High-quality time domain mode-locked optoelectronic oscillator system and method based on Brillouin effect

Abstract

The invention relates to the technical field of microwave photon signal generation, in particular to a high-quality time domain mode-locked optoelectronic oscillator system and method based on the Brillouin effect. A laser outputs an optical signal to a phase modulator, an optical isolator protection device is arranged, and the signal is output to an optical circulator; the optical circulator receives a signal input by the pump laser and outputs the signal to the optical attenuator, and the optical attenuator reduces signal energy and sends the signal energy to the photoelectric detector; the photoelectric detector converts an optical signal into a microwave signal, the loss is compensated by the electric amplifier, and the microwave signal is sent to the first electric coupler; after the first electric coupler receives signals, one path of signals is transmitted to the electric spectrum analyzer and the digital storage oscilloscope to be stored, and the other path of signals is sent to the second electric coupler, receives external radio frequency signals and inputs the signals to the phase modulator to close a loop. Conversion from phase modulation to intensity modulation is realized, an optical filter structure in the system is simplified, time domain mode locking operation is introduced, and a broadband frequency comb microwave signal can be adjusted.

Description

technical field [0001] The invention relates to the technical field of microwave photonic signal generation, in particular to a high-quality time-domain mode-locked photoelectric oscillator system and method based on the Brillouin effect. Background technique [0002] The advantages of optoelectronic oscillators (OEO) in generating microwave signals with high frequency, low phase noise, high spectral purity and high stability are widely used in radar sensing, signal processing and communication systems, etc. The quality factor characteristic can generate microwave signals with ultra-low phase noise; however, although the device can generate microwave signals with high frequency and low phase noise, the resulting waveform is continuous in the time domain. In radar detection, high-power pulsed microwaves are used for detection; in ground penetrating radar or life detection radar, microwave pulses with narrow time and wide bandwidth are used. [0003] Time-domain mode-locking ...

AI Technical Summary

Problems solved by technology

It is used to overcome that the waveform of the photoelectric oscillator in the prior art is continuous in the time domain, and microwave pulse signals with different repetition frequencies cannot be generated according to the frequency of the injected signal, which is not conducive to frequency tuning and generation of large-bandwidth frequency comb microwave signals , still need to use fiber grating, there are some restrictive problems in use

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