Passively mode-locked all-fiber bismuth laser with dispersion compensation by a chirped fiber Bragg grating

Bismuth (Bi)-ion doped silica fiber is a new type of active fiber having a gain spectrum at 1100-1400 nm. Recently, we have demonstrated a mode-locked Bi-doped fiber laser operating in the soliton regime using a grating pair dispersion compensator. In this work, we demonstrate the first mode-locked Bi-doped all-fiber laser with dispersion compensation provided by a linearly chirped fiber Bragg grating (CFBG). The laser, with a compact and low-loss all-fiber cavity, delivers -2 ps pulses at a wavelength of-1.17 mum. The repetition rate of the pulses can be tuned from -6.3 MHz to -100.6 MHz by operating the laser at different harmonics of the fundamental frequency of the laser cavity.