Photoelectric oscillator based on optical resonant cavity

Abstract

The invention discloses a photoelectric oscillator based on an optical resonant cavity, and aims to carry out photoelectric oscillation on laser so as to generate high-quality microwave signals. The photoelectric oscillator consists of a laser, a photoelectric modulator, an amplifier, a filter, a photoelectric detector and an optical resonant cavity which form a loop, wherein the loop forms the main structure of the photoelectric oscillator. The photoelectric oscillator disclosed by the invention has outstanding advantages in generating high-quality microwave signals in a light domain, and high-quality microwave signals can be formed through multiple times of oscillation; the optical resonant cavity is adopted to output the microwave signals through multiple times of oscillation, and the invention mainly aims to minimize the photoelectric oscillator; the optical resonant cavity is adopted to replace conventional long optical fibers, so that the photoelectric oscillator has the characteristics of small size, low consumption, stable performance and the like, and is applicable to the field of radio wireless communication and microwave photonics; the optical resonant cavity is realized through coupled prisms and micro disc cavities and thus is relatively stable in property when being compared with an optical resonant cavity realized through coupled waveguide and micro discs.

Description

technical field [0001] The invention relates to a photoelectric oscillator, in particular to a photoelectric oscillator based on an optical resonant cavity, and belongs to the technical field of microwave and optoelectronics. Background technique [0002] Optoelectronic oscillator (OEO: Optoelectronic oscillator) is a high-performance microwave signal generating device. Relying on the development of microwave photonics, optoelectronic oscillators use optoelectronic feedback loop technology to convert laser energy into microwave signal energy. Compared with traditional oscillators, optoelectronic oscillators have extremely low phase noise, and get rid of the limitation that the phase noise performance of traditional microwave oscillators will decrease with the increase of frequency, and can output stable low noise in both optical and electrical forms signal, becoming a new type of high-quality microwave signal source. The optoelectronic oscillator not only has a certain tun...

AI Technical Summary

Problems solved by technology

But the current long fiber optic oscillator has certain defects: 1) High Q value and single-mode output are contradictory

2) External environmental factors such as temperature, mechanical vibration, etc. will affect some optoelectronic devices and loop length of the optoelectronic oscillator

3) The discrete optoelectronic devices of optoelectronic oscillators are not easy to miniaturize, which limits the practical application of optoelectronic oscillators

4) The feedback loop composed of long optical fibers will generate a large number of side modes with small frequency intervals, resulting in gain competition between side modes and main modes, but these side mode noises are difficult to filter out by point filters

Images