CN106209295B - The control method of two-way time division multiplexing Time Transmission system - Google Patents
The control method of two-way time division multiplexing Time Transmission system Download PDFInfo
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- CN106209295B CN106209295B CN201610571103.2A CN201610571103A CN106209295B CN 106209295 B CN106209295 B CN 106209295B CN 201610571103 A CN201610571103 A CN 201610571103A CN 106209295 B CN106209295 B CN 106209295B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04J14/00—Optical multiplex systems
- H04J14/08—Time-division multiplex systems
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Abstract
A kind of two-way time-multiplexed optical fiber time transmission system control method, includes the following steps successively:Before optical fiber link amplifier to after timing synchronization, optical fiber link amplifier to being adjusted to the second optical fiber time transfer unit local timing signal dynamic during timing synchronization and two-way time division multiplexing Time transfer receiver after sequential presynchronization, the second optical fiber time transfer unit local timing signal pre-adjustment, optical fiber link amplifier.With the extension of optical fiber link distance, unit, the mainly number of bidirectional optical amplifier in optical fiber time transmission system can be linearly increasing.The work schedule of each unit in coordination system of the present invention realizes high-precision long-distance optical fiber Time Transmission.
Description
Technical field
The present invention relates to optical fiber time Frequency Transfer field, specifically a kind of two-way time division multiplexing optical fiber time transmission system
Control method.
Background technology
High-precision Time Transmission technology is in fields such as satellite navigation, survey of deep space, geological mapping, fundamental physical quantity measurements
There is important application value.Currently based on the Time Transmission technology of satellite, as GPS regards method (CV) altogether, the two-way satellite time passes
(TWSTFT) is passed, the Time Transmission precision of ns magnitudes can be reached.With the more high stability such as light clock and uncertainty Zhong Yuan
It invents and puts into operation, these technologies cannot meet the needs of scientific research and social development.Based on satellite laser ranging (SLR)
The theoretical uncertainty of space-based Time Transmission technology (T2L2) can be better than 100ps.But space-based Time Transmission technology all exists
System complex, the shortcomings of expensive, performance period is long, safety is poor, poor reliability.Optical fiber is transmitted with low-loss, greatly
Capacity, high speed, high stable, safe and reliable advantage have been obtained for being widely applied in the communications field.Divided extensively using existing
The Networks of Fiber Communications of cloth, it is the effective way for realizing the transmission of high-precision long range time to carry out the Time Transmission based on optical fiber.
Based on same fine [clever referring to Wu tortoise with the two-way time-multiplexed optical fiber time transmission scheme of wave；Hu Liang；Zhang Hao；Chen Jian
It is flat, " the two-way Time transfer receiver method and system of high-precision optical fiber, " publication number：CN104168077A, 2014.] can ensure two-way
Time signal signal-to-noise ratio caused by propagation delay time and its symmetry of fluctuation and the two-way co-wavelength transmission rayleigh scattering noise of solution
Deterioration problem.With the increase of optical fiber time relays link distance, bidirectional optical amplifier is [referring to Zhang Hao；Wu's tortoise spirit；Chen Jianping, "
The two-way method of light amplification of high-precision optical fiber Time Transmission and device, " application number：CN201610073321.3,2016. number]
It can be linearly increasing.For being based on two-way time-multiplexed high-precision optical fiber Time Transmission, in order to meet the two-way time division multiplexing time
The requirement of transmission needs to coordinate each unit, synchronizes its internal work sequential.
Invention content
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of two-way time-multiplexed optical fiber time transmission
The control method of system.This method has coordinated each unit in optical fiber time transmission system, it can be achieved that high-precision long range light
Fine Time Transmission.
