title: Passive mode locking at harmonics of the free spectral range of the intracavity filter in a fiber ring laser.
abstract: We report the passive mode-locking at harmonics of the free spectral range (FSR) of the intracavity multi-channel filter in a fiber ring laser. The laser uses a sampled fiber Bragg grating (SFBG) with a free spectral range (FSR) of 0.8 nm, or 99 GHz at 1555 nm, and a length of highly nonlinear photonic crystal fiber with low and flat dispersion. Stable picosecond soliton pulse trains with twofold to sevenfold enhancement in the repetition rate, relative to the FSR of the SFBG, have been achieved. The passive mode-locking mechanism that is at play in this laser relies on a dissipative four-wave mixing process and switching of repetition rate is realized simply by adjustment of the intracavity polarization controllers.
authors.affiliation: Lightwave Department, Institute for Infocomm Research, 637723, Singapore, China. zhangsm_sd@eyou.com
authors.forename: Shumin
authors.initials: S
authors.lastname: Zhang
authors.forename: Fuyun
authors.initials: F
authors.lastname: Lu
authors.forename: Xinyong
authors.initials: X
authors.lastname: Dong
authors.forename: Ping
authors.initials: P
authors.lastname: Shum
authors.forename: Xiufeng
authors.initials: X
authors.lastname: Yang
authors.forename: Xiaoqun
authors.initials: X
authors.lastname: Zhou
authors.forename: Yandong
authors.initials: Y
authors.lastname: Gong
authors.forename: Chao
authors.initials: C
authors.lastname: Lu