CN102299743A - Post-compensation method for transmission time delay during optical fiber time transmission - Google Patents
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Abstract
The invention relates to a post-compensation method for transmission time delay during optical fiber time transmission. The method comprises the following steps of: measuring bidirectional closed loop transmission delay deltaT during the optical fiber time transmission, calculating unidirectional transmission delay during the optical fiber time transmission, performing post-compensation on time transmission 1pps, and recoding and modulating a time signal at a user receiving end. Next-level time transmission is performed by the same method, so that cascade connection can be conveniently performed, and transmission time is remotely and accurately synchronized. Compared with the conventional pre-compensation method, the post-compensation method has the advantages that: different time information advance is not required to be set according to different levels, and pre-compensation devices of different levels are not needed, so the method is easy and convenient to operate; and the method has the advantages that the method is simple and practical, is high in reliability, and can be popularized and used in the optical fiber time transmission.
Description
Technical field
The invention belongs to temporal frequency transmission technique field in the electronic information science, be specifically related to the compensation method of optical fiber time transmission propagation time delay.
Background technology
Temporal frequency delivery applications field in the electronic information science, the optical fiber time is transmitted time delay that adopts the transmission delay compensation method to eliminate transmission path and the drift that environmental factor causes, real-time implementation high precision time synchronization.The compensation that Optical Fiber Transmission postpones is based on into the optical fiber time transmission path of a closed loop, transmit transmitting terminal in the time, measure the propagation delay time of closed loop path, and think that the delay in round-trip transmission path is identical, therefore getting half of propagation delay time 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.
The compensation method of propagation time delay at present is to adopt transmission delay pre-compensating method.Its concrete way is: transmit transmitting terminal in the time, postpone according to measuring the one-way transmission of calculating, move the lead of pps pulse per second signal in the time signal of transmitting, this lead is to postpone to decide according to measuring the one-way transmission of calculating.Through the time signal of pre-compensating, when being delivered to user's receiving terminal, will obtain one with the pps pulse per second signal that transmits preamble.In fact, time signal moves pps pulse per second signal in the pre-compensating implementation process backward, and amount of movement is that the one-period of pulse per second (PPS) deducts the one-way transmission delay.Like this, the time signal through pre-compensating in that user side receives is actually the time signal that has postponed the cycle.For the pps pulse per second signal in the time signal, the pps pulse per second signal that user's receiving terminal receives and the pps pulse per second signal of transmitting terminal are synchronous, but for the temporal information in the time coding signal, still keep original temporal information.For example, referring to Fig. 2, the temporal information that is sent out is 9:35:47 on Thursday on the 24th March in 2011, and year, month, day, week are omitted among Fig. 2.Be delivered to user side behind the pre-compensating, remain 9:35:47, in fact the time is 9:35:48.The time that user side receives, lagged one second by time than reality.This situation can shift to an earlier date one second with the temporal information of transmitting for point-to-point when pre-compensating.Promptly at transmitting terminal, the time is set to 9:35:48, just can guarantee that temporal information and transmitting terminal that user side receives are synchronous.But, just constituted difficulty for multiple cascading networks.If there is the N level to connect, according to different stage, different temporal information leads is set, just need the pre-compensation means of different stage, user's receiving terminal can only receive other time signal at the corresponding levels.Like this, operation is got up pretty troublesome, very loaded down with trivial details.
Summary of the invention
Technical problem to be solved by this invention is to overcome the shortcoming of the compensation method of above-mentioned propagation time delay, provides a kind of and can arbitrarily carry out cascade, realizes that the optical fiber time of remote optical fiber time synchronized transmits the post-equalization method of propagation time delay.
