C- and L-band tunable random distributed feedback fiber laser

We presented a random distributed feedback (RDFB) fiber laser with widely tunable range that covers both C- and L-band. It is formed by a half-open cavity with forward pumping scheme. The hybrid gain from erbium-doped fiber (EDF) and single-mode fiber (SMF) enables the fiber laser to oscillate with not only a broadband tunability, but also a low laser threshold. The proposed fiber laser can be tuned continuously from 1524.9 to 1602.7 nm with a wavelength range of 72.8 nm and a laser threshold of 19.6 mW.