A single-wavelength Brillouin fiber laser (BFL) is demonstrated at the extended L-band region using bismuth-based erbium-doped fiber (Bi-EDF) for the first time to the best of our knowledge. A -long Bi-EDF is used to provide both nonlinear and linear gains to generate a stimulated Brillouin scattering (SBS) and to amplify the generated SBS, respectively. The BFL operates at , which is upshifted by from the Brillouin pump with a peak power of and a side-mode suppression ratio of more than . The generated BFL has a narrow linewidth and many potential applications, such as in optical communication and sensors.
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