Solving the problems of the technologies described above the technical scheme that is adopted is made up of following step:
1, the measuring optical fiber time is transmitted two-way closed loop transmission delay Δ T
At time transmitting control end, with reference time signal and 1pps signal that atomic clock comes, encoded modulators modulate becomes radiofrequency signal, and radiofrequency signal is that λ 1 laser 1 is modulated into light signal through wavelength, wavelength be λ 1 light signal through wavelength division multiplexer 1 feed-in optical fiber, through Optical Fiber Transmission to user's receiving terminal.At user's receiving terminal, wavelength X 1 light signal is demodulated into radiofrequency signal through optical-electrical converter 2 again through wavelength division multiplexer 2, and radiofrequency signal is that the laser 2 of λ 2 is modulated to light signal again by wavelength again.In order to improve precision, reduce the asymmetry of transmission delay, wavelength is that the light signal of λ 1 and light signal that wavelength is λ 2 adopt wavelength to divide multiplexing method to transmit less than the condensation wave of 1nm.Wavelength is that the light signal of λ 2 passes back to time transmitting control end through wavelength division multiplexer 2 and optical fiber again.At time transmitting control end, the wavelength that is returned by optical fiber and wavelength division multiplexer 1 is λ 2 light signals, demodulates radiofrequency signal by optical-electrical converter 1, and radiofrequency signal demodulates the 1pps signal of optical fiber closed loop passback again through demodulating and decoding device 1; To give time-interval counter simultaneously with reference to 1pps signal and passback 1pps signal, and carry out time difference measurement, the time-interval counter dateout postpones Δ T for the optical fiber closed loop transmission.
Above-mentioned wavelength is that the light signal of λ 1 and wave-length coverage that wavelength is the light signal of λ 2 are 1550nm or 1331nm universal optical fibre communication band.
2, calculate the optical fiber time and transmit the one-way transmission delay
At time transmitting control end, the optical fiber closed loop transmission delayed data Δ T of time-interval counter output is to coding demodulator 1, and the equipment that closed loop transmission delayed data Δ T includes time transmitting control end postpones Δ t
TPostpone Δ t with the equipment of user's receiving terminal
R, this equipment is calibrated mensuration before postponing to transmit in the time.In order to improve the measurement computational accuracy of transmission delay, wavelength is that the light signal of λ 1 and light signal that wavelength is λ 2 adopt condensation wave to divide multiplexing method, can think that the transmission delay of two wavelength is identical.Coding demodulator 1 calculates by following formula:
Δ τ is that one-way transmission postpones Δ t in the formula
TThe equipment that is time transmitting control end postpones Δ t
RThe equipment that is user's receiving terminal postpones, and Δ T is that closed loop transmission postpones.When coding demodulator 1 receives after time-interval counter sends Δ T data here, the one-way transmission that draws as calculated from time transmitting control end to user's receiving terminal postpones Δ τ, one-way transmission postpones Δ τ and reference time signal, the 1pps signal carries out coded modulation by coding demodulator 1 together, and is sent to user's receiving terminal.
3, the time is transmitted the post-equalization of 1pps
At user's receiving terminal, the radiofrequency signal of optical-electrical converter 2 outputs is given demodulating and decoding device 2, demodulating and decoding device 2 output 1pps signals, time information signal, one-way transmission postpone Δ τ, delay compensator compensates receiving the 1pps signal after receiving 1pps signal and one-way transmission delayed data Δ τ.So-called compensation is actually the 1pps signal leading edge that will receive and postpones 1s-Δ τ delayed data.Has realized synchronously the reference 1pps signal leading edge of the 1pps signal leading edge of delay compensation and time transmitting control end.
4, the time signal recompile of user's receiving terminal modulation
Because the time coding signal after the compensation has postponed 1s, the temporal information that user's receiving terminal is obtained than the reference time information delay of time transmitting control end 1 second.At user's receiving terminal, give coding demodulator 2 simultaneously with the 1pps signal of compensation and the time information signal of demodulating and decoding device 2 outputs, recompile modulation, the time encoding information of recompile modulation 1 second in advance.The temporal information that has guaranteed user side is synchronous with the temporal information that sends control end.Coding demodulator 2 can offer user time B coded signal, 1pps signal, 100MHz frequency signal, 10MHz frequency signal, 5MHz frequency signal, radiofrequency signal simultaneously.Can adopt the transmission of time of next stage and to use the same method.Can carry out cascade easily.And guarantee that the transmission time at a distance accurately synchronously.
