is the measurement result of time-interval counter 1.Calculate by following formula:
ΔT-Δt＝(ΔT
1+ΔT
2)-(ΔT
2-ΔT
1)＝2ΔT
1
At time transmitting control end, coding demodulator receives closed loop transmission delayed data Δ T that time-interval counter 1 sends here and from two different wave length asymmetry difference DELTA t that user's receiving terminal transmits, calculates wavelength X 1 transmission delay Δ T
1, eliminated the asymmetric problem of the transmission delay of two different wave lengths, and according to transmission delay Δ T
1Carry out pre-compensating.User's receiving terminal just can obtain and time transmitting control end synchronised.
The optimal wavelength scope of λ 1 light signal of the present invention and λ 2 light signals is 1550nm universal optical fibre communication bands.
The present invention adopts wavelength-division multiplex technique and two kinds of different wavelength of laser devices, and one of them wavelength is the main channel that the light signal of λ 1 transmitted as the time, continuously to user side passing time signal.Another wavelength is the auxiliary channel that the light signal of λ 2 transmitted as the time, the bi-directional that hockets, and the time of alternately transmitting is according to environmental condition, required precision is selected.The present invention carries out time difference measurement simultaneously at the two ends that the optical fiber time transmits, and measurement result is transmitted, and calculates, and is final, eliminates the asymmetric delay of different wave length.The suitable equally optical fiber bidirectional time of this method is transmitted the elimination of asymmetric delay.
Description of drawings
Fig. 1 is the flow chart of the embodiment of the invention 1.
Embodiment
To further explain of the present invention, but the invention is not restricted to these embodiment below in conjunction with accompanying drawing and embodiment.
1, Measuring Time transmitting control end is to two different wave length transmission delay differences of user's receiving terminal
Referring to Fig. 1; At time transmitting control end, the 1pps signal that atomic clock is come divides two-way output through the radiofrequency signal of coding demodulator modulation, and one the tunnel outputs to laser 1; Another road outputs to laser 2; Laser 1 is modulated into wavelength X 1 for the light signal of 1550nm outputs to wavelength division multiplexer 1 with radiofrequency signal, and laser 2 is modulated into wavelength X 2 for the light signal of 1570nm outputs to optics selector switch 1 with radiofrequency signal, and is logical in 1,2 terminations of optics selector switch 1; When optics selector switch 1,3 ends break off; Wavelength X 2 is for the light signal of 1570nm outputs to wavelength division multiplexer 1, and wavelength division multiplexer 1 is that light signal and the wavelength X 2 of 1550nm is the light signal feed-in optical fiber of 1750nm with wavelength X 1, through the wavelength division multiplexer 2 of Optical Fiber Transmission to user's receiving terminal.Wavelength division multiplexer 2 outputs to optical-electrical converter 1 with wavelength X 1 for the light signal of 1550nm; Optical-electrical converter 1 converts the light signal of importing to radiofrequency signal and outputs to demodulating and decoding device 1 and laser 3, and demodulating and decoding device 1 is demodulated to the 1pps signal with radiofrequency signal and outputs to time-interval counter 2.Wavelength division multiplexer 2 outputs to optical switch 2 with wavelength X 2 for the light signal of 1570nm; At this moment 1 of optical switch 2,3 terminations are logical; 1,2 ends of optical switch 2 break off; For the light signal of 1570nm outputs to optical-electrical converter 2, optical-electrical converter 2 converts the light signal of importing to radiofrequency signal and outputs to demodulating and decoding device 2 with wavelength X 2, and demodulating and decoding device 2 is demodulated to the 1pps signal with radiofrequency signal and outputs to time-interval counter 2; 2 pairs of two 1pps signals of time-interval counter carry out time difference measurements, and measurement result is that wavelength X 1 is the transmission delay differences Δ t of 1570nm light signal for 1550nm and wavelength X 2.