Technical solution of the invention is as follows：
A kind of control method of two-way time division multiplexing optical fiber time transmission system, two-way time division multiplexing optical fiber time transmit system
System includes constituting fiber transmission link by N number of bidirectional optical amplifier and (N+1) section optical fiber, is located at the first of the optical fiber link both ends
Optical fiber time transfer unit and the second optical fiber time transfer unit, feature are that this method includes the following steps successively：
1) it is specifically included to timing synchronization before optical fiber link amplifier：
When the first optical fiber time transfer unit detects local timing signal, starts optical signal and send, pass through optical fiber chain
Road direction the second optical fiber time transfer unit sending time code, timing code are closed optical signal after being sent completely and are sent；
Optical fiber link amplifier 1 is according to t at the time of detecting the first optical fiber time transfer unit sending time codef1, determine
T at the time of setting its internal transmission direction to fl transmission next timef11<tf1+T-ts, wherein T is the timing signal being passed
Period, tsFor the optical fiber link amplifier status handoff response time；Reaching, moment t is setf11When, optical fiber link is amplified
1 internal transmission direction of device is arranged and remains fl transmission so that the timing code from the first optical fiber time transfer unit is through light
Fibre enters optical fiber link amplifier 2；
Optical fiber link amplifier 2 is according to t at the time of the timing code for detecting the transmission of the first optical fiber time transfer unitf2, really
Fix t at the time of once setting its internal transmission direction to fl transmissionf22<tf2+T-ts；Reaching, moment t is setf22When,
2 internal transmission direction of optical fiber link amplifier is arranged and remains fl transmission so that is transmitted from the first optical fiber time single
The timing code of member enters optical fiber link amplifier 3 through optical fiber；
……
Optical fiber link amplifier N is according to t at the time of the timing code for detecting the transmission of the first optical fiber time transfer unitfn, really
Fix t at the time of once setting its internal transmission direction to fl transmissionfnn<tfn+T-ts；Reaching, moment t is setfnnWhen,
Optical fiber link amplifier N internal transmissions direction is arranged and remains fl transmission so that is transmitted from the first optical fiber time single
The timing code of member reaches the second optical fiber time transfer unit through optical fiber；
2) it is specifically included to sequential presynchronization after optical fiber link amplifier：
The timing signal delays from the first optical fiber time transfer unit that second optical fiber time transfer unit will receive
τd, the τdMore than or equal to timing code duration and start the sum of the time that optical signal is sent, and be encoded into timing code, starts
Optical signal is sent, and by optical fiber link to the first optical fiber time transfer unit sending time code, remaining time closes optical signal hair
It send；
Optical fiber link amplifier N is according to t at the time of the timing code for detecting the transmission of the second optical fiber time transfer unitbn, really
Fix t at the time of once setting its internal transmission direction to reverse transfersbnn<tbn+T-ts；Reaching, moment t is setbnnWhen,
Optical fiber link amplifier N internal transmissions direction is arranged and remains reverse transfers so that is transmitted from the second optical fiber time single
The timing code of member reaches optical fiber link amplifier N-1 through optical fiber；
Optical fiber link amplifier N-1 is according to t at the time of detecting the second optical fiber time transfer unit sending time codeb(n-1),
Determine t at the time of set its internal transmission direction to reverse transfers next timeb(n-1)(n-1)<tb(n-1)+T-ts；It is arranged reaching
Moment tb(n-1)(n-1)When, optical fiber link amplifier N-1 internal transmissions direction is arranged and remains reverse transfers so that from the
The timing code that two optical fiber time transfer units are sent reaches optical fiber link amplifier N-2 through optical fiber；
……
Optical fiber link amplifier 1 is according to t at the time of detecting the second optical fiber time transfer unit sending time codeb1, determine
T at the time of setting its internal transmission direction to reverse transfers next timeb11<tb1+T-ts；Reaching, moment t is setb11When, it will
1 internal transmission direction of optical fiber link amplifier is arranged and remains reverse transfers so that comes from the second optical fiber time transfer unit
The timing code of transmission reaches the first optical fiber time transfer unit through optical fiber；
3) the second optical fiber time transfer unit local timing signal pre-adjustment, specifically includes：
1. when the first optical fiber time transfer unit detects local timing signal, starts optical signal and send, the first optical fiber
Time Transmission unit by optical fiber link to the second optical fiber time unit sending time code, close optical signal and send by remaining time；
2. the second optical fiber time transfer unit detects after the timing signal that the first optical fiber time transfer unit is sent, survey
