Four-wave mixing suppression method and device based on piezoelectric effect

Abstract

According to the four-wave mixing suppression method and device based on the piezoelectric effect, in an optical fiber laser amplifier, a signal light input optical fiber or / and a pump light input optical fiber is / are wound on a piezoelectric crystal, and the strain of the piezoelectric crystal is changed by controlling the potential difference between the two ends of the piezoelectric crystal; the length of the signal light input optical fiber or / and the pump light input optical fiber is / are longitudinally stretched, so that the longitudinal length of the signal light input optical fiber or / and the pump light input optical fiber is / are changed, and the optical path difference of signal light in the signal light input optical fiber or / and pump light in the pump light input optical fiber is / are changed; therefore, modulation of the front phase of the signal light or / and the pump light is achieved, the condition of four-wave mixing phase matching is not met, and the purpose of suppressing four-wave mixing in the optical fiber is achieved.

Description

technical field [0001] The invention relates to the technical field of fiber lasers, in particular to a four-wave mixing suppression method and device based on piezoelectric effect. Background technique [0002] Fiber lasers have the advantages of compact structure, high efficiency, good beam quality, stability and ease of use, and are widely used in industry, national defense, medical, basic research and other fields. Raman gain fiber lasers use the stimulated Raman scattering effect in the fiber to generate laser gain, there is no limit to the pump wavelength, and it is not affected by gain saturation, amplified spontaneous emission, and photon darkening effects. It has a wide range of applications in important fields such as generation, acquisition of special-band light sources, and medical treatment. Its biggest feature and advantage is that the wavelength range of the emitted laser is wide. As long as there is a pump laser of a suitable wavelength, laser light can be ge...

AI Technical Summary

Problems solved by technology

[0005] Four-wave mixing is usually harmful in optical fiber communication, especially in wavelength division multiplexing technology, four-wave mixing will cause crosstalk between different channels and channel power imbalance

In a fiber amplifier with nanosecond pulse width, the effect of four-wave mixing will lead to broadening of the output spectrum and affect the purity of the output spectrum

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