Multi-frequency multi-point microwave fiber stable-phase transmission method based on passive phase correction

Abstract

The invention discloses a multi-frequency multi-point microwave fiber stable-phase transmission method based on passive phase correction. A central station correspondingly carries out frequency halving on multiple different frequencies of target microwave signals and then coupling the signals into one path which is loaded on an optical signal through modulation for transmission to multiple far-end nodes. For a single far-end node, for example, a far-end node 1, received frequency-halving microwave signal into two paths by a powder divider; one path is subjected to third harmonic generation and the other path is sent back to the central station. At the central station, after other far-end nodes are subjected to the same transmission, obtained microwave signals are coupled with the microwave signal of the far-end node 1. After frequency shift is performed, the obtained signal is transmitted to the far-end node 1 through a wavelength division multiplexer for photoelectric detection and band-pass filtering. An output microwave signal is mixed with a third harmonic generation microwave signal, so a target microwave signal with a stable phase is obtained. According to the invention, time required for phase stabilizing of the microwave is short, quality is high and different frequencies of microwave signals can be transmitted to multiple far-end nodes.

Description

technical field [0001] The invention relates to a microwave signal transmission method, in particular to a multi-frequency multi-point microwave optical fiber phase-stable transmission method based on passive phase correction, and belongs to the technical field of microwave photonics. Background technique [0002] High-quality frequency sources are the core of modern electronic systems, and high-stable frequency standards promote the development of many fields. Microwave photonic technology has the characteristics of small transmission loss, large bandwidth, anti-electromagnetic interference, lightness and flexibility, and easy construction. However, due to the influence of uncontrollable environmental temperature and mechanical stress changes in optical fiber transmission technology, the phase of the signal is random. Drift greatly affects the quality of the microwave signal. This is extremely unfavorable for precise phase feeding in beamforming systems, stable local oscil...

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Problems solved by technology

[0004] In view of the above deficiencies in the prior art, the present invention aims to provide a multi-frequency multi-point microwave optical fiber phase-stabilized transmission method based on passive phase correction, to overcome the disadvantage of slow phase correction speed in traditional phase-stabilized methods and solve the problem of traditional phase-stabilized methods. Defects of single-frequency single-point transmission in phase transmission

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