Array type outer cavity adjustable laser adopting passive waveguide gratings

Abstract

The invention relates to an array type outer cavity adjustable laser adopting passive waveguide gratings. The array type outer cavity adjustable laser comprises a monomode optical waveguide grating array unit, a second light beam collimation lens, a micro electro mechanical system (MEMS) optical reflector, a first light beam collimation lens, a semiconductor optical amplifier, a laser output assembly and a monomode tail fiber in sequence, wherein the monomode optical waveguide grating array unit provides a plurality of narrow-band high-reflectivity ports with specific wavelengths; the rotatable MEMS optical reflector is used for selecting optical paths connecting between the semiconductor optical amplifier and the narrow-band high-reflectivity ports with the specific wavelengths and realizing the lasing of the laser output assembly under the specific wavelengths; the semiconductor optical amplifier is used for providing resonant cavity gain; the first light beam collimation lens and the second light beam collimation lens are used for realizing the transformation of light beams inside a cavity; and the laser output assembly is used for realizing the reverse isolation of output light and the extraction of output optical signals and outputting the output optical signals to the monomode tail fiber in a coupling way. The invention can realize narrower line widths, larger wavelength covering range, the cooperative control of cavity lengths and centre wavelengths and the selection of multiple resonance wavelengths.

Description

technical field [0001] The invention relates to a tunable laser. In particular, it relates to an array-type external-cavity tunable laser using a passive waveguide grating that can be used in a new generation of reconfigurable multi-wavelength optical communication network and coherent optical communication. Background technique [0002] Tunable narrow-linewidth lasers have been widely used in the field of optical communications. Especially in recent years, with the market's increasing demand for network flexibility and bandwidth, the development of optical communication networks has the following trends: In the network group In terms of network, the development of optical network with dynamic and reconfigurable functions has gradually become the mainstream; in terms of optical transmission, the rise of coherent optical communication has led to a new round of revolution in optical transmission technology. As an important enabling device, tunable narrow-linewidth lasers have...

AI Technical Summary

Problems solved by technology

However, in the external cavity tunable laser system based on the volume grating combined with the MEMS mirror, due to the resolution factor of the volume grating, it is limited in realizing a narrower linewidth laser; while the laser array and the MEMS mirror and the laser The technology of array and a group of fiber grating obviously adopts too many DFB lasers, the structure is complex and the cost is high. How to achieve wide-range adjustable and obtain single-channel narrow linewidth and low noise characteristics has always been an issue for experts in the industry. Topics of concern

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