Abstract
A novel switchable multi-wavelength erbium-doped fiber laser based on random distributed feedback is demonstrated in this paper. Based on loop mirror to form a half-opened laser cavity, typical random laser radiation is achieved with an obvious threshold behavior as a function of pump power. Switchable multi-wavelength lasing operation is also achieved by changing attenuation value through the variable optical attenuator. Due to the efficient gain from the pumped erbium-doped fiber, a low threshold power of 22 mW is achieved, which is much lower in magnitude than that of previously reported conventional random fiber lasers.
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