Microwave instantaneous frequency measuring device based on optical frequency comb

Abstract

The invention provides a microwave instantaneous frequency measuring device based on an optical frequency comb, which comprises an optical comb generating module, a signal modulation and optical combphase shifting module and a dispersion and wavelength division module, wherein the optical comb generating module comprises an optical comb generator used for generating an optical frequency comb; thesignal modulation and optical comb phase shifting module is connected with the optical comb generating module and is used for modulating a signal to be measured onto each comb tooth of an input optical frequency comb of the optical comb generating module and introducing different phase shifts to each comb tooth of the optical frequency comb; the dispersion and wavelength division module is connected with the signal modulation and optical comb phase shifting module and is used for integrally introducing phase shift to the optical frequency modulated by the signal to be measured and output by the signal modulation and optical comb phase shifting module, and separating optical frequency combs with different frequency components by a wavelength interval to obtain the frequency value of the signal to be measured. According to the invention, the working bandwidth is effectively expanded, the response speed is fast, and the measurement precision is high.

Description

technical field [0001] The present disclosure relates to the field of microwave photonics, in particular to a microwave instantaneous frequency measuring device based on an optical frequency comb. Background technique [0002] The future electronic warfare environment is populated by microwave signals that vary over a wide frequency spectrum and are short in duration. Intercepting these signals and quickly identifying their frequency, amplitude and other parameters are of great significance to the subsequent analysis of the information carried in the signals. Therefore, the rapid measurement of microwave signal frequency has an extremely important position in future electronic warfare. The traditional electrical scheme mainly adopts the superheterodyne instantaneous frequency measurement method for frequency measurement, and the typical method is the search superheterodyne method. It is composed of antenna, low-noise amplifier, band-pass filter, mixer, tuning control circu...

AI Technical Summary

Problems solved by technology

There are also some instantaneous frequency measurement schemes based on microwave photons, but the accuracy of these schemes often decreases when the frequency measurement range is large, and cannot be adapted to scenarios that require high precision.

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