A couple of simple-structure phase modulators were used in active mode-locked fiber laser to implement repetition rate continuous tuning. The laser produces pulse as short as 5.7 ps whose repetition rate tuning can cover the spacing of the adjoining order mode-locking frequencies.
© 2006 Chinese Optics Letters
Fang Wan and Ziyu Wang, "Repetition rate continuously tunable 10-GHz picosecond mode-locked fiber ring laser," Chin. Opt. Lett. 4, 339-341 (2006)