CN109302258A - The autocompensation installation and method of time-delay deviation in a kind of transmitting of optical fiber time - Google Patents
The autocompensation installation and method of time-delay deviation in a kind of transmitting of optical fiber time Download PDFInfo
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Abstract
The invention discloses the autocompensation installations and method of time-delay deviation in a kind of transmitting of optical fiber time, comprising: time difference measurement module and delay compensation module are provided in transmitting terminal；Time difference measurement module, for receive transmitting terminal sending time reference signal and return time signal and the time difference value that both exports；Delay compensation module, the time difference value for being obtained according to time difference measurement module obtains delay compensation value and the time reference signal issued to transmitting terminal compensates；The round-trip delay difference for obtaining two-way different wave length signal transmission in default same root optical fiber link is calculated by time difference measurement module；It is calculated by the round-trip delay difference of acquisition and obtains delay compensation value；According to the delay compensation value of acquisition, time reference signal is compensated automatically by delay compensation module.The time-delay deviation when present invention can transmit two-way time signal in optical fiber link carries out real-time automatic compensation, and optical fiber time transmitting accuracy can be improved.
Description
Technical Field
The invention belongs to the technical field of optical fiber time service synchronization, and particularly relates to an automatic compensation device and method for time delay deviation in optical fiber time transmission.
Background
With the development of science and technology, increasingly high requirements are put forward on time service precision in the fields of aerospace, radar synchronization, tip weapon control, high-speed communication, deep space exploration and the like. The time service precision of the traditional time service methods such as long-wave time service, satellite time service and the like can only reach nanosecond level basically, and the time service precision of the optical fiber time transmission technology can be better than one hundred picoseconds. The optical fiber time transmission technology has the advantages of high time service precision, low equipment price and the like, and has wide application prospect.
In optical fiber time transmission, two laser signals with different wavelengths are usually adopted in the same optical fiber for bidirectional time signal transmission, and high-precision time transmission is realized through bidirectional time comparison; due to different laser wavelengths for transmitting the two-way time signals, the transmission time delay of the two-way time signals in the optical fiber link is different, so that time delay deviation is introduced, and the precision of optical fiber time transmission is influenced finally; however, the delay skew varies with the variation of the optical fiber link, and is difficult to compensate by a manually preset amount, so that the precision of the optical fiber time transmission is difficult to improve.
Disclosure of Invention
The present invention is directed to provide an apparatus and a method for automatically compensating delay skew in optical fiber time transmission, so as to solve the above-mentioned problems. The method of the invention can automatically compensate the time delay deviation of the bidirectional time signal when the bidirectional time signal is transmitted in the optical fiber link in real time, and can improve the optical fiber time transmission precision.
In order to achieve the purpose, the invention adopts the following technical scheme:
an apparatus for automatically compensating for delay skew in optical fiber time transfer, comprising: a transmitting end; a time difference measuring module and a time delay compensation module are arranged in the transmitting terminal; the time difference measuring module is used for receiving the standard time signal sent by the transmitting end and the returned time signal and outputting a time difference value of the standard time signal and the returned time signal; and the time delay compensation module is used for acquiring a time delay compensation value according to the time difference value acquired by the time difference measurement module and compensating the standard time signal transmitted by the transmitting end.
An apparatus for automatically compensating for delay skew in optical fiber time transfer, comprising: a transmitting end; the transmitting end includes: the time signal maintaining module, the time delay compensation module, the laser transmitter, the time difference measuring module, the detector and the micro-control unit are arranged in the time signal maintaining module; the input end of the time signal holding module is used for receiving a standard time signal, and the output end of the time signal holding module is respectively connected with the input ends of the time delay compensation module and the time difference measuring module; the input end of the detector is used for receiving the time signal returned to the transmitting end, and the output end of the detector is connected with the input end of the time difference measuring module; the output end of the time difference measuring module is connected with the input end of the micro-control unit; the output end of the micro control unit is connected with the input end of the delay compensation module; the output end of the time delay compensation module is connected with the input end of the laser transmitter, and the output end of the laser transmitter is used for transmitting a time signal.
