Double-ring optoelectronic oscillator with stable self polarization state

Abstract

The invention belongs to the field of microwave photonics, and discloses a double-ring optoelectronic oscillator with a stable self polarization state. The double-ring optoelectronic oscillator comprises a light source, a light modulator, a double-ring structure and a photoelectric loop. The light input end of the light modulator is connected with the light source and is used for receiving a continuous light wave signal. The light input end of the double-ring structure with the stable self polarization state is connected with the light output end of the light modulator. The light output end ofthe double-ring structure is connected with the photoelectric loop. The output end of the photoelectric loop is connected with the power input end of the light modulator. Therefore a double-ring optoelectronic oscillation circuit which operates in a resonant frequency and has advantages of stable polarization state and compact structure is formed. The double-ring optoelectronic oscillator has better edge mold suppression ratio and furthermore can enlarge a loop Q factor. The double-ring optoelectronic oscillator has advantages of realizing the double-ring structure with the stable self polarization state by means of a 45-DEG Faraday rotating mirror and a reflective structure, greatly improving system stability without additional electric field devices, reducing fiber length by one half, realizing more compact integral structure, and satisfying a requirement for high stability of the signal in a modern microwave system.

Description

technical field [0001] The invention belongs to the field of microwave photonics, and more specifically relates to a double-ring photoelectric oscillator with stable self-polarization state. Background technique [0002] High-purity microwave and millimeter-wave signals are widely used in radar, high-speed signal processing and optical wireless communication systems. Current solutions for generating such ultra-low phase noise microwave and millimeter waves are mainly based on optoelectronic oscillators. The optoelectronic oscillator achieves ultra-high energy storage through the low loss characteristics of the optical fiber, so that the optoelectronic oscillator has an ultra-high Q factor, and the generated microwave signal has ultra-low phase noise. [0003] A common single-ring structure optoelectronic oscillator consists of a laser, an intensity modulator, an optical fiber, a photodetector, an electrical filter, and an electrical amplifier. The longer the optical fiber,...

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a dual-loop photoelectric oscillator with self-polarization stabilization, aiming at solving the problem of light in the two loops of the dual-loop photoelectric oscillator based on polarization multiplexing technology in the prior art. The polarization state is easily affected by environmental factors, resulting in coupling output optical power jitter, which greatly affects the performance and stability of the optoelectronic oscillator

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