External-cavity type narrow-linewidth V-groove fiber bragg grating laser

Abstract

The invention discloses an external-cavity type narrow-linewidth V-groove fiber bragg grating laser. The laser comprises a gain medium. A highly reflective mirror is plated on one end of the gain medium. An anti-reflective coating I is plated on the other end of the gain medium. A fiber bragg grating carrier, opposite to the anti-reflective coating I, is arranged outside the gain medium. V-type grooves are arranged in the upper end face of the fiber bragg grating carrier. One end of a fiber bragg grating is fixed in the V-type grooves and the other end of the fiber bragg grating stretches out of the fiber bragg grating carrier. An anti-reflective coating II is arranged on one end, corresponding to the gain medium, of the fiber bragg grating carrier, and corresponds to the anti-reflective coating I. The laser is advantageous in that (1) by arranging the V grooves, the coupling loss of the fiber bragg grating and the gain medium is low; (2) after the V grooves are provide, the impact resistance of the fiber bragg grating is good and the noise is low; (3) the fiber bragg grating is used as a reflection structure and wavelength choice, so noise is low and linewidth is narrow; and (4) the fiber bragg grating is used as one part of a resonant cavity, a fiber can be coupled to the laser without a lens, so the structure is simple and the loss is low.

Description

technical field [0001] The invention belongs to the technical field of lasers, in particular to an external cavity type narrow line width V-groove fiber grating laser. Background technique [0002] Lasers will have broad application prospects in the fields of communication, military, medical and optical information processing, especially in the field of optical communications. With the development of optical wavelength division multiplexing technology, fiber lasers will be able to meet the needs of communication systems for light sources. Higher requirements. At present, lasers for communication are mainly semiconductor lasers, and the existing problems are: semiconductor lasers have poor monochromaticity and wide linewidth, so narrow linewidth lasers using Bragg gratings have emerged as the times require. Since the narrow linewidth laser of the waveguide Bragg grating has a large coupling loss, the manufacturing cost of the m=0-level Bragg grating is high and difficult to ...

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Problems solved by technology

[0003] The invention aims to solve technical problems such as low coupling efficiency of waveguide external cavity grating laser, high manufacturing cost, poor vibration resistance and easy noise generation of fiber type grating laser, thereby providing a low coupling loss, good anti-shock performance, low noise, Low-cost external-cavity narrow-linewidth V-groove fiber grating laser

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