Tunable random fiber laser based on two gratings

Abstract

The invention provides a tunable random fiber laser based on two gratings. The tunable random fiber laser comprises a laser source, a 1*2 optical fiber coupler, a first random optical pulse generator, a first electro-optical modulator, a first optical isolator, a first erbium-doped optical fiber amplifier, a single side band modulator, a microwave source, a first polarization controller, a second optical isolator, a second random optical pulse generator, a second electro-optical modulator, a third optical isolator, a delay optical fiber, a second erbium-doped fiber amplifier, a second polarization controller, a polarization beam combiner, a fourth optical isolator, an erbium-doped fiber, a polarization maintaining fiber, a random Brillouin dynamic grating, a pumping laser source, a wavelength division multiplexer, a high-reflection fiber bragg grating and a tuning device. According to the invention, the problem that random laser lasing can only be realized by means of a long-distance grating in the prior art is solved, and the laser capable of outputting tunable random laser without a high-power pumping source is provided.

Description

technical field [0001] The invention relates to the technical field of random fiber lasers, in particular to a tunable random fiber laser based on two gratings. Background technique [0002] Random fiber laser is a new type of laser developed in recent years. Compared with conventional fiber lasers, thanks to its advantages of no resonance mode, better stability, higher reliability, and simpler structure, it has been widely used in recent years. The exploration of multiple types of new light sources, such as high power, high efficiency, broad-spectrum emission, and low coherence, has made great progress, and a series of research results have been produced. At present, random fiber lasers mainly include three types: random fiber lasers based on Rayleigh scattering, random fiber lasers based on Raman effect, and random fiber lasers based on randomly distributed grating arrays. The random fiber laser based on Rayleigh scattering has the problem of long-distance fiber and high ...

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Problems solved by technology

[0004] Aiming at the defects or improvement needs of the prior art, the present invention proposes a tunable random fiber laser based on two kinds of gratings, which solves the problem of long-distance optical fiber and high lasing threshold for random laser output, and at the same time does not require a high-power pump source to achieve output Random laser tunable

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