2um band tunable random fiber laser based on phase shift grating

Abstract

The invention discloses a um band tunable random fiber laser based on a phase shift grating and belongs to the technical field of fiber laser. The 2um band tunable random fiber laser comprises a pumplaser source, a fiber coupler, an optical circulator, an optical wavelength division multiplexer, an erbium-doped fiber, a temperature adjustable box and the phase shift grating. The amplification effect of the erbium-doped fiber is used, the e threshold power of the laser is reduced, and 2 um band random laser output is achieved. A bidirectional pumping mode is used, the output power of a randomlaser is improved, the temperature adjustable box is used to control the spacing of the phase shift grating, and tunable features are realized. The generated random laser is outputted through the fiber coupler.

Description

technical field [0001] The invention relates to a random fiber laser, in particular to a 2 μm band tunable random fiber laser based on a phase shift grating, and belongs to the technical field of fiber lasers. Background technique [0002] Random fiber lasers mainly use the Rayleigh backscattering in the fiber to achieve random distributed feedback. Since the Rayleigh backscattering is relatively weak, most random fiber lasers now use the stimulated Raman effect in the fiber to amplify the optical signal, but Random fiber lasers based on the stimulated Raman effect have disadvantages such as high laser threshold power, low conversion efficiency, few output wavelengths, and non-tunability. Therefore, it is proposed to use fiber doped with rare earth elements to improve random feedback and reduce threshold power. However, at present, most random lasers have output wavelengths around 1550nm, and their application range is limited, and they do not have tunable functions. Conte...

AI Technical Summary

Problems solved by technology

[0002] Random fiber lasers mainly use the Rayleigh backscattering in the fiber to achieve random distributed feedback. Since the Rayleigh backscattering is relatively weak, most random fiber lasers now use the stimulated Raman effect in the fiber to amplify the optical signal, but Random fiber lasers based on the stimulated Raman effect have disadvantages such as high laser threshold power, low conversion efficiency, few output wavelengths, and non-tunability

Therefore, it is proposed to use rare-earth-doped optical fibers to improve random feedback and reduce threshold power. However, at present, most random lasers have output wavelengths around 1550nm, and their application range is limited, and they do not have tunable functions.

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