Time-frequency standard signal fusion transmission system and transmission method

Abstract

A time-frequency standard signal fusion transmission system and transmission method are provided. The system compensates the phase noise of optical frequency signal, radio frequency signal and time signal when they are transmitted in the optical fiber link through the compensation module 1, the compensation module 2 and the communication signal transmitter of the local terminal, and sends the calculated link delay to the remote terminal together with the communication data. Through the optical frequency and RF reference signal output module at the remote end, The time signal output module andthe communication signal receiver, the spectrum purification of the optical frequency standard signal, the spectrum purification of the radio frequency standard signal and the time delay calibration of the time signal are realized, so that the user can simultaneously obtain the high-quality optical frequency standard signal, the radio frequency standard signal, the time signal and the communication data signal. The technical scheme of the invention solves the problems of mutual crosstalk and low detection signal-to-noise ratio when a plurality of signals are simultaneously transmitted, and greatly improves the transmission distance and transmission accuracy of the transmission of the plurality of standard signals.

Description

technical field [0001] The invention relates to the technical field of time-frequency standard signal transmission, in particular to a fusion transmission system and method of an optical frequency standard, a radio frequency standard, a time signal and a data signal. Background technique [0002] High-precision and accurate time-frequency standards are common basic issues and core key technologies in major infrastructure construction and cutting-edge scientific research such as precise punctuality and timing, precise navigation and positioning, radar networking, deep space exploration, and mobile communications. . [0003] These time-frequency standards include rubidium or cesium atomic fountain clocks in the radio frequency domain. After continuous development in recent years, the uncertainty of their frequency has reached 10 -16 order of magnitude. In the field of optical frequency, the frequency stability and uncertainty of optical atomic clocks such as lattice clocks a...

AI Technical Summary

Problems solved by technology

However, the use of optical combs for time-frequency standard signal transmission has the following problems: 1) Mode-locked lasers need to be used, and the cost is high; 2) The delay of the optical fiber needs to be adjusted so that the local pulse chain and the return pulse chain are properly overlapped; Dispersion is strictly controlled; 4) The remote end does not perform spectral purification; 5) It is impossible to transmit 1pps time reference signal at the same time

[0007] As mentioned above, both the existing transmission scheme based on intensity modulation and direct detection and the transmission scheme based on femtosecond optical frequency comb have some defects, so that the time-frequency standard signals in the radio frequency domain and the optical frequency domain cannot be simultaneously fused and transmitted to the remote user

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