title: Stimulated Brillouin scattering in dispersion-decreasing fiber with ultrahigh-speed femtosecond soliton pulse compression.
abstract: We report that stimulated Brillouin scattering (SBS) in a dispersion-decreasing fiber (DDF) is particularly disadvantageous with ultrahigh-speed femtosecond soliton compression that exceeds 40 GHz. It is important to note that the increase in the longitudinal mode power of a soliton is proportional to the square of the repetition rate. The SBS threshold is determined by the dispersion-decreasing rate of the DDF, rather than its fiber loss. We suppressed the SBS by applying 30-MHz frequency modulation to a mode-locked fiber laser and successfully obtained a stable 40-GHz, 100-fs pulse train.
authors.affiliation: Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan. hirooka@riec.tohoku.ac.jp
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Hirooka
authors.forename: Shinpei
authors.initials: S
authors.lastname: Ono
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Hagiuda
authors.forename: Masataka
authors.initials: M
authors.lastname: Nakazawa