2, Measuring Time transmitting control end postpones Δ T to user's receiving terminal closed loop transmission
Referring to Fig. 1; At user's receiving terminal, laser 3 is modulated into wavelength X 2 for the light signal of 1570nm outputs to optics selector switch 2 with radiofrequency signal, and is at this moment that 1,2 terminations of optical switch 2 are logical; When 1,3 ends of optics selector switch 2 break off; Wavelength X 2 is for the light signal of 1570nm outputs to wavelength division multiplexer 2, and wavelength division multiplexer 2 is burst wavelength X 2 into optical fiber for the light signal of 1570nm, wavelength X 2 is passed to the wavelength division multiplexer 1 of time transmitting control end through optical fiber for the 1570nm optical return signal; Wavelength division multiplexer 1 outputs to optics selector switch 1 with wavelength X 2 for the light signal of 1570nm; 1,3 terminations of optical switch 1 are logical, and when 1,2 ends of light selector switch 1 broke off, wavelength X 2 outputed to optical-electrical converter 3 for the light signal of 1570nm; Convert radiofrequency signal to through optical-electrical converter 3 and output to demodulating and decoding device 3; Demodulating and decoding device 3 demodulates the IPPS pps pulse per second signal of passback with radiofrequency signal, and the 1pps signal that the 1pps pulse signal of passback and atomic clock come is given time-interval counter 1 simultaneously and carried out time difference measurements, and measurement result is that time transmitting control end postpones Δ T to user's receiving terminal closed loop transmission.
3, time transmitting control end is to the calculating and the compensation of the delay of user's receiving terminal one-way transmission
The optical signal transmission that from time transmitting control end to user's receiving terminal wavelength X 1 is 1550nm postpones to be Δ T
1, wavelength X 2 postpones to be Δ T for the 1570nm optical signal transmission
2, then
ΔT
2-ΔT
1＝Δt
Δ t is two different wave length asymmetry differences, is the measurement result of time-interval counter 2.
Because laser 2 adopts identical wavelength 1570nm with laser 3, therefore
ΔT
1+ΔT
2＝ΔT
Δ T is that time transmitting control end postpones to user's receiving terminal closed loop transmission, is the measurement result of time-interval counter 1.Calculate by following formula:
ΔT-Δt＝(ΔT
1+ΔT
2)-(ΔT
2-ΔT
1)＝2ΔT
1
At time transmitting control end, coding demodulator receives closed loop transmission delayed data Δ T that time-interval counter 1 sends here and from two different wave length asymmetry difference DELTA t that user's receiving terminal transmits, calculates wavelength X 1 and be 1550nm transmission delay Δ T
1, eliminated the asymmetric problem of the transmission delay of two different wave lengths, and according to transmission delay Δ T
1Carry out pre-compensating.User's receiving terminal just can obtain and time transmitting control end synchronised.
At the Measuring Time transmitting control end of embodiment 1 in two different wave length transmission delay differences of user's receiving terminal step 1; With wavelength X 1 is that the light signal of 1550nm uses the light signal replacement of wavelength X 1 as 1560nm; Wavelength X 2 is that the light signal of 1570nm uses the light signal replacement of wavelength X 2 as 1580nm, and other steps of this step are identical with embodiment 1.Postponing to user's receiving terminal closed loop transmission in the Δ T step 2 at Measuring Time transmitting control end, be that the light signal of 1570nm uses wavelength X 2 to replace as the light signal of 1580nm with wavelength X 2, and other steps of this step are identical with embodiment 1.In calculating and compensation process 3 that time transmitting control end postpones to user's receiving terminal one-way transmission; With wavelength X 1 is that the light signal of 1550nm uses the light signal replacement of wavelength X 1 as 1560nm; Wavelength X 2 is that the light signal of 1570nm uses the light signal replacement of wavelength X 2 as 1580nm, and other steps of this step are identical with embodiment 1.
