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A method for estimating and compensating the delay deviation of dual-fiber double-loopback in optical fiber time transfer

A technology of time transfer and loopback delay, which is applied in the direction of time division multiplexing system, electrical components, multiplexing communication, etc., to achieve the effect of eliminating unmeasurable, improving transmission accuracy and eliminating influence

Active Publication Date: 2021-10-22
NAVAL UNIV OF ENG PLA
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Problems solved by technology

Therefore, it is only suitable for testing under normal temperature conditions in the laboratory, and further analysis is required for the actual laid optical fiber

Method used

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  • A method for estimating and compensating the delay deviation of dual-fiber double-loopback in optical fiber time transfer
  • A method for estimating and compensating the delay deviation of dual-fiber double-loopback in optical fiber time transfer
  • A method for estimating and compensating the delay deviation of dual-fiber double-loopback in optical fiber time transfer

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with accompanying drawing:

[0040] Such as figure 1Shown: the present invention comprises master and slave two time service stations, master time service station comprises: clock source, laser transmitter, wavelength division multiplexing module, time interval counter, light detector, from time service station comprises: clock, laser transmitter, Wavelength division multiplexing module, time interval counter, optical detector, delay compensation module; laser transmitter is used to convert time signal into optical signal; wavelength division multiplexing module is used to modulate time signal to two different wavelengths and send it to optical fiber In the link, the input end of the transmission channel is connected to the output end of the laser transmitter, and the output end of the transmission channel is used to connect with the optical fiber link; the output end of the receiving channel of the wa...

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Abstract

The invention discloses a method for estimating and compensating the delay deviation of dual-fiber double-loopback in optical fiber time transfer, and obtains the measurement value TIC through three time measurement modules 1 、TIC 2 and TIC 3 ; Calculate the one-way delay value τ from the master station to the slave station by obtaining the delay value and the delay ratio relationship 1 ; The time delay value τ obtained by 1 Compensate the clock of the slave station in the delay compensation module of the slave station to realize the time synchronization of the master and slave stations; repeat the above steps to obtain τ 1 The real-time value of the master-slave site real-time synchronization. The method of the present invention can eliminate the impact of environmental temperature changes on the optical fiber time synchronization accuracy, and at the same time eliminate the unmeasurable length of the optical fiber in the existing network and the influence of the optical fiber length by temperature changes, and can monitor the time delay deviation when the time signal is transmitted in the optical fiber link Accurate measurement and real-time automatic compensation can improve the accuracy of optical fiber time transfer.

Description

technical field [0001] The invention relates to the technical field of optical fiber time synchronization, in particular to a method for estimating and compensating for a dual-fiber double-loop time delay deviation in optical fiber time transfer. Background technique [0002] With the continuous breakthrough of high-precision frequency standard technology, the current atomic frequency standard with the highest precision has reached 10 -16 order of magnitude, the second stability and day stability of the optical clock have reached 10 -16 and 10 -18 Time has become the physical quantity with the highest measurement accuracy among the seven international basic units. With the continuous improvement of time synchronization accuracy and stability requirements in scientific research, navigation and positioning, aerospace, power transmission, military security and other fields, how to transmit high-precision time-frequency information to each client has become an important topic ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06
CPCH04J3/0638H04J3/0682
Inventor 李方能陈丁吴苗许江宁何泓洋梁益丰于燕婷
Owner NAVAL UNIV OF ENG PLA
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