Abstract

We propose a reliable method for stabilizing narrow linewidth Brillouin fiber lasers with non-resonant pumping. Mode-hopping is suppressed by means of a phase-locked loop that locks the pump–Stokes detuning to a local radio-frequency (RF) oscillator. Stable single-mode operation of a 110-m-long Brillouin fiber laser oscillating at 1.55 μm is demonstrated for several hours. The beat note between two independent Stokes waves presents a phase noise level of 60dBc/Hz at 100 Hz with a 20dB/decade slope, and a FWHM linewidth lower than 50 Hz.

© 2016 Optical Society of America

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Supplementary Material (1)

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» Visualization 1: MP4 (7738 KB)      The efficiency of the locking operation is illustrated in the additional video showing the time evolution of the beat note frequency during successive sequences of free running and locking regimes.

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