Multi-path microwave phase stable transmission method and device

Abstract

The invention belongs to the field of microwave radio frequency, and particularly relates to a multi-path microwave phase stable transmission method and device. By aiming at the problems in the prior art, the invention provides the multi-path microwave phase stable transmission method and device. Wavelength division multiplexers are adopted, and a double-wavelength vector method is used for completing the stable phase transmission of single-path microwave signals. If the path number of the wavelength division multiplexers is N (N is an even number), the stable phase transmission of N / 2 paths of microwave signals can be realized. Fourth microwave modulation optical signals of light carriers Lambda2 are separated out through the first wavelength division multiplexer, and phase error signals between the other path of microwave signals output by a first power divider and the fourth microwave modulation light signals of the light carriers Lambda2 separated out by the first wavelength division multiplexer are extracted out through a feedback unit; the feedback unit sends the phase error signals into the regulating end of the phase correcting unit, and a whole optical fiber transmission link is subjected to phase compensation, so that stable phase transmission of signals between the microwave input signals and the microwave output signals can be realized.

Description

technical field [0001] The invention belongs to the field of microwave radio frequency, in particular to a method and device for multi-channel microwave phase stable transmission. Background technique [0002] In a distributed receiving system, in order to ensure the phase characteristics of the central station and each node end, it is necessary to stably transmit the phase of the microwave signal from the central station to each node end. like figure 1 Shown is the working principle of optical fiber stabilized phase transmission. Assuming that the initial phase of the input microwave signal is , the phase disturbance brought by the long-distance optical fiber is , and the phase change of the phase adjustment unit is . The phase detection unit adjusts the pair through the phase adjustment unit through the difference between the comparison sum. When it is satisfied, the phase of the microwave signal at the node, at this time, the phase of the node end is consistent with th...

AI Technical Summary

Problems solved by technology

[0004] In the traditional method, the entire optical fiber link adopts single-wavelength transmission, and the central station needs to use complex phase detection methods such as frequency mixing and filtering. The system is complex and the scalability is not strong. It is only suitable for stable phase transmission of single-channel microwave signals.

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