Chinese Optics Letters, 2019, 17 (9): 090605, Published Online: Aug. 19, 2019
Random Bragg-gratings-based narrow linewidth random fiber laser with a -phase-shifted FBG Download: 768次
Abstract
A new structure of short-cavity random fiber laser (RFL) with narrow linewidth lasing is proposed. A -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.
Shuaijie Miao, Wentao Zhang, Ying Song. Random Bragg-gratings-based narrow linewidth random fiber laser with a