Ultrafast RF spectrum measuring method and system

Abstract

The invention discloses an ultrafast RF spectrum measuring method and an ultrafast RF spectrum measuring system based on all-optical Fourier transform and time-domain amplification. The ultrafast RF spectrum measuring method comprises the steps of: fully broadening an ultrashort optical pulse through dispersion to obtain a time-domain spectrum thereof; loading an RF signal to be measured onto the time-domain spectrum through intensity modulation; realizing inverse time-domain Fourier transform through subjecting the modulated time-domain spectrum to dispersion and compression; subjecting an optical signal carrying spectrum information of the signal to be measured in the time domain to time-domain stretching by adopting a time-domain lens magnification technology; and converting the obtained optical signal into an electrical signal, and acquiring accurate spectrum information through scaling and calibration. The ultrafast RF spectrum measuring system comprises a first ultrashort pulse light source, a first dispersion-compensation optical fiber, an MZ intensity modulator, a first single-mode optical fiber, a time-domain lens magnifying system, a photoelectric detector and a real-time oscilloscope. The ultrafast RF spectrum measuring method and the ultrafast RF spectrum measuring system have the advantages of realizing ultrafast RF spectrum measurement while ensuring high spectral resolution, having measurement frame rate up to 100 MHz, and are of great significance in application scenarios such as dynamic spectrum monitoring and transient spectrum capturing.

Description

technical field [0001] The invention relates to the technical field of radio frequency spectrum analysis, in particular to an ultrafast measurement method and system for radio frequency spectrum. Background technique [0002] Radio frequency spectrum analysis technology has a wide range of applications in wireless communication, radar system, radio astronomy and many other fields. At present, the research on RF spectrum analysis technology is mainly developing in three directions: high resolution, high bandwidth and high measurement rate. Traditional electronics-based RF spectrum analysis technology can achieve ultra-high spectral resolution, but due to the existence of electronic bottlenecks, it is difficult to achieve ultra-large bandwidth and ultra-fast measurement rate. In recent years, with the rapid development of microwave photonics, photon-assisted RF analysis methods have been extensively studied. With the help of the large bandwidth and high speed of optics, phot...

AI Technical Summary

Problems solved by technology

Through the analysis of the existing technology, it can be found that the current radio frequency spectrum measurement technology is difficult to achieve ultra-fast measurement rate while ensuring high resolution

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