The present invention adopts the time transmission of next stage and uses the same method, and can carry out cascade easily, and guarantees that the transmission time is remote accurately synchronously.The present invention compares with existing pre-compensating method, according to different stage, does not need different temporal information leads is set, and does not need the pre-compensation means of different stage, moves easy.The present invention has the simple, practical and reliable property of method advantages of higher, can transmit in the transmission in the optical fiber time and promote the use of.
Description of drawings
Fig. 1 is the flow chart of the embodiment of the invention 1.
Fig. 2 transmits pre-compensating and post-equalization transmission time signal sequence schematic diagram of the present invention the optical fiber time.
Embodiment
The present invention is described in more detail below in conjunction with drawings and Examples, but the invention is not restricted to these embodiment.
With 9 hours 35 minutes 47 second reference time signal from atomic clock is example, illustrates that the post-equalization method of optical fiber time transmission propagation time delay is as follows.
1, the measuring optical fiber time is transmitted closed loop transmission delay Δ T
Referring to Fig. 1,2, in Fig. 2, sequential A is the time coding signal that sends control end the time, comprises the 1pps signal, during time information signal, minute, second, and propagation time delay data Δ τ; Sequential B be user's receiving terminal receive do not carry out the time delay equalization time coding signal; Sequential C is the time coding signal of the employing pre-compensating method that receives of user's receiving terminal; Sequential D is behind the employing post-equalization of user's receiving terminal output and the time coding signal of recompile.
At time transmitting control end, 9 hours 35 fens 47 second reference times that atomic clock is next, give coding demodulator 1, coding demodulator 1 carries out time encoding according to sequential A earlier, be modulated into radiofrequency signal output, radiofrequency signal is given laser 1 and is modulated into wavelength X 1 and is the light signal of 1550nm, and wavelength X 1 is fed to wavelength division multiplexer 1 for the light signal of 1550nm, wavelength division multiplexer 1 is the light signal feed-in optical fiber of 1550nm with wavelength X 1, arrives user's receiving terminal through Optical Fiber Transmission.At user's receiving terminal, the wavelength X 1 that Optical Fiber Transmission is come be the light signal of 1550nm through wavelength division multiplexer 2, output to optical-electrical converter 2, optical-electrical converter 2 converts light signal to radiofrequency signal and outputs to laser 2 and demodulating and decoding device 2 simultaneously.The wavelength X 2 of laser 2 outputs is the light signal of 1551nm, and by wavelength division multiplexer 2 input optical fibres, optical fiber passes to time transmitting control end with wavelength X 2 for the optical return signal of 1551nm again.In order to improve precision, reduce the asymmetry of transmission delay, wavelength X 1 has improved precision for the light signal of 1550nm and wavelength X 2 adopts wavelength to divide multiplexing method to transmit less than the condensation wave of 1nm for the light signal of 1551nm, has reduced the asymmetry of transmission delay.At time transmitting control end, wavelength X 2 is the light signal process wavelength division multiplexer 1 of 1551nm, gives optical-electrical converter 1.Optical-electrical converter 1 converts light signal to radiofrequency signal and outputs to demodulating and decoding device 1, and demodulating and decoding device 1 demodulates the 1pps signal from radiofrequency signal, is the 1pps signal of optical fiber closed loop passback.To give time-interval counter 1 simultaneously with reference to the 1pps signal of 1pps signal and passback, carry out time difference measurement, time-interval counter output closed-loop transmission delay Δ T.
