Injection spectrum detection system based on Fourier domain mode-locking photoelectric oscillator

Abstract

An injection spectrum detection system based on a Fourier domain mode-locking photoelectric oscillator comprises a swept source, a phase modulator, an optical filter, an energy storage fiber, a photodetector, a first power splitter, a power amplifier, a second power splitter, a measured signal source and an oscilloscope, wherein the swept source, the phase modulator, the optical filter and the photodetector together constitute a tunable microwave photon filter; the variation period of the microwave photonic filter matches the delay of the signal transmitting in a photoelectric oscillator loopfor one week to satisfy the Fourier domain mode locking, so that the Fourier domain mode-locking photoelectric oscillator works near the oscillation threshold, that is, all modes do not start vibration. When the measured signal is injected into the Fourier domain mode-locking optoelectronic oscillator loop, the frequency components contained in the measured signal will start to vibrate, the oscilloscope records the vibration starting time of these frequency components, and the frequency and amplitude information of the measured signal can be determined by the correspondence between the sweep output frequency and time of the oscillator and the signal amplitude.

Description

technical field [0001] The invention relates to the technical field of microwave photonics, in particular to an injection spectrum detection system based on a Fourier domain mode-locked photoelectric oscillator. Background technique [0002] In communication, satellite monitoring, aerospace and other application fields, the spectrum detection system is a necessary general-purpose testing tool. With the rapid development of communication technology and military electronic technology, people pay more and more attention to the spectrum detection system which can realize wideband fast spectrum analysis. [0003] At present, the spectrum detection technology is mainly implemented by a spectrum analyzer based on electronic technology. In principle, spectrum analyzers can be divided into three categories: the first category is based on Fourier transform, that is, the signal waveform to be detected is digitized by sampling, and the frequency domain signal is obtained by Fourier tra...

AI Technical Summary

Problems solved by technology

A high-performance swept-frequency heterodyne spectrum analyzer requires multiple frequency conversions and multiple sets of IF filters and mixers to complete signal acquisition and processing, which increases the cost and complexity of the system

[0004] It can be seen that the existing spectrum analysis equipment has more or less certain disadvantages, and it is necessary to develop a spectrum analysis equipment that is more convenient to use

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