Open AccessSelective transverse mode operation of a fiber laser based on few-mode FBG for rotation sensing
Author(s) -
Xiao Liang,
Li Yang,
Geng Zhang,
Zhingming Liu
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.037964
Subject(s) - optics , materials science , rotation (mathematics) , single mode optical fiber , core (optical fiber) , mode coupling , transverse mode , equilibrium mode distribution , coupling (piping) , laser , resonance (particle physics) , fiber laser , radiation mode , physics , geometry , mathematics , metallurgy , particle physics
A fiber laser with selective transverse mode operation based on few-mode FBG was designed, and rotation sensing via hybrid mode operation was successfully demonstrated. The mode selection was achieved by a few-mode FBG inscribed in homemade elliptical multilayer-core fiber (EMCF). The particular designed EMCF only supports LP 01 and LP 11 even mode groups, and the resonance of a few-mode FBG could be adjusted through mode excitation. Therefore, selective transverse mode operation was realized by switching the resonance wavelengths corresponding to the self-coupling mode or cross-coupling mode. Besides, rotation sensing was achieved in the hybrid mode operation due to the asymmetric multilayer-core design. A sensitivity of 0.074 mW/° was preliminarily demonstrated. The measured angle of the rotation sensing system is within ± 2° in the temperature range of 10-90 °C, showing that this system was inherently insensitive to temperature, eliminating the requirement for temperature compensation.