Injection Spectrum Detection System Based on Fourier Domain Mode-locked Photoelectric Oscillator

Abstract

An injection spectrum detection system based on a Fourier-domain mode-locked photoelectric oscillator, including a frequency-sweeping light source, a phase modulator, an optical filter, an energy storage fiber, a photoelectric detector, a first power divider, an electrical amplifier, The second power splitter, the measured signal source and the oscilloscope; wherein the frequency-sweeping light source, the phase modulator, the optical filter, and the photodetector together form a tunable microwave photon filter, and the change cycle of the microwave photon filter is in line with the signal The one-cycle delay in the optical oscillator loop is matched to meet the Fourier domain mode-locking, so that the Fourier domain mode-locked optical oscillator works near the oscillation threshold, that is, all modes do not start to oscillate. When the test signal is injected into the loop of the Fourier domain mode-locked photoelectric oscillator, the frequency components contained in the test signal will start to vibrate, and the oscilloscope will record the start-up time of these frequency components, and output the corresponding relationship between frequency and time through the oscillator frequency sweep And the signal amplitude can determine the frequency and amplitude information of the signal under test.

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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