Further, the method also comprises the following steps: a wavelength division multiplexing module; the input end of a transmitting channel of the wavelength division multiplexing module is connected with the output end of the laser transmitter, and the output end of the transmitting channel is used for being connected with an optical fiber link; the output end of the receiving channel of the wavelength division multiplexing module is connected with the input end of the receiver, and the input end of the receiving channel is used for being connected with the optical fiber link.
Further, the method also comprises a receiving end; the receiving end is connected with the transmitting end through an optical fiber link.
Further, the receiving end includes: the receiving end wavelength division multiplexing module, the receiving end laser emitter and the receiving end detector; the input end of a receiving channel of the receiving end wavelength division multiplexing module is connected with the optical fiber link, and the output end of the receiving end wavelength division multiplexing module is connected with the input end of the detector; one path of the output end of the detector is used for outputting a time signal, and the other path of the output end of the detector is connected with the input end of the laser transmitter at the receiving end; the input end of the transmitting channel of the receiving end wavelength division multiplexing module is connected with the output end of the receiving end laser transmitter, and the output end of the transmitting channel is connected with the optical fiber link.
An automatic compensation method for time delay deviation in optical fiber time transmission comprises the following steps:
step 1, calculating and obtaining a difference value of round-trip time delay of signal transmission with different bidirectional wavelengths in a preset same optical fiber link through a time difference measuring module;
step 2, calculating to obtain a time delay compensation value through the round-trip time delay difference value obtained in the step 1;
and 3, automatically compensating the standard time signal through a time delay compensation module according to the time delay compensation value obtained in the step 2.
Further, before step 1, the length L of the same preset optical fiber link is measured, and the wavelength λ of the bidirectional different wavelength signal is measured1And λ2Wherein λ is1For the wavelength, lambda, of the laser signal emitted by the laser transmitter at the transmitting end2The wavelength of a laser signal emitted by a laser emitter at a receiving end;
in step 1, the transmission time delay of the time signal from the transmitting end to the receiving end is tauλ1The transmission time delay of the time signal returned by the receiving end to the transmitting end is tauλ2The difference value of the round-trip time delay of the bidirectional signal transmission with different wavelengths is tauλ1+λ2In which τ isλ1+λ2＝τλ2+τλ1；
Wherein,in the formula,n is the refractive index and c is the speed of light.
Further, in step 2: the preset calculation formula of the length L of the same optical fiber link is as follows:
time delay compensation value tau of standard time signalλ1The calculation formula of (2) is as follows:
further, the specific compensation method in step 3 is as follows: will calculate tauλ1The value is sent to a time delay compensation module, and the interior of the time delay compensation module is according to tauλ1The values are time delay compensated.
Further, the method also comprises a step 4; and 4, repeating the steps 1 to 3 to enable the standard time signal to be automatically compensated in real time.
Compared with the prior art, the invention has the following beneficial effects:
the method comprises the steps of measuring the wavelengths of two laser signals with different wavelengths, measuring the round-trip delay difference value of time signals transmitted in two directions with different wavelengths in the same optical fiber link, calculating the transmission delay value of a standard time signal in the optical fiber link, and performing delay compensation on the standard time signal at a transmitting end through a delay compensation module; the invention can automatically compensate the introduced time delay deviation in real time aiming at different transmission time delays of two-way time signals in the optical fiber link, and can improve the optical fiber time transmission precision.
Furthermore, the invention adopts real-time automatic compensation, when the optical fiber link is changed or the length of the optical fiber link is increased or decreased, the precision of optical fiber time transmission is not influenced, and the invention has higher self-adaptability and flexibility.
Drawings
Fig. 1 is a block diagram schematically showing the structure of an apparatus for automatically compensating for delay variation in optical fiber time transmission according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Referring to fig. 1, an apparatus for automatically compensating delay skew in optical fiber time transmission according to the present invention includes: a transmitting end and a receiving end; the receiving end is connected with the transmitting end through an optical fiber link.
