Tunable optoelectronic oscillator and method based on random Brillouin fiber laser

Abstract

A tunable ultra-narrow linewidth optoelectronic oscillator based on a random Brillouin fiber laser is provided, comprises a first tunable laser (1), a second tunable laser (2), a coupler (3), a beam splitter (4), an intensity modulator (5), an erbium-doped fiber amplifier (6), a first circulator (7), a highly nonlinear optical fiber (8), a second first circulator (9), a single-mode optical fiber (10), a photodetector (11), a power divider (12) and a phase-locked loop system (13) which constitute a real-time feedback system so that the two lasers emitted by the two tunable lasers have a fixed and stable phase difference. The microwave signal with adjustable center frequency and narrow linewidth can be generated by using the modulating characteristic of intensity modulator, nonlinear characteristic of high nonlinear fiber, feedback characteristic of single mode fiber, wavelength tunable characteristic of tunable laser and microwave generation performance of photoelectric oscillator.

Description

technical field [0001] The present disclosure relates to the technical field of microwave photonics, in particular to a tunable ultra-narrow linewidth photoelectric oscillator and method based on a random Brillouin fiber laser. Background technique [0002] High-quality microwave sources are widely used in many fields, such as in the communication industry, phased array radar systems, and remote distributed antennas. Among them, the method of microwave photonics to generate microwave signals has the advantages of large bandwidth and low phase noise. One of the methods to directly generate microwave signals is the optical heterodyne method, which uses two laser beams with the frequency difference we need to generate microwaves. In this method, the line width and frequency drift of the two laser beams will be directly reflected on the generated microwave signal. Another method is to use a photoelectric oscillator to generate a microwave signal. The photoelectric oscillator can...

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Problems solved by technology

A method of generating microwave signals based on random Brillouin fiber lasers has been proposed before. This method can generate microwave signals with extremely narrow linewidth (3dB bandwidth less than 10Hz), but based on the instability of stimulated Brillouin scattering, The generated microwave signal is also extremely unstable, and it is difficult to obtain specific applications.

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