Abstract

A watt-level tunable 1.5 μm narrow linewidth fiber ring laser using a temperature tuning $\pi$-phase-shifted fiber Bragg grating ($\pi$-PSFBG) is demonstrated here, to the best of our knowledge, for the first time. The $\pi$-PSFBG is employed as both a narrow band filter and a wavelength tuning component, and its central wavelength is thermally tuned by a thermo-electric cooler. The maximum laser power is about 1.1 W with a linewidth of $\sim 318\mathrm{MHz}$ ($\sim 2.57\mathrm{pm}$) and a power fluctuation of less than 3%. The wavelength tuning range of the laser is about 1.29 nm with a sensitivity of $\sim 14.33\mathrm{pm}/°\mathrm{C}$, and the wavelength fluctuation is about 0.2 pm. This work provides important reference for tunable fiber lasers with both high power and narrow linewidth.

© 2017 Optical Society of America

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