Amount local timing signal and receive from the difference τ between the timing signal that the first optical fiber time transfer unit is sent12, simultaneously
The one set time τ of timing signal delays sent from the first optical fiber time transfer unit that will be receivedd, when making the second optical fiber
Between transfer unit complete to the reception of the first optical fiber time transfer unit timing code after, immediately start optical signal send, by this
The time difference τ of timing signal and local measurement after delay12And τdIt is encoded in timing code, and by optical fiber link to first
Optical fiber time transfer unit sending time code, remaining time close optical signal and send；
3. at the time of 1. local timing signal that the first optical fiber time transfer unit measuring process is sent with from the second optical fiber
Time difference τ between the timing signal that Time Transmission unit receives21, and τ is decoded from timing code12And τd, the first light
The timing signal regularization condition and adjustment amount that fine Time Transmission unit gives according to table 1 calculate the second optical fiber time transfer unit
The adjustment amount T that local timing signal needsd, and timing code is incorporated into when detecting local timing signal next time, pass through optical fiber
Link is sent to the second optical fiber time transfer unit, remaining time closes optical signal and sends；
1 timing signal regularization condition of table and adjustment amount
4) it is specifically included to timing synchronization after optical fiber link amplifier：
Second optical fiber time transfer unit receive the first optical fiber time transfer unit transmission delay adjustment information, and
After detecting local timing signal, local timing signal is postponed by T by time delay adjustment unitd, it is incorporated into timing code, starts light letter
It number sends, and by optical fiber link to the first optical fiber time transfer unit sending time code, remaining time closes optical signal and sends；
Optical fiber link amplifier N is according to the t ' at the time of timing code for detecting the transmission of the second optical fiber time transfer unitbn, really
Fix t ' at the time of once setting its internal transmission direction to reverse transfersbnn<t′bn+T-ts；Reaching, moment t ' is setbnn
When, optical fiber link amplifier N internal transmissions direction is arranged and remains reverse transfers so that the second optical fiber time transfer unit
The timing code of transmission reaches optical fiber link amplifier N-1 through optical fiber；
At the time of optical fiber link amplifier N-1 is according to the timing code for detecting the transmission of the second optical fiber time transfer unit
t′b(n-1), determine t ' at the time of set its internal transmission direction to reverse transfers next timeb(n-1)(n-1)<t′b(n-1)+T-ts；
Reach setting moment t 'b(n-1)(n-1)When, optical fiber link amplifier N-1 internal transmissions direction is arranged and is remained reverse transfers,
So that the timing code that the second optical fiber time transfer unit is sent reaches optical fiber link amplifier N-2 through optical fiber；
……
Optical fiber link amplifier 1 is according to the t ' at the time of timing code for detecting the transmission of the second optical fiber time transfer unitb1, really
Fix t ' at the time of once setting its internal transmission direction to reverse transfersb11<t′b1+T-ts；Reaching, moment t ' is setb11
When, 1 internal transmission direction of optical fiber link amplifier is arranged and remains reverse transfers so that the second optical fiber time transfer unit
The timing code of transmission reaches the first optical fiber time transfer unit through optical fiber；
5) the second optical fiber time transfer unit local timing signal dynamic adjusts during two-way time division multiplexing Time transfer receiver,
It is as follows：
The timing signal regularization condition and adjustment amount that first optical fiber time transfer unit gives according to table 2 calculate the second light
The adjustment amount T that fine Time Transmission unit local timing signal needsd, and with the clock difference comprising timing signal and local measurement
Timing code is sent to the second optical fiber time transfer unit；Second optical fiber time transfer unit passes through according to the adjustment amount received
Time delay adjustment unit adjusts local timing signal, records the adjustment amount and by adjustment amount TdIt is encoded to comprising the local after delay
In the clock difference timing code of timing signal and local measurement, it is sent to the first optical fiber time transfer unit；
2 timing signal regularization condition of table and adjustment amount
In table 1, τcFor the duration of timing code；T is the period of timing signal；τrFor reserved time division multiplexing redundancy time, τr
Including starting the time that optical signal is sent, time, optical fiber transmission delay variation and the apparatus measures error of closing optical signal transmission.
The technique effect of the present invention：
With the extension of optical fiber link distance, unit, mainly bidirectional optical amplifier in optical fiber time transmission system
Number, can be linearly increasing.Compared with prior art, in the method for the present invention coordination system each unit work schedule, can
Realize high-precision long-distance optical fiber Time Transmission.