At the Measuring Time transmitting control end of embodiment 1 in two different wave length transmission delay differences of user's receiving terminal step 1; With wavelength X 1 is that the light signal of 1550nm uses the light signal replacement of wavelength X 1 as 1570nm; Wavelength X 2 is that the light signal of 1570nm uses the light signal replacement of wavelength X 2 as 1590nm, and other steps of this step are identical with embodiment 1.Postponing to user's receiving terminal closed loop transmission in the Δ T step 2 at Measuring Time transmitting control end, be that the light signal of 1570nm uses wavelength X 2 to replace as the light signal of 1590nm with wavelength X 2, and other steps of this step are identical with embodiment 1.In calculating and compensation process 3 that time transmitting control end postpones to user's receiving terminal one-way transmission; With wavelength X 1 is that the light signal of 1550nm uses the light signal replacement of wavelength X 1 as 1570nm; Wavelength X 2 is that the light signal of 1570nm uses the light signal replacement of wavelength X 2 as 1590nm, and other steps of this step are identical with embodiment 1.
Embodiment 4
At the Measuring Time transmitting control end of embodiment 1 in two different wave length transmission delay differences of user's receiving terminal step 1; With wavelength X 1 is that the light signal of 1550nm uses the light signal replacement of wavelength X 1 as 1330nm; Wavelength X 2 is that the light signal of 1570nm uses the light signal replacement of wavelength X 2 as 1350nm, and other steps of this step are identical with embodiment 1.Postponing to user's receiving terminal closed loop transmission in the Δ T step 2 at Measuring Time transmitting control end, be that the light signal of 1570nm uses wavelength X 2 to replace as the light signal of 1350nm with wavelength X 2, and other steps of this step are identical with embodiment 1.In calculating and compensation process 3 that time transmitting control end postpones to user's receiving terminal one-way transmission; With wavelength X 1 is that the light signal of 1550nm uses the light signal replacement of wavelength X 1 as 1330nm; Wavelength X 2 is that the light signal of 1570nm uses the light signal replacement of wavelength X 2 as 1350nm, and other steps of this step are identical with embodiment 1.
Embodiment 5
At the Measuring Time transmitting control end of embodiment 1 in two different wave length transmission delay differences of user's receiving terminal step 1; With wavelength X 1 is that the light signal of 1550nm uses the light signal replacement of wavelength X 1 as 1340nm; Wavelength X 2 is that the light signal of 1570nm uses the light signal replacement of wavelength X 2 as 1370nm, and other steps of this step are identical with embodiment 1.Postponing to user's receiving terminal closed loop transmission in the Δ T step 2 at Measuring Time transmitting control end, be that the light signal of 1570nm uses wavelength X 2 to replace as the light signal of 1370nm with wavelength X 2, and other steps of this step are identical with embodiment 1.In calculating and compensation process 3 that time transmitting control end postpones to user's receiving terminal one-way transmission; With wavelength X 1 is that the light signal of 1550nm uses the light signal replacement of wavelength X 1 as 1340nm; Wavelength X 2 is that the light signal of 1570nm uses the light signal replacement of wavelength X 2 as 1370nm, and other steps of this step are identical with embodiment 1.
Embodiment 6
At the Measuring Time transmitting control end of embodiment 1 in two different wave length transmission delay differences of user's receiving terminal step 1; With wavelength X 1 is that the light signal of 1550nm uses the light signal replacement of wavelength X 1 as 1250nm; Wavelength X 2 is that the light signal of 1570nm uses the light signal replacement of wavelength X 2 as 1380nm, and other steps of this step are identical with embodiment 1.Postponing to user's receiving terminal closed loop transmission in the Δ T step 2 at Measuring Time transmitting control end, be that the light signal of 1570nm uses wavelength X 2 to replace as the light signal of 1380nm with wavelength X 2, and other steps of this step are identical with embodiment 1.In calculating and compensation process 3 that time transmitting control end postpones to user's receiving terminal one-way transmission; With wavelength X 1 is that the light signal of 1550nm uses the light signal replacement of wavelength X 1 as 1350nm; Wavelength X 2 is that the light signal of 1570nm uses the light signal replacement of wavelength X 2 as 1380nm, and other steps of this step are identical with embodiment 1.
