Abstract
A stable and tunable single-longitudinal-mode (SLM) Brillouin/Erbium fiber laser (BEFL) with narrow linewidth is proposed and experimentally demonstrated. A uniform Bragg grating written in a segment of unpumped Erbium-doped fiber (EDF) is incorporated as an auto-tracking filter to achieve SLM operation. A length of 5m pumped EDF is used to provide both Brillouin and linear gain in the cavity. The linewidth is measured to be 18kHz and the lasing peak power fluctuation and wavelength shift are monitored less than 0.027dB and 2pm respectively.
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