Opt Express. 2008 Nov 24;16(24):19872-81. doi: 10.1364/oe.16.019872.

Pulse-shaping of gain-switched pulse from multimode laser diode using fiber Sagnac interferometer.

Optics express

Kenji Wada, Shuji Takamatsu, Hideyuki Watanebe, Tetsuya Matsuyama, Hiromichi Horinaka

PMID: 19030074 DOI: 10.1364/oe.16.019872

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.

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