Claims (2)
1. optical fiber time is transmitted the removing method of the asymmetric delay of wavelength division multiplexing, it is characterized in that it is made up of following step:
(1) Measuring Time transmitting control end is to two different wave length transmission delay differences of user's receiving terminal
At time transmitting control end; The 1pps signal that atomic clock is come divides two-way output through the radiofrequency signal of coding demodulator modulation; One the tunnel outputs to laser 1, and another road outputs to laser 2, and laser 1 outputs to wavelength division multiplexer 1 with the light signal that radiofrequency signal is modulated into wavelength X 1; Laser 2 outputs to optics selector switch 1 with the light signal that radiofrequency signal is modulated into wavelength X 2; 1,2 terminations at optics selector switch 1 are logical, and when optics selector switch 1,3 ends broke off, the light signal of wavelength X 2 outputed to wavelength division multiplexer 1; Wavelength division multiplexer 1 is with the light signal of wavelength X 1 and the light signal feed-in optical fiber of wavelength X 2, through the wavelength division multiplexer 2 of Optical Fiber Transmission to user's receiving terminal; Wavelength division multiplexer 2 outputs to optical-electrical converter 1 with the light signal of wavelength X 1; Optical-electrical converter 1 converts the light signal of importing to radiofrequency signal and outputs to demodulating and decoding device 1 and laser 3, and demodulating and decoding device 1 is demodulated to the 1pps signal with radiofrequency signal and outputs to time-interval counter 2; Wavelength division multiplexer 2 outputs to optical switch 2 with the light signal of wavelength X 2; At this moment 1 of optical switch 2,3 terminations are logical; 1,2 ends of optical switch 2 break off; The light signal of wavelength X 2 is outputed to optical-electrical converter 2, and optical-electrical converter 2 converts the light signal of importing to radiofrequency signal and outputs to demodulating and decoding device 2, and demodulating and decoding device 2 is demodulated to the 1pps signal with radiofrequency signal and outputs to time-interval counter 2; 2 pairs of two 1pps signals of time-interval counter carry out time difference measurements, and measurement result is the transmission delay differences Δ t of wavelength X 1 and wavelength X 2 light signals;
Above-mentioned λ 1 light signal and the wave-length coverage of λ 2 light signals are 1550nm or 1331nm universal optical fibre communication band;
(2) Measuring Time transmitting control end postpones Δ T to user's receiving terminal closed loop transmission
At user's receiving terminal; Laser 3 outputs to optics selector switch 2 with the light signal that radiofrequency signal is modulated into wavelength X 2; 1,2 terminations of optical switch 2 are logical, and 1,3 ends of optics selector switch 2 break off, and the light signal of wavelength X 2 outputs to wavelength division multiplexer 2; Wavelength division multiplexer 2 bursts the light signal of wavelength X 2 into optical fiber; Through optical fiber the optical return signal of wavelength X 2 is passed to the wavelength division multiplexer 1 of time transmitting control end, wavelength division multiplexer 1 outputs to optics selector switch 1 with the light signal of wavelength X 2, and 1,3 terminations of optical switch 1 are logical; When 1,2 ends of light selector switch 1 break off; The light signal of wavelength X 2 outputs to optical-electrical converter 3, converts radiofrequency signal to through optical-electrical converter 3 and outputs to demodulating and decoding device 3, and demodulating and decoding device 3 demodulates radiofrequency signal the 1pps pps pulse per second signal of passback; The 1pps signal that the 1pps pulse signal of passback and atomic clock come is given time-interval counter 1 simultaneously and is carried out time difference measurements, and measurement result is that time transmitting control end postpones Δ T to user's receiving terminal closed loop transmission;
(3) time transmitting control end is to the calculating and the compensation of the delay of user's receiving terminal one-way transmission
Optical signal transmission from time transmitting control end to user's receiving terminal wavelength X 1 postpones to be Δ T
1, the optical signal transmission of wavelength X 2 postpones to be Δ T
2, then
ΔT
2-ΔT
1＝Δt
Δ t is two different wave length asymmetry differences, is the measurement result of time-interval counter 2;
Because laser 2 adopts identical wavelength X 2 with laser 3, therefore
ΔT
1+ΔT
2＝ΔT
Δ T is that time transmitting control end postpones to user's receiving terminal closed loop transmission, is the measurement result of time-interval counter 1.Calculate by following formula:
ΔT-Δt＝(ΔT
1+ΔT
2)-(ΔT
2-ΔT
1)＝2ΔT
1
At time transmitting control end, coding demodulator receives closed loop transmission delayed data Δ T that time-interval counter 1 sends here and from two different wave length asymmetry difference DELTA t that user's receiving terminal transmits, calculates wavelength X 1 transmission delay Δ T
1, eliminated the asymmetric problem of the transmission delay of two different wave lengths, and according to transmission delay Δ T
1Carry out pre-compensating.User's receiving terminal just can obtain and time transmitting control end synchronised.
