Random Bragg-gratings-based narrow linewidth random fiber laser with a π-phase-shifted FBG |
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引用本文: | 苗帅杰,张文涛,宋颖.Random Bragg-gratings-based narrow linewidth random fiber laser with a π-phase-shifted FBG[J].Chinese Optics Letters,2019(9). |
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作者姓名: | 苗帅杰 张文涛 宋颖 |
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摘 要: | A new structure of short-cavity random fiber laser(RFL) with narrow linewidth lasing is proposed. Aπ-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 with58 d B side-mode-suppression ratio. The laser threshold was 4.5 mW, and the optical signal-to-noise ratio was up to 63 dB.
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