A frequency transmission system and method with post-compensation system

Abstract

The invention discloses a compensation system rear-mounted frequency transmission system, comprising a transmitting device and one or a plurality of receiving compensation devices. The transmitting device is used for modulating a frequency signal with the phase locked at a reference frequency source to a light signal, and transmitting, through one or a plurality of optical fiber links, the frequency signal to one or a plurality of receiving compensation devices arranged at a receiving end. The receiving compensation device is used for receiving the frequency signal with optical fiber link phase noise from the transmitting device, taking the frequency signal as a first auxiliary compensation signal, loading a microwave signal generated by a frequency oscillator to the light signal to be transmitted by the optical fiber link and demodulated so as to obtain a second auxiliary compensation signal comprising the same phase noise as the first auxiliary compensation signal, generating a phase compensation signal on the basis of the first and second auxiliary compensation signals, performing feedback control on the phase of a signal output by the frequency oscillator, and reproducing a frequency signal with the phase locked at a frequency transmitting source. Through adoption of the system, the transmitting device can be simplified, and the problem of complication of co-transmitting terminal transmitting device probably caused by multilink parallel transmission of the frequency signal can be solved.

Description

technical field [0001] The invention relates to the technical field of frequency transmission, in particular to a frequency transmission system and method with a post-compensation system. Background technique [0002] The frequency transmission system is mainly used to release the frequency signal accurately and stably. The existing frequency transmission systems and transmission methods mainly use satellite or optical fiber as the transmission medium. Another authorized patent of the applicant of the present invention "Atomic Time Signal Transmission System and Transmission Method" (patent application number: CN201110186493.9) introduces a frequency signal transmission system and method that realizes ultra-long baseline (distance) through optical fiber. The system adopts the method of actively compensating the phase noise of the optical fiber link. Its main principle is to actively detect and pre-compensate the phase noise introduced by optical fiber transmission at the tr...

AI Technical Summary

Problems solved by technology

This technology has a high transmission stability, but there is a big limitation for large-scale networking applications - its transmission mode is only suitable for point-to-point transmission, and each additional transmission path needs to add a set of transmission equipment

At the same time, since the main phase noise compensation function is completed by the transmitter, for the case where the frequency signal is transmitted from the frequency transmitter to multiple receivers, the phase transmitter compensation device will be concentrated on the transmitter, and will increase with the increase in the number of users, and then Causes problems such as complicated transmitter equipment and limited scalability

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