2. transmit the removing method of the asymmetric delay of wavelength division multiplexing according to the described optical fiber of claim 1 time, it is characterized in that: the wave-length coverage of described λ 1 light signal and λ 2 light signals is 1550nm universal optical fibre communication bands.
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| CN105634643A (en) * | 2016-01-27 | 2016-06-01 | 中国人民解放军国防科学技术大学 | Fiber time and frequency transfer method, device and system based on bidirectional spread spectrum ranging |
| CN105723638A (en) * | 2013-08-22 | 2016-06-29 | 瑞典爱立信有限公司 | A method for detecting timing references affected by a change in path delay asymmetry between nodes in a communications network |
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| CN105723638A (en) * | 2013-08-22 | 2016-06-29 | 瑞典爱立信有限公司 | A method for detecting timing references affected by a change in path delay asymmetry between nodes in a communications network |
| CN105723638B (en) * | 2013-08-22 | 2019-01-01 | 瑞典爱立信有限公司 | Method for detecting the timing reference influenced by the change in the path delay asymmetry between the node in communication network |
| CN103957068B (en) * | 2014-04-14 | 2016-08-17 | 杭州电子科技大学 | A kind of RB particle filter method for synchronizing time based on DPM model |
| WO2016000287A1 (en) * | 2014-07-04 | 2016-01-07 | 上海交通大学 | High-precision optical fiber bidirectional time comparison method and system |
| US10063315B2 (en) | 2014-07-04 | 2018-08-28 | Shanghai Jiao Tong University | Method and system for high-precision two-way fiber-optic time transfer |
| CN105356944B (en) * | 2015-10-09 | 2018-01-05 | 西南民族大学 | Dispersion compensation device and method for high-precision optical fiber time dissemination system |
| CN105356944A (en) * | 2015-10-09 | 2016-02-24 | 西南民族大学 | Dispersion compensation device and method for high-accuracy optical fiber timing system |
| CN105634643B (en) * | 2016-01-27 | 2018-02-02 | 中国人民解放军国防科学技术大学 | A kind of optical fiber time Frequency Transfer method, apparatus and system based on two-way spread spectrum ranging |
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| CN106225949A (en) * | 2016-08-04 | 2016-12-14 | 电子科技大学 | Wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor |
| CN106571874A (en) * | 2016-10-28 | 2017-04-19 | 中国计量科学研究院 | Optical fiber unidirectional time frequency transmission system and optical fiber unidirectional time frequency transmission method |
| CN106603184A (en) * | 2016-11-18 | 2017-04-26 | 中国科学院国家授时中心 | High-precision multi-station fiber time synchronization method |
| CN106603184B (en) * | 2016-11-18 | 2018-05-15 | 中国科学院国家授时中心 | A kind of high accuracy multi-site optical fiber time synchronous method |
| CN109634093A (en) * | 2019-01-16 | 2019-04-16 | 和芯星通科技(北京)有限公司 | A kind of time service method and GNSS receiver based on GNSS receiver |
| CN110166160A (en) * | 2019-05-27 | 2019-08-23 | 山东大学 | Star network temporal frequency synchronization system and synchronous method |
| 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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