Electric gain frequency-selecting cavity-based frequency tunable optoelectronic oscillator system

Abstract

The invention discloses an electric gain frequency-selecting cavity-based frequency tunable optoelectronic oscillator system. A single-loop OEO (optoelectronic oscillator) is combined with an electricgain frequency-selecting cavity formed by a microwave filter, electric attenuators, an electric phase shifter and the like; the signals of the electric gain frequency-selecting cavity can be locked to the electric injection of the free oscillation signals of the OEO, so that the output of system signals can be realized; the frequency of the output signals is determined by the electric gain frequency-selecting cavity for locking the mode of the OEO; the bias voltage of the electric phase shifter is adjusted, so that the frequency of microwave signals outputted by the electric frequency-selecting cavity can be changed; an optical delay line is adjusted, so that the oscillation starting mode of the single-loop OEO can be changed; the electric phase shifter and the optical delay line can be adjusted, so that the frequency tuning of the output signals can be adjusted; and the electric attenuators can be adjusted, so that the loop cavity gain of the OEO can be matched with the electric gainfrequency-selecting cavity, so that a side mode can be effectively restrained. The system is simple in structure. According to the system, the advantage of the low-phase noise of the single-loop OEOis reserved, the side mode can be effectively suppressed, and a new implementation method is provided for the frequency tunable OEO.

Description

technical field [0001] The invention relates to a frequency tunable photoelectric oscillator system based on an electric gain frequency selective cavity. Background technique [0002] High-performance microwave sources are the basis of all microwave applications, and their phase noise, spectral purity, and stability directly affect the performance of electronic equipment in aerospace, instrumentation, radar, and many other fields. With the improvement of application requirements, the noise performance of traditional microwave sources is approaching the limit. The optoelectronic oscillator (OEO) is a new type of microwave signal generator with high spectral purity, and its Q value is as high as 10 10 It is an ideal high-performance microwave oscillator that can generate microwave signals with a frequency up to hundreds of GHz and a phase noise lower than -160dBc / Hz@10kHz. [0003] In various applications such as frequency division multiplexing and radar detection required f...

AI Technical Summary

Problems solved by technology

[0005] In view of the above prior art, the present invention proposes a frequency tunable optoelectronic oscillator system based on an electrical gain frequency selective cavity, which solves the problem that the existing tunable microwave source technology cannot simultaneously satisfy low phase noise and high side mode suppression ratio, The system structure of the present invention is simple and easy to realize, and fine tuning can be realized by controlling the electric phase shifter and the optical delay line, while not only retaining the advantages of OEO low phase noise, but also effectively suppressing side modes, and having high system stability, The invention can be used as a stable signal generator for generating high-quality tunable output signals

Images