Multiple wavelength convertible tunable fiber laser based on tapered fiber

Abstract

The invention provides a multiple wavelength convertible tunable fiber laser based on a tapered fiber. The multiple wavelength convertible tunable fiber laser is characterized by comprising a semiconductor laser with a tail fiber, a WDM (wavelength division multiplexer), a single-mode EDF (Erbium-Doped Fiber), a fiber optic isolator, a fiber optic coupler, a fiber optic polarization controller, and a tapered fiber and tuning unit, wherein the tail fiber of the semiconductor laser is connected with the pumping end of the WDM, the output end of the WDM is connected with the output end of the fiber optic isolator through the EDF, the input end of the fiber optic isolator is connected with a port, at which the light splitting coupling ratio is 9, of the fiber optic coupler, a port, at which the light splitting coupling ratio is 1, of the fiber optic coupler is a laser output port, the input end of the fiber optic coupler is connected with the tapered fiber and tuning unit through the fiber polarization controller, the other end of the tapered fiber and tuning unit is connected with the signal port of the WDM, so as to form a closed ring cavity. The multiple wavelength convertible tunable fiber laser based on the tapered fiber, which is provided by the invention, has the advantages of simple method, low cost, compact structure, convertible multiple wavelengths, tunable wavelength, steady operation at room temperature and the like.

Description

technical field [0001] The invention relates to a multi-wavelength switchable and tunable fiber laser based on a tapered fiber, and belongs to the technical field of fiber lasers. Background technique [0002] Multi-wavelength fiber lasers are widely used in the fields of optical communication, optical measurement and optical sensing. However, in ordinary doped fiber lasers, due to the mode competition caused by the gain broadening effect, it is difficult to achieve stable multi-wavelength output at room temperature in one laser cavity. [0003] At present, there are many ways to realize the multi-wavelength output of fiber lasers. In the early days, the doped fiber was cooled in liquid nitrogen to eliminate the gain broadening effect, but this method cannot operate the laser at room temperature, which is greatly limited in practical applications; the four-wave mixing effect of the fiber is used to make the wavelength difference The automatic distribution of power between ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problems of complex structure of current multi-wavelength fiber lasers, inability to conveniently realize tunable wavelength conversion and high cost, and to provide a stable output of one or more wavelengths and combined output between different wavelengths. Multi-wavelength switchable and tunable fiber laser based on tapered fiber

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