The transmitting end includes: the time signal maintaining module, the time delay compensation module, the laser emitter, the time difference measuring module, the detector, the wavelength division multiplexing module and the micro-control unit are arranged in the optical fiber; the input end of the time signal holding module is used for receiving a standard time signal, and the output end of the time signal holding module is respectively connected with the input ends of the time delay compensation module and the time difference measuring module; the input end of the detector is used for receiving the time signal returned to the transmitting end, and the output end of the detector is connected with the input end of the time difference measuring module; the output end of the time difference measuring module is connected with the input end of the micro-control unit; the output end of the micro control unit is connected with the input end of the delay compensation module; the output end of the time delay compensation module is connected with the input end of the laser transmitter, and the output end of the laser transmitter is used for transmitting a time signal. The input end of a transmitting channel of the wavelength division multiplexing module is connected with the output end of the laser transmitter, and the output end of the transmitting channel is connected with the optical fiber link; the output end of the receiving channel of the wavelength division multiplexing module is connected with the input end of the receiver, and the input end of the receiving channel is connected with the optical fiber link.
The receiving end includes: the receiving end wavelength division multiplexing module, the receiving end laser emitter and the receiving end detector; the input end of a receiving channel of the receiving end wavelength division multiplexing module is connected with the optical fiber link, and the output end of the receiving end wavelength division multiplexing module is connected with the input end of the detector; one path of the output end of the detector is used for outputting a time signal, and the other path of the output end of the detector is connected with the input end of the laser transmitter at the receiving end; the input end of the transmitting channel of the receiving end wavelength division multiplexing module is connected with the output end of the receiving end laser transmitter, and the output end of the transmitting channel is connected with the optical fiber link.
The invention discloses an automatic compensation method for time delay deviation in optical fiber time transmission, which is an automatic compensation method for time delay deviation with different wavelengths in two directions in optical fiber time transmission, and specifically comprises the following steps:
step 1, measuring the wavelengths of two laser signals with different wavelengths in optical fiber time transmission and recording the wavelengths; measuring the length L of the preset same optical fiber link and measuring the wavelength lambda of signals with different bidirectional wavelengths1And λ2Wherein λ is1For the wavelength, lambda, of the laser signal emitted by the laser transmitter at the transmitting end2The wavelength of the laser signal emitted by the laser emitter at the receiving end.
Step 2, measuring the round-trip delay difference value of the time signal transmitted in the same optical fiber link in two directions at different wavelengths through a time difference measuring module in the transmitter; the transmission time delay of the time signal from the transmitting end to the receiving end is tauλ1The transmission time delay of the time signal returned by the receiving end to the transmitting end is tauλ2The difference value of the round-trip time delay of the bidirectional signal transmission with different wavelengths is tauλ1+λ2In which τ isλ1+λ2＝τλ2+τλ1；
Wherein,wherein n is a refractive index and c is a speed of light.
Step 3, calculating a transmission delay value of the time signal transmitted from the transmitter to the receiver; the preset calculation formula of the length L of the same optical fiber link is as follows:
time delay compensation value tau of standard time signalλ1The calculation formula of (2) is as follows:
step 4, according to the calculated transmission delay value, carrying out delay compensation on a delay compensation module of the transmitter; in particular, τ to be calculated by the MCUλ1The value is sent to a time delay compensation module, and the interior of the time delay compensation module is according to tauλ1The values are time delay compensated.
And 5, repeating the steps 2 to 4 to realize the real-time automatic compensation of the time delay deviation of the bidirectional time signal introduced by different transmission time delays in the optical fiber link.
