Device and method for correcting frequency signal phase in optical fiber time-frequency transmission
A technology of frequency signal and optical fiber frequency, which is applied in the direction of synchronization device, synchronization error correction, transmission system, etc., can solve the problems of frequency signal frequency signal phase relationship uncertainty, etc., and achieve the effect of improving certainty and reproducibility
Active Publication Date: 2021-06-29
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology
Although the frequency signal output by the receiving end and the frequency signal at the sending end maintain phase stability as long as the lock is maintained after locking, the receiving end needs to divide the transmitted high-frequency signal before using it. During the frequency division process The frequency divider has the randomness of the initial value, so every time the system is turned on or re-locked after the system loses lock, the phase relationship between the frequency signal output by the receiving end and the frequency signal at the sending end is uncertain, and it is necessary to determine the frequency in the optical fiber time-frequency transmission. signal phase correction
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[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0024] see figure 1 , a correction device for frequency signal phase in optical fiber time-frequency transmission of the present invention, comprising:
[0025] Transmitter, used to transmit time signal and frequency signal. Specifically, the transmitting end includes: an atomic clock, an optical fiber time synchronization transmitter and an optical fiber frequency transmission transmitter; the time signal output end of the atomic clock is connected with the input end of the optical fiber time synchronization transmitter, and the output end of the optical fiber time synchronization transmitter is used for output Time signal; the frequency signal output end of the atomic clock is connected with the input end of the optical fiber frequency transmission transmitter, and the output end of the optical fiber frequency transmission transmit...
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The invention discloses a device and method for correcting the phase of a frequency signal in optical fiber time-frequency transmission, comprising: a transmitting end for transmitting a time signal and a frequency signal; a receiving end for receiving the time signal and frequency signal sent by the transmitting end, And process the received frequency signal into a time signal, and output the time difference between the time signal obtained by the processing and the received time signal; it is used to receive the phase correction control signal, correct the phase of the frequency signal, and output the corrected synchronous frequency signal; the control unit , used to receive the time difference output by the receiving end and return the phase correction control signal to the receiving end. The invention can realize the correction of the frequency signal phase in the optical fiber time-frequency transmission, and can improve the certainty and reproducibility of the frequency signal phase in the optical fiber time-frequency transmission.
Description
technical field [0001] The invention belongs to the technical field of frequency signal phase in optical fiber time-frequency transmission, in particular to a correction device and method for frequency signal phase in optical fiber time-frequency transmission. Background technique [0002] Long-distance high-precision time-frequency signal transmission plays an important role in the fields of clock comparison, very long baseline interferometry and navigation. However, traditional time-frequency transmission systems (such as long-wave, short-wave, satellite time-frequency transmission systems, etc.) can no longer meet the long-distance transmission performance indicators of today's high-precision atomic frequency standards. On this basis, optical fiber has the advantages of high bandwidth, low loss and strong anti-interference. At the same time, the mature optical fiber communication network has also laid a solid foundation for the use of optical fiber for frequency transmiss...
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IPC IPC(8): H04L7/00
CPCH04L7/0016H04L7/0054H04L7/0079H04L7/0091
Inventor 赵侃陈法喜刘涛张首刚
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI