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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.
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Kaneko et al. (2023) studied this question.
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