Microwave frequency measurement method based on double optical frequency combs and Fabry-Perot filter

Abstract

The invention relates to a microwave frequency measurement method based on double optical frequency combs and a Fabry-Perot filter. The method comprises the following steps: modulating a multi-frequency microwave signal to be measured on an optical frequency comb, and carrying out channelized filtering on the modulated optical signal through a Fabry-Perot filter. Signals output by the filter are coupled with the other optical frequency comb, channelized receiving is achieved through an optical demultiplexer, and meanwhile beat frequency and narrow-band filtering are carried out on signals output by all channels. The coarse measurement of the frequency of the microwave signal to be measured can be realized by measuring the power of the microwave signal output by each channel. And then, sampling and processing the signal of the target channel, and realizing frequency precise measurement through calculation. The method can realize real-time measurement of high-precision frequency of a plurality of microwave signals, and has a wide application prospect in the aspects of communication, radar, electromagnetic spectrum sensing and the like.

Description

technical field [0001] The present application relates to the technical field of microwave photonics and microwave signal frequency measurement, in particular to a microwave frequency measurement method based on dual optical frequency combs and Fabry-Perot filters. Background technique [0002] Microwave photonics is a technology that uses optical technology to generate, transmit, and process microwave signals. Compared with traditional electrical domain processing technologies, microwave photonics has the advantages of large bandwidth, low loss, small weight and volume, and anti-electromagnetic interference. Therefore, it has broad application prospects in high-speed wireless communication, radar, electronic warfare and other fields. In addition, for many application fields such as radar, electronic warfare, and deep space exploration, the receiver is required to be able to scan, identify and analyze unknown signals in a very large frequency range, which requires the receiv...

AI Technical Summary

Problems solved by technology

This scheme can realize a wide range of frequency measurement, but requires high-precision dispersion media and optical filters, the system scheme is complex, and the real-time performance of frequency measurement is not good

In addition, the four-wave mixing scheme can achieve frequency measurement in a large frequency range, but the measurement accuracy is poor, and the error can reach hundreds of MHz

Stimulated Brillouin scattering can be used to achieve high-precision frequency measurement on the order of MHz, but most solutions rely on frequency sweep signals or adjustable optical signals to achieve multi-microwave frequency measurement in a large frequency range, which has poor real-time performance and is easy to Misses transient signals that change rapidly, which is unacceptable for radar, electronic warfare, etc.

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