Examples
Referring to fig. 1, the method for automatically compensating the delay deviations of different bidirectional wavelengths in the optical fiber time transmission of the present invention specifically includes the following steps:
1) the method comprises the following steps of constructing an optical fiber time transmission system, connecting a transmitter and a receiver by using an optical fiber with the length of about 50km (the length of an optical fiber link can be any length not exceeding 100 km), respectively measuring the wavelengths of laser signals with two different wavelengths, and recording the wavelengths, wherein the method comprises the following steps:
1.1) measuring the wavelength of the laser signal of the fiber time-transfer transmitter with a high-precision wavemeter, λ1＝1543.73nm；
1.2) measuring the wavelength of the laser signal of the receiver with a high-precision wavelength meter, recording as λ2＝1542.94nm。
2) The method for measuring the round-trip delay difference value of the time signal transmitted in different two-way wavelengths in the same optical fiber link specifically comprises the following steps:
2.1) the optical fiber time transfer transmitter transmits the standard time signal kept by the transmitter to the receiver, and the time signal transmission time delay is recorded as tauλ1；
2.2) the receiver transmits the time signal to the transmitter after receiving the time signal, and the time signal transmission delay is recorded as tauλ2；
2.3) measuring the time difference between the time signal transmitted by the transmitter and the received time signal by a time difference measuring module in the transmitter to obtain the round-trip delay tau of the two-way transmission of the time signal in different wavelengths in one optical fiberλ1+λ2In which τ isλ1+λ2＝τλ2+τλ1。
3) Calculating the transmission time delay of the time signal from the transmitter to the receiver in the same optical fiber, comprising the following steps:
3.1) L is the length of the optical fiber link, n is the refractive index, c is the speed of light, and λ is the wavelength, the time delay of the time signal when transmitting in the optical fiber link with a certain length can be expressed as:
3.2) according to the formula, the round-trip transmission time delay of the time signal in the same optical fiber link with two directions and different wavelengths is as follows:
the link length L of the fiber is:
3.3) substituting the parameters into the following formula, the transmission delay value tau of the time signal transmitted from the transmitter to the receiver can be calculated in real timeλ1
4) The time delay compensation is carried out on the optical fiber time transmission transmitter, and the time delay compensation value tau is calculated in real timeλ1The time delay compensation module in the transmitter is used for carrying out real-time delay automatic compensation, so that the time delay deviation caused by different transmission time delays of the two-way time signal in the optical fiber link is compensated, and the measured optical fiber time transfer precision reaches 10ps @1s by comparing the standard time signal entering the transmitter with the time signal output by the receiver.
In summary, the present invention provides a method for automatically compensating the time delay deviations of two directions with different wavelengths in optical fiber time transmission, which uses two laser beams with different wavelengths in the same optical fiber to perform two-way time signal transmission, and firstly uses a wavelength meter to measure and record the wavelengths of the two laser beams; the optical fiber time transmission transmitter transmits a time signal to the receiver, the receiver transmits the time signal to the receiver after receiving the time signal, and the transmitter obtains the round-trip delay of the time signal in one optical fiber by measuring the time difference between the transmitted time signal and the received time signal; the time delay value of the transmitter for transmitting the time signal to the receiver is obtained through calculation, the time delay value is sent to a time delay compensation module in the transmitter for time delay compensation, and the compensation process is repeated, so that real-time automatic compensation of time delay deviation caused by different transmission time delays of the two-way time signal in an optical fiber link is realized, and the optical fiber time transmission precision is improved. The method adopts real-time automatic compensation, when the optical fiber link is changed or the length of the optical fiber link is increased or decreased, the precision of optical fiber time transmission is not influenced, the method has high adaptability and flexibility, and the method is adopted to carry out experiments on the optical fiber time transmission system, so that the time delay deviation caused by different wavelengths in the optical fiber time transmission is automatically compensated, and the optical fiber time transmission precision reaches 10ps @1 s.
Claims (10)
1. An apparatus for automatically compensating for delay skew in optical fiber time transfer, comprising: a transmitting end; it is characterized in that the preparation method is characterized in that,
a time difference measuring module and a time delay compensation module are arranged in the transmitting terminal;
the time difference measuring module is used for receiving the standard time signal sent by the transmitting end and the returned time signal and outputting a time difference value of the standard time signal and the returned time signal;
and the time delay compensation module is used for acquiring a time delay compensation value according to the time difference value acquired by the time difference measurement module and compensating the standard time signal transmitted by the transmitting end.
2. An apparatus for automatically compensating for delay skew in optical fiber time transfer, comprising: a transmitting end;
the transmitting end includes: the time signal maintaining module, the time delay compensation module, the laser transmitter, the time difference measuring module, the detector and the micro-control unit are arranged in the time signal maintaining module;
the input end of the time signal holding module is used for receiving a standard time signal, and the output end of the time signal holding module is respectively connected with the input ends of the time delay compensation module and the time difference measuring module; the input end of the detector is used for receiving the time signal returned to the transmitting end, and the output end of the detector is connected with the input end of the time difference measuring module; the output end of the time difference measuring module is connected with the input end of the micro-control unit; the output end of the micro control unit is connected with the input end of the delay compensation module; the output end of the time delay compensation module is connected with the input end of the laser transmitter, and the output end of the laser transmitter is used for transmitting a time signal.
