Open AccessMulti-longitudinal mode fiber laser sensor system with high signal-to-noise ratio based on laser modes control
Author(s) -
Yu Guo,
Shangjing Liu,
Yi Ni,
Haodong Wu,
Xiang Fei Chen
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.27.011776
Subject(s) - fiber bragg grating , optics , fiber laser , materials science , laser , longitudinal mode , signal to noise ratio (imaging) , fiber optic sensor , polarization maintaining optical fiber , distributed feedback laser , optical fiber , physics
A multi-longitudinal mode fiber laser sensor (MLMFLS) system with high signal-to-noise ratio (SNR) is proposed. To the best of authors' knowledge, this is the highest SNR ever reported by MLMFLS system. The laser sensor consists of a narrow-band fiber Bragg grating (FBG), erbium-doped fiber (EDF) and an optical reflector. The FBG controls the number of laser modes which excited by laser sensor. Beat frequency signals (BFS) modulated by applied measurand are generated by those laser modes and their SNR are controlled by the FBG. Measurement results show the BFS have SNR of 65.0 dB, accuracy of ± 2.0 με, and stability of 0.4 kHz, which demonstrate its high SNR, accuracy and stability.