基于激光模式控制的高信噪比多纵模光纤激光传感器系统

Multi-longitudinal mode fiber laser sensor system with high signal-to-noise ratio based on laser modes control.

作者信息

Guo Yu, Liu Shangjing, Ni Yi, Wu Haodong, Chen Xiang Fei

出版信息

Opt Express. 2019 Apr 15;27(8):11776-11782. doi: 10.1364/OE.27.011776.

DOI:10.1364/OE.27.011776

Abstract

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.

摘要

提出了一种具有高信噪比（SNR）的多纵模光纤激光传感器（MLMFLS）系统。据作者所知，这是MLMFLS系统迄今报道的最高信噪比。该激光传感器由窄带光纤布拉格光栅（FBG）、掺铒光纤（EDF）和一个光学反射器组成。FBG控制由激光传感器激发的激光模式数量。由施加的被测量调制的拍频信号（BFS）由这些激光模式产生，并且它们的信噪比由FBG控制。测量结果表明，BFS的信噪比为65.0 dB，精度为±2.0 με，稳定性为0.4 kHz，这证明了其高信噪比、精度和稳定性。