title: Self-mixing interference measurement system of a fiber ring laser with ultra-narrow linewidth.
abstract: 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.
authors.affiliation: Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of Education, Anhui University, Hefei, Anhui 230601, China. Lianglu@ahu.edu.cn
authors.forename: Liang
authors.initials: L
authors.lastname: Lu
authors.forename: Jingyu
authors.initials: J
authors.lastname: Yang
authors.forename: Longhua
authors.initials: L
authors.lastname: Zhai
authors.forename: Rui
authors.initials: R
authors.lastname: Wang
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Cao
authors.forename: Benli
authors.initials: B
authors.lastname: Yu