Optical switch by direct modulated laser diode using fiber laser for pulse picking

Abstract

A new method of direct modulating a pre-amplifier laser diode as an optical switch is proposed. To modulate the laser diode with lower repetition rate, the repetition rate in the kilohertz region can be achieved using a source laser of 100 MHz without electro-optical modulators (EOM) or acousto-optical modulators (AOM). Using a direct modulated laser diode, an ON/OFF ratio (extinction ratio) of 25 dB was demonstrated in this study.