Pulse-shaping of gain-switched pulse from multimode laser diode using fiber Sagnac interferometer.
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.
Wada
Kenji
K
Department of Physics & Electronics, Osaka Prefecture University,1-1, Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan. wada@pe.osakafu-u.ac.jp
Takamatsu
Shuji
S
Watanebe
Hideyuki
H
Matsuyama
Tetsuya
T
Horinaka
Hiromichi
H