2, calculate the optical fiber time and transmit one-way transmission delay Δ τ
Referring to Fig. 1, at time transmitting control end, the optical fiber closed loop transmission delayed data Δ T of time-interval counter output is to coding demodulator 1, and the equipment that closed loop transmission delayed data Δ T includes time transmitting control end postpones Δ t
TPostpone Δ t with the equipment of user's receiving terminal
R, this equipment is calibrated mensuration before postponing to transmit transmission in the time.Owing to adopt condensation wave to divide multiplexing method, think that the transmission delay of two wavelength is identical.Coding demodulator 1 calculates by following formula:
Δ τ is that one-way transmission postpones Δ t in the formula
TThe equipment that is time transmitting control end postpones Δ t
RThe equipment that is user's receiving terminal postpones, and Δ T is that closed loop transmission postpones.When coding demodulator 1 receives after time-interval counter sends Δ T data here, the one-way transmission that draws as calculated from time transmitting control end to user's receiving terminal postpones Δ τ, one-way transmission postpones Δ τ and carries out coded modulation with reference time signal, 1pps signal by coding demodulator 1, and is sent to user's receiving terminal.
3, the optical fiber time is transmitted the post-equalization of 1pps
Referring to Fig. 1, at user's receiving terminal, the radiofrequency signal of optical-electrical converter 2 outputs is given demodulating and decoding device 2, demodulating and decoding device 2 at first demodulates time coding signal from radiofrequency signal, time coding signal is shown in sequential B, and demodulating and decoding device 2 output 1pps signals, time information signal, one-way transmission postpone Δ τ.Delay compensator compensates receiving the 1pps signal after receiving 1pps signal and one-way transmission delay Δ τ.So-called compensation is actually the 1pps signal leading edge that will receive and postpones 1s-Δ τ delayed data.Time encoding after the compensation is shown in sequential C, sequential D.The 1pps signal leading edge of delay compensation and time transmitting control end have been realized with reference to the 1pps signal leading edge synchronously.
4, the recompile of user's destination time signal modulation
Referring to Fig. 2, the time encoding of time transmitting control end is shown in sequential A, and temporal information is 9 hours 35 minutes 47 seconds, and the temporal information that user's receiving terminal demodulating and decoding device 2 is obtained is shown in sequential B, and temporal information still is 9 hours 35 minutes 47 seconds.Behind the elapsed time transmitting control end pre-compensating, time encoding is shown in sequential C, temporal information still is 9 hours 35 minutes 47 seconds, align with the forward position of the 1pps signal of sequential A in the forward position of the 1pps signal after the compensation, but at this moment the temporal information of sequential A has been 9 hours 35 minutes 48 seconds, and the temporal information behind the pre-compensating lagged behind 1 second than the temporal information of time transmitting control end.Therefore, at user's receiving terminal, give coding demodulator 2 simultaneously with the 1pps signal of compensation and the time information signal of demodulating and decoding device 2 outputs, the recompile modulation, the temporal information of modulation 1 second in advance, its time coding is shown in sequential D, and temporal information is adjusted into 9 hours 35 minutes 48 seconds.The temporal information and the reference time information synchronization that sends control end of user side like this, have just been guaranteed.Coding demodulator 2 can offer user time B coded signal, 1pps signal, 100MHz frequency signal, 10MHz frequency signal, 5MHz frequency signal, radiofrequency signal simultaneously.Can adopt the transmission of time of next stage and to use the same method.Can carry out cascade easily.And guarantee that the transmission time at a distance accurately synchronously.
Embodiment 2
With 9 hours 35 minutes 47 second reference time signal from atomic clock is example, illustrates that the post-equalization method of optical fiber time transmission propagation time delay is as follows.
