Open AccessPulse-shaping of gain-switched pulse from multimode laser diode using fiber Sagnac interferometer
Author(s) -
Kenji Wada,
Shuji Takamatsu,
Hideyuki Watanebe,
Tomohiro Matsuyama,
Hiromichi Horinaka
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.019872
Subject(s) - optics , interferometry , femtosecond pulse shaping , multi mode optical fiber , laser , pulse (music) , materials science , laser diode , ultrashort pulse , bandwidth limited pulse , optical fiber , physics , detector
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.