title: Dynamics of short-pulse generation via spectral filtering from intensely excited gain-switched 1.55-μm distributed-feedback laser diodes.
abstract: Picosecond-pulse-generation dynamics and pulse-width limiting factors via spectral filtering from intensely pulse-excited gain-switched 1.55-μm distributed-feedback laser diodes were studied. The spectral and temporal characteristics of the spectrally filtered pulses indicated that the short-wavelength component stems from the initial part of the gain-switched main pulse and has a nearly linear down-chirp of 5.2 ps/nm, whereas long-wavelength components include chirped pulse-lasing components and steady-state-lasing components. Rate-equation calculations with a model of linear change in refractive index with carrier density explained the major features of the experimental results. The analysis of the expected pulse widths with optimum spectral widths was also consistent with the experimental data.
authors.affiliation: Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan. shaoqiangchen@gmail.com
authors.forename: Shaoqiang
authors.initials: S
authors.lastname: Chen
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yoshita
authors.forename: Aya
authors.initials: A
authors.lastname: Sato
authors.forename: Takashi
authors.initials: T
authors.lastname: Ito
authors.forename: Hidefumi
authors.initials: H
authors.lastname: Akiyama
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yokoyama
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005246:Feedback; D005374:Filtration / Q000295:instrumentation*; D053844:Lasers, Solid-State; D008027:Light