Transmitting closed loop transmission in the measuring optical fiber time postpones in the Δ T step 1, at time transmitting control end, 9 hours 35 fens 47 second reference times that atomic clock is next, give coding demodulator 1, coding demodulator 1 carries out time encoding according to sequential A earlier, be modulated into radiofrequency signal output, radiofrequency signal is given laser 1 and is modulated into wavelength X 1 and is the light signal of 1570nm, wavelength X 1 is fed to wavelength division multiplexer 1 for the light signal of 1570nm, wavelength division multiplexer 1 is the light signal feed-in optical fiber of 1570nm with wavelength X 1, arrives user's receiving terminal through Optical Fiber Transmission.At user's receiving terminal, the wavelength X 1 that Optical Fiber Transmission is come be the light signal of 1570nm through wavelength division multiplexer 2, output to optical-electrical converter 2, optical-electrical converter 2 converts light signal to radiofrequency signal and outputs to laser 2 and demodulating and decoding device 2 simultaneously.The wavelength X 2 of laser 2 outputs is the light signal of 1571nm, and by wavelength division multiplexer 2 input optical fibres, optical fiber passes to time transmitting control end with wavelength X 2 for the optical return signal of 1571nm again.In order to improve precision, reduce the asymmetry of transmission delay, wavelength X 1 divides multiplexing method to transmit for the light signal employing wavelength of 1571nm less than the condensation wave of 1nm for the light signal of 1570nm and wavelength X 2.At time transmitting control end, wavelength X 2 is the light signal process wavelength division multiplexer 1 of 1571nm, gives optical-electrical converter 1.Optical-electrical converter 1 converts light signal to radiofrequency signal and outputs to demodulating and decoding device 1, and demodulating and decoding device 1 demodulates the 1pps signal from radiofrequency signal, is the 1pps signal of optical fiber closed loop passback.To give time-interval counter 1 simultaneously with reference to the 1pps signal of 1pps signal and passback, carry out time difference measurement, time-interval counter output closed-loop transmission delay Δ T.
Other step is identical with embodiment 1.
Embodiment 3
With 9 hours 35 minutes 47 second reference time signal from atomic clock is example, illustrates that the post-equalization method of optical fiber time transmission propagation time delay is as follows.
Transmitting closed loop transmission in the measuring optical fiber time postpones in the Δ T step 1, at time transmitting control end, 9 hours 35 fens 47 second reference times that atomic clock is next, give coding demodulator 1, coding demodulator 1 carries out time encoding according to sequential A earlier, be modulated into radiofrequency signal output, radiofrequency signal is given laser 1 and is modulated into wavelength X 1 and is the light signal of 1590nm, wavelength X 1 is fed to wavelength division multiplexer 1 for the light signal of 1590nm, wavelength division multiplexer 1 is the light signal feed-in optical fiber of 1590nm with wavelength X 1, arrives user's receiving terminal through Optical Fiber Transmission.At user's receiving terminal, the wavelength X 1 that Optical Fiber Transmission is come be the light signal of 1590nm through wavelength division multiplexer 2, output to optical-electrical converter 2, optical-electrical converter 2 converts light signal to radiofrequency signal and outputs to laser 2 and demodulating and decoding device 2 simultaneously.The wavelength X 2 of laser 2 outputs is the light signal of 1591nm, and by wavelength division multiplexer 2 input optical fibres, optical fiber passes to time transmitting control end with wavelength X 2 for the optical return signal of 1591nm again.In order to improve precision, reduce the asymmetry of transmission delay, wavelength X 1 divides multiplexing method to transmit for the light signal employing wavelength of 1591nm less than the condensation wave of 1nm for the light signal of 1590nm and wavelength X 2.At time transmitting control end, wavelength X 2 is the light signal process wavelength division multiplexer 1 of 1591nm, gives optical-electrical converter 1.Optical-electrical converter 1 converts light signal to radiofrequency signal and outputs to demodulating and decoding device 1, and demodulating and decoding device 1 demodulates the 1pps signal from radiofrequency signal, is the 1pps signal of optical fiber closed loop passback.To give time-interval counter 1 simultaneously with reference to the 1pps signal of 1pps signal and passback, carry out time difference measurement, time-interval counter output closed-loop transmission delay Δ T.
