Open AccessSelf-mixing interference measurement system of a fiber ring laser with ultra-narrow linewidth
Author(s) -
Liang Lü,
Jigang Yang,
Longhua Zhai,
Rui Wang,
Zhang Cao,
Benli Yu
Publication year - 2012
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.20.008598
Subject(s) - laser linewidth , optics , materials science , fiber bragg grating , fiber laser , interference (communication) , ring laser , laser , saturable absorption , signal (programming language) , optoelectronics , physics , telecommunications , channel (broadcasting) , computer science , programming language
A novel device for self-mixing interference measurement based on the fiber ring laser with ultra-narrow linewidth was investigated for the first time. In order to achieve requirement of our measurement system, a saturable-absorber which consists of a segment un-pumped erbium-doped fiber and a fiber Bragg grating is employed to provide a fine mode selection and guarantee the ultra-narrow linewidth operation. Results demonstrate that the signal-to-noise ratio of the self-mixing interference signal could be enhanced from 18.01 dB to 38.35 dB by inserting a saturable-absorber in the laser cavity. It is in good agreement with the theoretical analysis and proved potential using in self-mixing interference measurement system for high sensitivity and remote measurement.