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Optics Letters

All-optical flip-flop operation in an optical bistable device using two lights of different frequencies

Kyo Inoue

Published Nov 1, 1987• 27 citations
Publisher

Abstract

All-optical flip-flop operation in a Fabry-Perot-type optical bistable device (OBD) is investigated. The OBD is switched both from OFF to ON and ON to OFF using two lights of different frequencies as trigger pulses. We present the theoretical calculation, obtained by applying a conventional expression for a dispersive OBD to the two-light input case, and the experimental observation, in which a semiconductor laser amplifier is used as a bistable device.

DOI
10.1364/ol.12.000918

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All-optical flip-flop operation in a Fabry-Perot-type optical bistable device (OBD) is investigated. The OBD is switched both from OFF to ON and ON to OFF using two lights of different frequencies as trigger pulses. We present the theoretical calculation, obtained by applying a conventional expression for a dispersive OBD to the two-light input case, and the experimental observation, in which a semiconductor laser amplifier is used as a bistable device.
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Optical bistability has the potential to emulate the capabilities of electrical flip-flops, offering plenty of applications in optical signal processing. Conventional optical bistable devices operate by altering the susceptibility of a nonlinear medium. This method, however, often results in drawbacks such as large device size, high energy consumption, or long switching times. This work proposes an optical bistable device incorporating strong optical feedback into a Fano laser. This leads to multiple stable states and introduces a region of bistability between the inherent Fano mode and a feedback-induced Fabry-Perot mode. Unlike conventional bistable devices, the Fano system exploits strong field localization in a nanocavity to control the properties of one of the laser mirrors. This configuration means that switching states can be achieved by modulating the mirror's loss rather than changing the susceptibility of the active medium. Importantly, modulation can be implemented locally on a nanocavity, bypassing the need to adjust the entire laser system. This leads to fast flip-flop actions with low energy consumption. The feedback Fano laser can be embodied in a compact microscopic structure, thus providing a promising approach towards integrated all-optical computation and on-chip signal processing.