Other step is identical with embodiment 1.
Embodiment 4
With 9 hours 35 minutes 47 second reference time signal from atomic clock is example, illustrates that the post-equalization method of optical fiber time transmission propagation time delay is as follows.
Transmitting closed loop transmission in the measuring optical fiber time postpones in the Δ T step 1, at time transmitting control end, 9 hours 35 fens 47 second reference times that atomic clock is next, give coding demodulator 1, coding demodulator 1 carries out time encoding according to sequential A earlier, be modulated into radiofrequency signal output, radiofrequency signal is given laser 1 and is modulated into wavelength X 1 and is the light signal of 1330nm, wavelength X 1 is fed to wavelength division multiplexer 1 for the light signal of 1330nm, wavelength division multiplexer 1 is the light signal feed-in optical fiber of 1330nm with wavelength X 1, arrives user's receiving terminal through Optical Fiber Transmission.At user's receiving terminal, the wavelength X 1 that Optical Fiber Transmission is come be the light signal of 1330nm through wavelength division multiplexer 2, output to optical-electrical converter 2, optical-electrical converter 2 converts light signal to radiofrequency signal and outputs to laser 2 and demodulating and decoding device 2 simultaneously.The wavelength X 2 of laser 2 outputs is the light signal of 1331nm, and by wavelength division multiplexer 2 input optical fibres, optical fiber passes to time transmitting control end with wavelength X 2 for the optical return signal of 1331nm again.In order to improve precision, reduce the asymmetry of transmission delay, wavelength X 1 divides multiplexing method to transmit for the light signal employing wavelength of 1331nm less than the condensation wave of 1nm for the light signal of 1330nm and wavelength X 2.At time transmitting control end, wavelength X 2 is the light signal process wavelength division multiplexer 1 of 1331nm, gives optical-electrical converter 1.Optical-electrical converter 1 converts light signal to radiofrequency signal and outputs to demodulating and decoding device 1, and demodulating and decoding device 1 demodulates the 1pps signal from radiofrequency signal, is the 1pps signal of optical fiber closed loop passback.To give time-interval counter 1 simultaneously with reference to the 1pps signal of 1pps signal and passback, carry out time difference measurement, time-interval counter output closed-loop transmission delay Δ T.
Other step is identical with embodiment 1.
Embodiment 5
With 9 hours 35 minutes 47 second reference time signal from atomic clock is example, illustrates that the post-equalization method of optical fiber time transmission propagation time delay is as follows.
Transmitting closed loop transmission in the measuring optical fiber time postpones in the Δ T step 1, at time transmitting control end, 9 hours 35 fens 47 second reference times that atomic clock is next, give coding demodulator 1, coding demodulator 1 carries out time encoding according to sequential A earlier, be modulated into radiofrequency signal output, radiofrequency signal is given laser 1 and is modulated into wavelength X 1 and is the light signal of 1350nm, wavelength X 1 is fed to wavelength division multiplexer 1 for the light signal of 1350nm, wavelength division multiplexer 1 is the light signal feed-in optical fiber of 1350nm with wavelength X 1, arrives user's receiving terminal through Optical Fiber Transmission.At user's receiving terminal, the wavelength X 1 that Optical Fiber Transmission is come be the light signal of 1350nm through wavelength division multiplexer 2, output to optical-electrical converter 2, optical-electrical converter 2 converts light signal to radiofrequency signal and outputs to laser 2 and demodulating and decoding device 2 simultaneously.The wavelength X 2 of laser 2 outputs is the light signal of 1351nm, and by wavelength division multiplexer 2 input optical fibres, optical fiber passes to time transmitting control end with wavelength X 2 for the optical return signal of 1351nm again.In order to improve precision, reduce the asymmetry of transmission delay, wavelength X 1 divides multiplexing method to transmit for the light signal employing wavelength of 1351nm less than the condensation wave of 1nm for the light signal of 1350nm and wavelength X 2.At time transmitting control end, wavelength X 2 is the light signal process wavelength division multiplexer 1 of 1351nm, gives optical-electrical converter 1.Optical-electrical converter 1 converts light signal to radiofrequency signal and outputs to demodulating and decoding device 1, and demodulating and decoding device 1 demodulates the 1pps signal from radiofrequency signal, is the 1pps signal of optical fiber closed loop passback.To give time-interval counter 1 simultaneously with reference to the 1pps signal of 1pps signal and passback, carry out time difference measurement, time-interval counter output closed-loop transmission delay Δ T.
