Random Bragg-gratings-based narrow linewidth random fiber laser with a pi-phase-shifted FBG
Authors: Miao, SJ; Zhang, WT; Song, Y
CHINESE OPTICS LETTERS
Volume: 17 Issue: 9 Published: SEP 10 2019 Language: English Document type: Article
A new structure of short-cavity random fiber laser (RFL) with narrow linewidth lasing is proposed. A pi-phase-shifted fiber Bragg grating (FBG) loop mirror was used in the RFL for spectral filtering and to suppress multi-mode oscillation due to the narrow transmission window. The random feedback of the RFL was implemented by a randomly dispersed weak reflection FBG array. The high gain of the erbium-doped fiber and a half-open cavity design results in a low lasing threshold. The linewidth of the laser was 225 Hz with 58 dB side-mode-suppression ratio. The laser threshold was 4.5 mW, and the optical signal-to-noise ratio was up to 63 dB.