Generation of Stable Picosecond Chirp-Free Pulses at 10 GHz from a Nonpolarization Maintaining Regeneratively Mode-Locked Fibre Laser

A 10 GHz regeneratively mode-locked fibre laser (RMLFL) at 1550 nm constructed with commercially available radio frequency components is presented. Chirp-free hyperbolic secant pulses with duration from 4.4 ps to 8 ps and output reaching 3.6 mW are acquired. Without any cavity length or polarization maintaining mechanism, the error-free operation of this RMLFL can be carried out in room temperature.