Other step is identical with embodiment 1.
Embodiment 6
With 9 hours 35 minutes 47 second reference time signal from atomic clock is example, illustrates that the post-equalization method of optical fiber time transmission propagation time delay is as follows.
Transmitting closed loop transmission in the measuring optical fiber time postpones in the Δ T step 1, at time transmitting control end, 9 hours 35 fens 47 second reference times that atomic clock is next, give coding demodulator 1, coding demodulator 1 carries out time encoding according to sequential A earlier, be modulated into radiofrequency signal output, radiofrequency signal is given laser 1 and is modulated into wavelength X 1 and is the light signal of 1390nm, wavelength X 1 is fed to wavelength division multiplexer 1 for the light signal of 1390nm, wavelength division multiplexer 1 is the light signal feed-in optical fiber of 1390nm with wavelength X 1, arrives user's receiving terminal through Optical Fiber Transmission.At user's receiving terminal, the wavelength X 1 that Optical Fiber Transmission is come be the light signal of 1390nm through wavelength division multiplexer 2, output to optical-electrical converter 2, optical-electrical converter 2 converts light signal to radiofrequency signal and outputs to laser 2 and demodulating and decoding device 2 simultaneously.The wavelength X 2 of laser 2 outputs is the light signal of 1391nm, and by wavelength division multiplexer 2 input optical fibres, optical fiber passes to time transmitting control end with wavelength X 2 for the optical return signal of 1391nm again.In order to improve precision, reduce the asymmetry of transmission delay, wavelength X 1 divides multiplexing method to transmit for the light signal employing wavelength of 1391nm less than the condensation wave of 1nm for the light signal of 1390nm and wavelength X 2.At time transmitting control end, wavelength X 2 is the light signal process wavelength division multiplexer 1 of 1391nm, gives optical-electrical converter 1.Optical-electrical converter 1 converts light signal to radiofrequency signal and outputs to demodulating and decoding device 1, and demodulating and decoding device 1 demodulates the 1pps signal from radiofrequency signal, is the 1pps signal of optical fiber closed loop passback.To give time-interval counter 1 simultaneously with reference to the 1pps signal of 1pps signal and passback, carry out time difference measurement, time-interval counter output closed-loop transmission delay Δ T.
Other step is identical with embodiment 1.
