High precision distributed optical fiber frequency transmission method

Abstract

The invention discloses a high-precision distributed optical fiber frequency transfer method. Local transferred frequency signals are subjected to frequency halving and then serve as detection signals, the signals are transmitted back and forth between the local end and a remote end through bidirectional wavelength division multiplexing, and detection signals comprising optical fiber link phase noise are obtained at the local end; the returned detection signals and the local transferred frequency signals are subjected to frequency mixing and filtering to obtain phase conjugation signals, and the phase conjugation signals are transmitted to the optical fiber link through another wavelength channel; all users detect forward conjugation signals and backward detection signals, and stable frequency signals are obtained through frequency mixing; and the remote end carries out frequency mixing on the received forward phase conjugation signals and the forward detection signals to obtain stable frequency signals. Influences on frequency transfer short-term stability by backscattering noise can be avoided; the users share the same wavelength, and the fiber frequency long-term stability influences and the cost due to increasing of users can be reduced; and by adopting passive compensation, the method has the advantages of relatively simple and unlimited dynamic range and quick compensation.

Description

technical field [0001] The invention relates to the technical field of optical fiber time-frequency transmission, in particular to a distributed optical fiber frequency transmission method. Background technique [0002] In recent years, with the continuous development of science and technology, the stability of atomic frequency standards has been greatly improved. At the same time, many fields such as deep space exploration, particle accelerators, navigation and communication, and defense applications such as array radars have an increasing demand for high-stability frequency sources and long-distance frequency synchronization. However, these high-stable frequency sources are very expensive, usually huge in size and need to operate in an ideal environment, so long-distance transmission of high-stable frequency signals and long-distance signal synchronization are of great significance. [0003] Traditional frequency transmission schemes mainly include frequency transmission ...

AI Technical Summary

Problems solved by technology

In order to achieve a high-performance and low-cost solution, we need to solve problems such as backscattering, symmetry, and system complexity. Existing solutions basically fail to take care of these aspects at the same time

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