Description of the drawings
Fig. 1 is the structural schematic diagram of two-way time division multiplexing optical fiber time transmission system embodiment；
Fig. 2 is the structural schematic diagram of the bidirectional optical amplifier of embodiment；
Fig. 3 is the sequence diagram of embodiment.
Specific implementation mode
With reference to embodiment and attached drawing, the invention will be further described, the present embodiment with the technical scheme is that
Premise is implemented, give detailed embodiment and with specific workflow, but protection scope of the present invention is not limited to
Following embodiments.
Fig. 1 is the structural schematic diagram of two-way time division multiplexing optical fiber time transmission system embodiment.As seen from the figure, the two-way time-division
Multiplexing fiber-optic Time Transmission system constitutes fiber transmission link by N number of bidirectional optical amplifier and (N+1) section optical fiber.When the first optical fiber
Between transfer unit be located at one end of optical fiber link, the second optical fiber time transfer unit is located at the other end of optical fiber link.From first
The transmission direction of optical fiber time transfer unit to the second optical fiber time transfer unit be it is preceding to；From the second optical fiber time transfer unit
Transmission direction to the first optical fiber time transfer unit is backward.The timing signal of transmission is 1PPS, and time code length is about 6 μ
s.Optical signal transmission with close by the maximum response time in optical fiber time transfer unit be 1ms 1 × 1 mechanical optical switch Lai
Control.
Fig. 2 is the structural schematic diagram of bidirectional optical amplifier in embodiment, is specifically included：First point/wave multiplexer 1, wave multiplexer
2,3, second points/wave multiplexer 4 of channel-splitting filter, the first optical branching device 5, the second optical branching device 6, control unit 7,2 × 2 photoswitch, 8 He
Unidirectional optical amplifier 9.2 × 2 photoswitches 8 are 2 × 2 mechanical optical switches that maximum response time is 1ms.
Based on time-multiplexed high-precision long-distance optical fiber Time Transmission system control method (as shown in Figure 3), wrap successively
It includes single to being transmitted to sequential presynchronization, the second optical fiber time after timing synchronization, optical fiber link amplifier before optical fiber link amplifier
To during timing synchronization and two-way time division multiplexing Time transfer receiver after first local timing signal pre-adjustment, optical fiber link amplifier
Two optical fiber time transfer unit local timing signal dynamics adjust.
Before optical fiber link amplifier to timing synchronization continuous service after the completion of optical fiber link amplifier to timing synchronization,
Detailed process is as follows：
First optical fiber time transfer unit：At the time of first optical fiber time transfer unit is according to detecting that local 1PPS arrives
tm1, t at the time of determining opening photoswitch next timem11=tm1+0.999.Reach tm11When, the first optical fiber time transfer unit
Photoswitch is opened, when local 1PPS being incorporated into timing code, and being sent to the second optical fiber time transfer unit by optical fiber link
Between code.Photoswitch is closed after the transmission of deadline code；
Optical fiber link amplifier 1：Optical fiber link amplifier 1 according to detect the first optical fiber time transfer unit send when
Between code at the time of tf1, determine that 2 × 2 optical switch status of switching make t at the time of internal transmission direction is fl transmission next timef11
=tf1+0.9；Reaching, moment t is setf11When, to biography before 1 internal transmission direction of optical fiber link amplifier is arranged and is remained
It is defeated so that the timing code that the first optical fiber time transfer unit is sent enters optical fiber link amplifier 2 through optical fiber；
Optical fiber link amplifier 2：Optical fiber link amplifier 2 according to detect the first optical fiber time transfer unit send when
Between code at the time of tf2, determine that 2 × 2 optical switch status of switching make t at the time of internal transmission direction is fl transmission next timef22
=tf2+0.9；Reaching, moment t is setf22When, to biography before 2 internal transmission direction of optical fiber link amplifier is arranged and is remained
It is defeated so that the timing code that the first optical fiber time transfer unit is sent enters optical fiber link amplifier 3 through optical fiber；
……
Optical fiber link amplifier N：Optical fiber link amplifier N according to detect the first optical fiber time transfer unit send when
Between code at the time of tfn, determine that 2 × 2 optical switch status of switching make t at the time of internal transmission direction is fl transmission next timefnn
=tfn+0.9；Reaching, moment t is setfnnWhen, to biography before optical fiber link amplifier N internal transmissions direction is arranged and is remained
It is defeated so that the timing code that the first optical fiber time transfer unit is sent reaches through optical fiber and transmits the second optical fiber time transfer unit；
It is specifically included to sequential presynchronization after optical fiber link amplifier：
Second optical fiber time transfer unit：Second optical fiber time transfer unit is passed to receiving from the first optical fiber time
It is incorporated into timing code after passing the 1PPS delays 1.01ms of unit, and the first optical fiber time transfer unit is sent to by optical fiber link.