Claims (2)
1. optical fiber time is transmitted the post-equalization method of propagation time delay, it is characterized in that it is made up of following step:
(1) the measuring optical fiber time is transmitted two-way closed loop transmission delay Δ T
At time transmitting control end, reference time signal and 1pps signal that atomic clock is next, encoded modulators modulate becomes radiofrequency signal, radiofrequency signal is that λ 1 laser 1 is modulated into light signal through wavelength, wavelength be the light signal of λ 1 through wavelength division multiplexer 1 feed-in optical fiber, through Optical Fiber Transmission to user's receiving terminal; At user's receiving terminal, wavelength be the light signal of λ 1 through wavelength division multiplexer 2, be demodulated into radiofrequency signal through optical-electrical converter 2 again, radiofrequency signal is that the laser 2 of λ 2 is modulated to light signal again by wavelength again; Wavelength is that the light signal of λ 1 and light signal that wavelength is λ 2 adopt wavelength to divide multiplexing method to transmit less than the condensation wave of 1nm; Wavelength is that the light signal of λ 2 passes back to time transmitting control end through wavelength division multiplexer 2 and optical fiber again; At time transmitting control end, the wavelength that is returned by optical fiber and wavelength division multiplexer 1 is the light signal of λ 2, demodulates radiofrequency signal by optical-electrical converter 1, and radiofrequency signal demodulates the 1pps signal of optical fiber closed loop passback again through demodulating and decoding device 1; To give time-interval counter simultaneously with reference to 1pps signal and passback 1pps signal, and carry out time difference measurement, the time-interval counter dateout postpones Δ T for the optical fiber closed loop transmission;
Above-mentioned wavelength is that the light signal of λ 1 and wave-length coverage that wavelength is the light signal of λ 2 are 1550nm or 1331nm universal optical fibre communication band;
(2) calculate the optical fiber time and transmit the one-way transmission delay
At time transmitting control end, the optical fiber closed loop transmission delayed data Δ T of time-interval counter output is to coding demodulator 1, and coding demodulator 1 calculates by following formula:
Must the one-way transmission from time transmitting control end to user's receiving terminal postpone Δ τ, Δ τ is that one-way transmission postpones Δ t in the formula
TThe equipment that is time transmitting control end postpones Δ t
RThe equipment that is user's receiving terminal postpones, and Δ T is that closed loop transmission postpones Δ t
TWith Δ t
RCalibrate mensuration before the time transmission, one-way transmission postpones Δ τ and reference time signal, 1pps signal carry out coded modulation by coding demodulator 1, and is sent to user's receiving terminal;
(3) time is transmitted the post-equalization of 1pps
At user's receiving terminal, the radiofrequency signal of optical-electrical converter 2 outputs is given demodulating and decoding device 2, demodulating and decoding device 2 carries out demodulating and decoding output 1pps signal, time information signal, one-way transmission delay Δ τ to delay compensator, delay compensator compensates the 1pps signal, and the 1pps signal leading edge of the 1pps signal leading edge of delay compensation and time transmitting control end reference is synchronous;
(4) recompile of user's destination time signal modulation
At user's receiving terminal, give coding demodulator 2 simultaneously with the 1pps signal of compensation and the time information signal of demodulating and decoding device 2 outputs, the recompile modulation, the time encoding information of modulation 1 second in advance, coding demodulator 2 offers user time B coded signal, 1pps signal, 100MHz frequency signal, 10MHz frequency signal, 5MHz frequency signal, radiofrequency signal simultaneously, and the time transmission of next stage is adopted and used the same method.
2. transmit the post-equalization method of propagation time delay according to the described optical fiber of claim 1 time, it is characterized in that: transmit in the post-equalization step (3) of 1pps in the optical fiber time, described delay compensator compensates to delay compensator the 1pps signal 1pps signal leading edge that receives is postponed 1 second-Δ τ delayed data.
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| CN109756321A (en) * | 2017-11-01 | 2019-05-14 | 中兴通讯股份有限公司 | A kind of time synchronism apparatus and method |
| CN110290434A (en) * | 2019-07-05 | 2019-09-27 | 北京电子工程总体研究所 | Nonperiodic signal synchronous method and system based on optical fiber transmission delay real-time compensation |
| CN111431603A (en) * | 2020-03-26 | 2020-07-17 | 中科启迪光电子科技(广州)有限公司 | Fiber-based combat platform time-frequency transmission bus system and method |
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| CN111934805A (en) * | 2020-07-10 | 2020-11-13 | 中国人民解放军61081部队 | Ground inter-station time-frequency transfer method suitable for pseudo satellite augmentation system |
| CN114726443A (en) * | 2022-02-25 | 2022-07-08 | 中国电子科技集团公司第二十九研究所 | Microwave photon bidirectional time-frequency transmission system, device and method |
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