Microwave frequency measuring method based on optical power detection and device thereof

Abstract

The invention discloses a microwave frequency measuring method based on optical power detection and a device thereof, which conducts real-time measurement on microwave frequency by adopting a system consisting of an electro-optical modulating module and a frequency demodulating module. A continuous microwave signal is loaded on a continuous light source in the modulating module in the modulating manner of carrier suppressed small signals, and only generates two plus or minus 1 stage optical margin strips; the modulated optical signal is divided into two paths, wherein one path is injected into a comb-like filter with sine-function transmission spectrum while the other path is injected into a tunable optical attenuator; the output optical power of the two paths are detected and compared with each other and the microwave frequency is obtained from the demodulation of power ratio. The invention lowers the complexity and cost of the system, eliminates the influence of fluctuation of output power of the light source on the measurement of the frequency and enlarges the measuring frequency band of frequency linear demodulation.

Description

technical field [0001] The invention relates to the field of communication and signal processing, in particular to a photon technology type real-time microwave frequency measurement method. Background technique [0002] Real-time microwave frequency measurement is an important content in the field of military and civilian microwave communication and signal processing, involving frequency tracking, communication monitoring, etc. Most of the early microwave frequency measurement techniques were based on electronic techniques, such as electric spectrum analyzers. Electron spectrum analyzers work in a scanning mode. When the existence time of the microwave signal to be measured is less than one scan period, the spectrum analyzer cannot normally obtain its frequency information. However, in some important fields (such as electronic warfare), the communication or signal is very sudden and exists for a short time, and the scanning mode frequency measurement method is difficult to...

AI Technical Summary

Problems solved by technology

Although this scheme only needs a low-speed optical detector or optical power meter, this measurement scheme requires two continuous light sources, and the complexity and cost of the system are still high. In addition, the fluctuation of the output power of the two continuous light sources will affect the frequency measurement. Negative impact; the correspondence between the optical power ratio and the microwave frequency is a tangent function shape, and the broadband with linear frequency demodulation band is limited

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