1 × 1 photoswitch of the second optical fiber time transfer unit is opened after being delayed 10 μ s, and is closed after timing code is sent completely；
Optical fiber link amplifier N：Optical fiber link amplifier N according to detect the second optical fiber time transfer unit send when
Between code at the time of tbn, determine that 2 × 2 optical switch status of switching make t at the time of internal transmission direction is reverse transfers next timebnn
=rbn+0.9；Reaching, moment t is setbnnWhen, to biography after optical fiber link amplifier N internal transmissions direction is arranged and is remained
It is defeated so that the timing code that the second optical fiber time transfer unit is sent reaches optical fiber link amplifier N-1 through optical fiber；
Optical fiber link amplifier N-1：Optical fiber link amplifier N-1 according to detect the second optical fiber time transfer unit send
Timing code at the time of tb(n-1), determine that 2 × 2 optical switch status of switching so that internal transmission direction is reverse transfers next time
Moment tb(n-1)(n-1)=tb(n-1)+0.9；Reaching, moment t is setb(n-1)(n-1)When, by optical fiber link amplifier N-1 internal transmissions
Direction is arranged and remains reverse transfers so that the timing code that the second optical fiber time transfer unit is sent reaches optical fiber chain through optical fiber
Road amplifier N-2；
……
Optical fiber link amplifier 1：Optical fiber link amplifier 1 according to detect the second optical fiber time transfer unit send when
Between code at the time of tb1, determine that 2 × 2 optical switch status of switching make t at the time of internal transmission direction is reverse transfers next timeb11
=tb1+0.9；Reaching, moment t is setb11When, to biography after 1 internal transmission direction of optical fiber link amplifier is arranged and is remained
It is defeated so that the timing code that the second optical fiber time transfer unit is sent reaches the first optical fiber time transfer unit through optical fiber；
Second optical fiber time transfer unit local timing signal pre-adjustment specifically includes：
On the basis of continuously keeping forward and backward optical fiber link time sharing transmissions, the second optical fiber time transfer unit also needs
By local 1PPS and receive the difference τ between the 1PPS from the first optical fiber time transfer unit12It is incorporated into comprising 1PPS
Timing code is sent to the first optical fiber time transfer unit.First optical fiber time transfer unit measures local 1PPS and receives the
Difference τ between the 1PPS that two optical fiber time transfer units are sent to21, and τ is decoded from timing code12；
In order to meet two-way time-multiplexed requirement, time-multiplexed redundancy time τ is reservedr=5ms (including 1 × 1 light is opened
It closes and opens and closes time, the variation of optical fiber transmission delay and apparatus measures error).
It needs to adjust local 1PPS if the first optical fiber time transfer unit calculates the second optical fiber time transfer unit, the
One optical fiber time transfer unit is incorporated into 1PPS adjustment amounts the timing code for including local 1PPS, is sent to the transmission of the second optical fiber time
Unit.Second optical fiber time transfer unit according to the data information received, by time delay adjustment unit to local 1PPS into
Row delay Td, and test the delay volume.
