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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 17,
  • Issue 9,
  • pp. 090605-
  • (2019)

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

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Abstract

A new structure of short-cavity random fiber laser (RFL) with narrow linewidth lasing is proposed. A π-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.

© 2019 Chinese Laser Press

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