title: Pulse-shaping of gain-switched pulse from multimode laser diode using fiber Sagnac interferometer.
abstract: We propose a pulse-tail elimination and pulse shortening method using an optical interferometer, which is effective for picosecond chirped pulses from gain-switched multimode laser diodes. In a numerical simulation, when the delay distance between a chirped pulse and its replica in an optical interferometer matches two times the round-trip optical length of the laser cavity, the pulse-front and -rear tail parts are effectively eliminated from the input chirped pulse after passing through the optical interferometer. Using this method with a fiber Sagnac interferometer, a 33 ps pulse with a long-tail emitted from a gain-switched 1540 nm multimode laser diode was linearly transformed into a 20 ps pulse with a substantially reduced tail.
authors.affiliation: Department of Physics & Electronics, Osaka Prefecture University,1-1, Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan. wada@pe.osakafu-u.ac.jp
authors.forename: Kenji
authors.initials: K
authors.lastname: Wada
authors.forename: Shuji
authors.initials: S
authors.lastname: Takamatsu
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Watanebe
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Matsuyama
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Horinaka