It completes after the second optical fiber time transfer unit local timing signal pre-adjustment i.e. into after optical fiber link amplifier
To timing synchronization, specifically include：
Second optical fiber time transfer unit：After second optical fiber time transfer unit detects local 1PPS, postponed Td
After be programmed into timing code.Second optical fiber time transfer unit, 1 × 1 photoswitch is opened in advance, is completed through optical fiber link to first
1 × 1 photoswitch is closed immediately after optical fiber time transfer unit sending time code；
Optical fiber link amplifier N：Optical fiber link amplifier N according to detect the second optical fiber time transfer unit send when
Between code at the time of t 'bn, at the time of determining that 2 × 2 optical switch status of switching so that internal transmission direction is reverse transfers next time
t′bnn=t 'bn+0.9；Reaching, moment t ' is setbnnWhen, optical fiber link amplifier N internal transmissions direction is arranged and is remained
Reverse transfers so that the timing code that the second optical fiber time transfer unit is sent reaches optical fiber link amplifier N-1 through optical fiber；
Optical fiber link amplifier N-1：Optical fiber link amplifier N-1 according to detect the second optical fiber time transfer unit send
Timing code at the time of t 'b(n-1), determine that 2 × 2 optical switch status of switching so that internal transmission direction is reverse transfers next time
Moment t 'b(n-1)(n-1)=t 'b(n-1)+0.9；Reaching, moment t ' is setb(n-1)(n-1)When, inside optical fiber link amplifier N-1
Transmission direction is arranged and remains reverse transfers so that the timing code that the second optical fiber time transfer unit is sent reaches light through optical fiber
Fine link amplifier N-2；
……
Optical fiber link amplifier 1：Optical fiber link amplifier 1 according to detect the second optical fiber time transfer unit send when
Between code at the time of t 'b1, at the time of determining that 2 × 2 optical switch status of switching so that internal transmission direction is reverse transfers next time
t′b11=t 'b1+0.9；Reaching, moment t ' is setb11When, 1 internal transmission direction of optical fiber link amplifier is arranged and is remained
Reverse transfers so that the timing code that the second optical fiber time transfer unit is sent reaches the first optical fiber time transfer unit through optical fiber；
To after the completion of timing synchronization after optical fiber link amplifier, the first optical fiber time transfer unit and the second optical fiber time pass
Pass unit by it is two-way it is time-multiplexed in a manner of carry out Time Transmission.It is needed to second during two-way time division multiplexing Time transfer receiver
The local 1PPS of optical fiber time transfer unit is adjusted into Mobile state, avoids in optical fiber link while having to pass from the first optical fiber time
Pass the optical signal of unit and the second optical fiber time transfer unit.It is as follows：First optical fiber time transfer unit is under
Table judges that the second optical fiber time transfer unit local 1PPS adjustment amounts need residing range, and dynamically with the width of stepping 5ns
Degree adjustment the second optical fiber time transfer unit local 1PPS adjustment amount sizes, so that it is remained within the scope of this, and by when
Prolong adjustment amount Td and be incorporated into the timing code for including local 1PPS and local measurement clock difference, is sent to the second optical fiber time and transmits list
Member.Second optical fiber time transfer unit passes through time delay adjustment unit adjustment local according to the time delay adjustment information received
1PPS records the adjustment amount and the adjustment amount is encoded to the timing code for including 1PPS and local measurement clock difference after delay
In, it is sent to the first optical fiber time transfer unit and is calculated for clock difference.
Claims (1)
1. a kind of control method of two-way time division multiplexing optical fiber time transmission system, two-way time division multiplexing optical fiber time transmission system
Including constituting fiber transmission link by N number of bidirectional optical amplifier and (N+1) section optical fiber, it is located at first light at the optical fiber link both ends
Fine Time Transmission unit and the second optical fiber time transfer unit, which is characterized in that this method includes the following steps successively：
1) it is specifically included to timing synchronization before optical fiber link amplifier：
When the first optical fiber time transfer unit detects local timing signal, start optical signal send, by optical fiber link to
Second optical fiber time transfer unit sending time code, timing code are closed optical signal after being sent completely and are sent；
Optical fiber link amplifier 1 is according to t at the time of detecting the first optical fiber time transfer unit sending time codef1, determine next
