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A random fiber laser is demonstrated based on a 25-mm-long multiphase-shifted fiber Bragg grating fabricated in a highly Er/Yb-codoped fiber with the beam-scanning method. By inserting 20 phase errors with random amplitudes along the grating length and pumping it with a 980-nm laser diode, we achieved random laser output with high-optical signal-to-noise ratio up to 65 dB. The laser can be operated...
A tunable erbium-doped fiber (EDF) laser based on random distributed feedback through backward Rayleigh scattering in a 20-km-long single-mode fiber and a tunable fiber Fabry–Perot interferometer filter is demonstrated. It has a broad wavelength tuning range up to 40 nm (from 1525 to 1565 nm) with a narrow linewidth of $\sim$0.04 nm. Due to the half-opened laser cavity design and the efficient gain...
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