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Random Bragg-gratings-based narrow linewidth random fiber laser with a pi-phase-shifted FBG

2019-10-08

Authors: Miao, SJ; Zhang, WT; Song, Y

CHINESE OPTICS LETTERS

Volume: 17 Issue: 9 Published: SEP 10 2019 Language: English Document type: Article

DOI: 10.3788/COL201917.090605

Abstract:

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.

Full Text: http://www.opticsjournal.net/Articles/abstract?aid=OJf4f0638d32abe5d6



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