Secondary t at the time of set its internal transmission direction to fl transmissionf11<tf1+T-ts, wherein T is the week for the timing signal being passed
Phase, tsFor the optical fiber link amplifier status handoff response time；Reaching, moment t is setf11When, it will be in optical fiber link amplifier 1
Portion's transmission direction is arranged and remains fl transmission so that the timing code from the first optical fiber time transfer unit enters through optical fiber
Optical fiber link amplifier 2；
Optical fiber link amplifier 2 is according to t at the time of the timing code for detecting the transmission of the first optical fiber time transfer unitf2, under determination
T at the time of once setting its internal transmission direction to fl transmissionf22<tf2+T-ts；Reaching, moment t is setf22When, by light
2 internal transmission direction of fine link amplifier is arranged and remains fl transmission so that from the first optical fiber time transfer unit
Timing code enters optical fiber link amplifier 3 through optical fiber；
……
Optical fiber link amplifier N is according to t at the time of the timing code for detecting the transmission of the first optical fiber time transfer unitfn, under determination
T at the time of once setting its internal transmission direction to fl transmissionfnn<tfn+T-ts；Reaching, moment t is setfnnWhen, by light
Fine link amplifier N internal transmissions direction is arranged and remains fl transmission so that from the first optical fiber time transfer unit
Timing code reaches the second optical fiber time transfer unit through optical fiber；
2) it is specifically included to sequential presynchronization after optical fiber link amplifier：
The timing signal delays τ from the first optical fiber time transfer unit that second optical fiber time transfer unit will received, should
τdMore than or equal to timing code duration and start the sum of the time that optical signal is sent, and be encoded into timing code, starts light letter
It number sends, by optical fiber link to the first optical fiber time transfer unit sending time code, remaining time closes optical signal and sends；
Optical fiber link amplifier N is according to t at the time of the timing code for detecting the transmission of the second optical fiber time transfer unitbn, under determination
T at the time of once setting its internal transmission direction to reverse transfersbnn<tbn+T-ts；Reaching, moment t is setbnnWhen, by light
Fine link amplifier N internal transmissions direction is arranged and remains reverse transfers so that from the second optical fiber time transfer unit
Timing code reaches optical fiber link amplifier N-1 through optical fiber；
Optical fiber link amplifier N-1 is according to t at the time of detecting the second optical fiber time transfer unit sending time codeb(n-1), determine
T at the time of setting its internal transmission direction to reverse transfers next timeb(n-1)(n-1)<tb(n-1)+T-ts；Reaching, the moment is set
tb(n-1)(n-1)When, optical fiber link amplifier N-1 internal transmissions direction is arranged and remains reverse transfers so that comes from the second light
The timing code that fine Time Transmission unit is sent reaches optical fiber link amplifier N-2 through optical fiber；
……
Optical fiber link amplifier 1 is according to t at the time of detecting the second optical fiber time transfer unit sending time codeb1, determine next
Secondary t at the time of set its internal transmission direction to reverse transfersb11<tb1+T-ts；Reaching, moment t is setb11When, by optical fiber
1 internal transmission direction of link amplifier is arranged and remains reverse transfers so that is sent from the second optical fiber time transfer unit
Timing code through optical fiber reach the first optical fiber time transfer unit；
3) the second optical fiber time transfer unit local timing signal pre-adjustment, specifically includes：
1. when the first optical fiber time transfer unit detects local timing signal, starts optical signal and send, the first optical fiber time
Transfer unit by optical fiber link to the second optical fiber time unit sending time code, close optical signal and send by remaining time；
2. the second optical fiber time transfer unit detects after the timing signal that the first optical fiber time transfer unit is sent, this is measured
Ground timing signal and receive from the difference τ between the timing signal that the first optical fiber time transfer unit is sent12, while will connect
The one set time τ of timing signal delays sent from the first optical fiber time transfer unit receivedd, the second optical fiber time is made to pass
Unit is passed after completing to the reception of the first optical fiber time transfer unit timing code, starts optical signal immediately and sends, this is postponed
The time difference τ of timing signal and local measurement afterwards12And τdIt is encoded in timing code, and by optical fiber link to the first optical fiber
Time Transmission unit sending time code, remaining time close optical signal and send；
3. at the time of 1. local timing signal that the first optical fiber time transfer unit measuring process is sent with from the second optical fiber time
