Multi-node high-precision frequency synchronization method and system based on optical fiber network

Abstract

The invention discloses a multi-node high-precision frequency synchronization method and system based on optical fiber network. A bidirectional half-duplex mode of wavelength optical signal is adoptedto measure the time deviation between master and slave nodes, a compensation value is obtained according to the compensation algorithm, and the compensation value is used to compensate the time delayof the frequency signal received by the slave node through another wavelength optical signal, so that the frequency signal of the slave node and the frequency signal of the master node can keep high-precision synchronization, and the purpose of high-precision frequency synchronization of multiple nodes can be realized. The time deviation between master and slave nodes can be measured by using thesame wavelength bidirectional half-duplex optical signal, which can eliminate the asymmetry of time delay caused by temperature and other environmental factors in the process of bidirectional transmission of different wavelengths in the traditional measurement method, so as to improve the accuracy of time deviation measurement between master and slave nodes.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a multi-node high-precision frequency synchronization method and system based on an optical fiber network. Background technique [0002] With the continuous development of communication, navigation, astronomical observation, electric power and transportation systems, and scientific research, the synchronization quality of frequency signals is also required to be higher and higher, and the demand for multi-node high-precision frequency synchronization is also stronger. For example, in astronomical observation, the antenna array of the astronomical telescope needs a highly stable frequency signal to ensure the synchronization of reception; multi-base radar sites also need high-precision frequency synchronization to improve the accuracy of detection. [0003] Optical fiber has the advantages of high bandwidth, low loss, long transmission distance, and strong anti-interference...

AI Technical Summary

Problems solved by technology

[0006] 1. Because the optical fiber link is easily affected by the environment, the optical path of the optical signal passing through the optical fiber changes, which causes the delay change of the frequency synchronization signal transmitted through the optical fiber

[0007] 2. Since the time delay of an optical signal in an optical fiber link is related to environmental changes (especially temperature) and the length of the optical fiber, when the temperature changes greater, the length of the optical fiber affected by the temperature becomes longer, and the time delay of the signal transmitted through the optical fiber also changes. The larger the , the greater the delay that needs to be compensated, but the compensation range of the signal delay compensation device is limited and cannot meet all delay compensation requirements

[0008] 3. In optical fiber links, optical signals of different wavelengths are usually used for two-way transmission to measure the time deviation between the master and the slave. However, when optical signals of different wavelengths are transmitted in the same optical fiber, the time delay changes caused by changes in environmental factors such as temperature are different, so there is asymmetry in the time delay of two-way transmission signals of different wavelength optical signals, which will adversely affect the measurement accuracy of the time deviation between the master and slave nodes

However, the number of nodes passed between the master and slave nodes will affect the synchronization accuracy. The more nodes passed, the lower the synchronization accuracy will be.

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