Microwave frequency measurement method based on double optical frequency combs and stimulated Brillouin scattering

Abstract

The invention relates to a high-precision multi-microwave frequency measurement method based on double optical frequency combs and stimulated Brillouin scattering, and the method comprises the steps: generating two paths of coherent optical frequency combs through employing the same laser, and enabling the two paths of coherent optical frequency combs to serve as optical carriers to be inputted into two double-parallel Mach-Zehnder modulators; and carrier suppression single side band modulation is carried out on the microwave signal to be measured and the scanning signal. The two paths of modulated optical signals are respectively used as signal light and pump light to be input into the stimulated Brillouin scattering effect structure, then the optical comb teeth are decomposed through the optical demultiplexer, and the frequency value of the signal to be measured can be estimated by measuring the power value of the optical signal output by each channel. In order to further improve the algorithm precision, an amplitude comparison function is established by using the measured optical power value to calculate a frequency measurement error, and frequency precise measurement can be realized by performing error correction on the frequency measurement value. By adopting the method, high-precision frequency measurement of a plurality of microwave signals can be realized, and the method has wide application value 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 high-precision multi-microwave frequency measurement method based on dual optical frequency combs and stimulated Brillouin scattering. Background technique [0002] Microwave signal parameter measurement is widely used in military and civilian fields such as communication, radar, and space perception, and frequency is one of the important parameters for sensing and evaluating microwave signals. It is used in electronic warfare receivers, radar early warning receivers, and spectrum monitoring There is an important demand in such equipment. Traditional microwave frequency measurement uses electrical domain signal processing technology, which has the advantages of high resolution and high flexibility. However, with the rapid development of microwave technology and the expansion of application fields, the operating f...

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Problems solved by technology

In addition, based on dual optical frequency combs, the flexible adjustment of scanning speed, scanning bandwidth and frequency resolution can be realized by using wavelength division multiplexing and time division multiplexing. However, this solution still requires a high-speed ADC, and the implementation cost is high.

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