Time difference τ between the timing signal that transfer unit receives21, and τ is decoded from timing code12And τd, when the first optical fiber
Between transfer unit according to following given timing signal regularization condition and adjustment amount, it is local to calculate the second optical fiber time transfer unit
The adjustment amount T that timing signal needsd, and timing code is incorporated into when detecting local timing signal next time, pass through optical fiber link
It is sent to the second optical fiber time transfer unit, remaining time closes optical signal and sends；
Work as τ21-τd>2τ12, then τ12+τc+τr<Td<T-τ21+τd-τc-τr+τ12；
Work as τ12＜ ＜ T ＜ ＜ τ12+τc+τr, then τ12+τc+τr-T<Td<τd+τc+τr+τ12-τ21；
Work as T>τ12+τc+τr, and τ21-τd-τ12+τc+τr>0, then τ12+τc+τr<Td<T+τd-τc-τr+τ12-τ21；
Work as T>τ12+τc+τr, and τ21-τd-τ12+τc+τr<0, then it is not necessarily to adjustment；
Wherein, τcFor the duration of timing code；T is the period of timing signal；τrFor reserved time division multiplexing redundancy time, τrIncluding
Start the time that optical signal is sent, time, the variation of optical fiber transmission delay and the apparatus measures error of closing optical signal transmission；
4) it is specifically included to timing synchronization after optical fiber link amplifier：
Second optical fiber time transfer unit receives the delay adjustment information of the first optical fiber time transfer unit transmission, and is detecting
After local timing signal, local timing signal is postponed by T by time delay adjustment unitd, it is incorporated into timing code, starts optical signal hair
It send, and by optical fiber link to the first optical fiber time transfer unit sending time code, remaining time closes optical signal and sends；
Optical fiber link amplifier N is according to the t ' at the time of timing code for detecting the transmission of the second optical fiber time transfer unitbn, under determination
T ' at the time of once setting its internal transmission direction to reverse transfersbnn<t′bn+T-ts；Reaching, moment t ' is setbnnWhen, it will
Optical fiber link amplifier N internal transmissions direction is arranged and remains reverse transfers so that the second optical fiber time transfer unit is sent
Timing code reach optical fiber link amplifier N-1 through optical fiber；
Optical fiber link amplifier N-1 is according to the t ' at the time of timing code for detecting the transmission of the second optical fiber time transfer unitb(n-1),
Determine t ' at the time of set its internal transmission direction to reverse transfers next timeb(n-1)(n-1)<t′b(n-1)+T-ts；It is set in arrival
Set moment t 'b(n-1)(n-1)When, optical fiber link amplifier N-1 internal transmissions direction is arranged and remains reverse transfers so that the
The timing code that two optical fiber time transfer units are sent reaches optical fiber link amplifier N-2 through optical fiber；
……
Optical fiber link amplifier 1 is according to the t ' at the time of timing code for detecting the transmission of the second optical fiber time transfer unitb1, under determination
T ' at the time of once setting its internal transmission direction to reverse transfersb11<t′b1+T-ts；Reaching, moment t ' is setb11When, it will
1 internal transmission direction of optical fiber link amplifier is arranged and remains reverse transfers so that the second optical fiber time transfer unit is sent
Timing code through optical fiber reach the first optical fiber time transfer unit；
5) the second optical fiber time transfer unit local timing signal dynamic adjusts during two-way time division multiplexing Time transfer receiver, specifically
Steps are as follows：
First optical fiber time transfer unit is according to following given timing signal regularization condition and adjustment amount, when calculating the second optical fiber
Between transfer unit local timing signal need adjustment amount Td, and with the time comprising timing signal and the clock difference of local measurement
Code is sent to the second optical fiber time transfer unit；
Work as τ21-τd>2τ12, then τ12+τc+τr<Td<T-τ21+τd-τc-τr+τ12；
Work as τ12＜ ＜ T ＜ ＜ τ12+τc+τr, then τ12+τc+τr-T<Td<τd+τc+τr+τ12-τ21；
Work as T>τ12+τc+τr, and τ21-τd-τ12+τc+τr>0, then τ12+τc+τr<Td<T+τd-τc-τr+τ12-τ21；
Work as T>τ12+τc+τr, and τ21-τd-τ12+τc+τr<0, then it is not necessarily to adjustment；
Wherein, τcFor the duration of timing code；T is the period of timing signal；τrFor reserved time division multiplexing redundancy time, τrIncluding
Start the time that optical signal is sent, time, the variation of optical fiber transmission delay and the apparatus measures error of closing optical signal transmission；
Second optical fiber time transfer unit is according to the adjustment amount T receivedd, local timing signal is adjusted by time delay adjustment unit,
Record the adjustment amount and by adjustment amount TdIt is encoded to the clock difference comprising local timing signal and local measurement after delay
In timing code, it is sent to the first optical fiber time transfer unit.
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