A multi-wavelength fiber laser based on two-dimensional active π-phase-shifted fiber grating

Abstract

The invention discloses a multi-wavelength fiber laser based on a two-dimensional active π-phase-shifted fiber grating, which includes a pump source, a wavelength division multiplexer, and a resonant cavity connected in series, and the resonant cavity is composed of a two-dimensional active π-phase The two-dimensional active π-phase shifting fiber grating comprises a fiber core, and the fiber core includes more than two sub-active π-phase-shifting fiber gratings, and each sub-active π-phase-shifting fiber grating is connected to the center of the fiber core. The axes are parallel, and each sub-active π phase-shifting fiber grating does not overlap and is not collinear. The invention has the advantages of compact structure, small volume and low cost.

Description

technical field [0001] The invention relates to the field of fiber lasers, in particular to a multi-wavelength fiber laser based on a two-dimensional active π phase-shifting fiber grating. Background technique [0002] In the field of optical fiber communication and optical fiber sensing, wavelength division multiplexing is one of the most common multiplexing methods in the system. This multiplexing method requires the system light source to have multiple laser wavelength outputs. Usually, the most straightforward way to obtain multi-wavelength laser output is to simply combine several single-wavelength lasers with different wavelengths. However, as the system communication capacity increases and the network scale becomes larger, simply increasing the number of single-wavelength lasers will lead to a series of problems such as increased system cost, increased power consumption, and increased complexity. Therefore, the development of compact multi-wavelength lasers with simp...

AI Technical Summary

Problems solved by technology

Due to the long ring cavity, the distance between the longitudinal modes of the laser is very small, and the phenomenon of multi-longitudinal mode oscillation output and mode hopping often occurs, which seriously affects the performance of the laser.

In order to suppress mode hopping, ring cavity fiber lasers usually have a complex structure and high cost

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