3. The apparatus of claim 2, further comprising: a wavelength division multiplexing module;
the input end of a transmitting channel of the wavelength division multiplexing module is connected with the output end of the laser transmitter, and the output end of the transmitting channel is used for being connected with an optical fiber link; the output end of the receiving channel of the wavelength division multiplexing module is connected with the input end of the receiver, and the input end of the receiving channel is used for being connected with the optical fiber link.
4. The apparatus according to claim 2, further comprising a receiving end;
the receiving end is connected with the transmitting end through an optical fiber link.
5. The apparatus of claim 4, wherein the receiving end comprises: the receiving end wavelength division multiplexing module, the receiving end laser emitter and the receiving end detector;
the input end of a receiving channel of the receiving end wavelength division multiplexing module is connected with the optical fiber link, and the output end of the receiving end wavelength division multiplexing module is connected with the input end of the detector; one path of the output end of the detector is used for outputting a time signal, and the other path of the output end of the detector is connected with the input end of the laser transmitter at the receiving end; the input end of the transmitting channel of the receiving end wavelength division multiplexing module is connected with the output end of the receiving end laser transmitter, and the output end of the transmitting channel is connected with the optical fiber link.
6. An automatic compensation method for time delay deviation in optical fiber time transmission is characterized by comprising the following steps:
step 1, calculating and obtaining a difference value of round-trip time delay of signal transmission with different bidirectional wavelengths in a preset same optical fiber link through a time difference measuring module;
step 2, calculating to obtain a time delay compensation value through the round-trip time delay difference value obtained in the step 1;
and 3, automatically compensating the standard time signal through a time delay compensation module according to the time delay compensation value obtained in the step 2.
7. The method as claimed in claim 6, wherein before step 1, the length L of the predetermined same optical fiber link is measured, and the wavelength λ of the signal with two different wavelengths is measured1And λ2Wherein λ is1For the wavelength, lambda, of the laser signal emitted by the laser transmitter at the transmitting end2The wavelength of a laser signal emitted by a laser emitter at a receiving end;
in step 1, the transmission time delay of the time signal from the transmitting end to the receiving end is tauλ1The transmission time delay of the time signal returned by the receiving end to the transmitting end is tauλ2The difference value of the round-trip time delay of the bidirectional signal transmission with different wavelengths is tauλ1+λ2In which τ isλ1+λ2＝τλ2+τλ1；
Wherein,wherein n is a refractive index and c is a speed of light.
8. The method of claim 7, wherein the delay variation in the optical fiber time transmission is automatically compensated,
in the step 2: the preset calculation formula of the length L of the same optical fiber link is as follows:
time delay compensation value tau of standard time signalλ1The calculation formula of (2) is as follows:
9. the method of claim 8, wherein the delay variation in the optical fiber time transmission is automatically compensated,
the specific compensation method in the step 3 is as follows: will calculate tauλ1The value is sent to a time delay compensation module, and the interior of the time delay compensation module is according to tauλ1The values are time delay compensated.
10. The method of claim 6, further comprising the step 4;
and 4, repeating the steps 1 to 3 to enable the standard time signal to be automatically compensated in real time.
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| CN112202523B (en) * | 2020-10-10 | 2021-10-29 | 中国人民解放军海军工程大学 | Double-fiber double-wave time transfer system and instantaneous clock error estimation method |
| CN112202523A (en) * | 2020-10-10 | 2021-01-08 | 中国人民解放军海军工程大学 | Double-fiber double-wave time transfer system and instantaneous clock error estimation method |
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| CN117240393B (en) * | 2023-11-13 | 2024-01-23 | 四川长虹新网科技有限责任公司 | Multi-AP (access point) combination-oriented high-precision time-frequency synchronization method |
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