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Electronics Letters

All-optical flip-flop operations in a coupled element bistable device

Kenju Otsuka

Published Jun 23, 1988• 20 citations
Publisher

Abstract

An optical bistable device composed of coupled nonlinear elements is proposed. This device features optical bistability without hysteresis. It is shown theoretically that a set-reset type (S-R) flip-flop operation can be easily achieved on an all-optical basis by utilising nonhysteretic bistable characteristics.
DOI
10.1049/el:19880544

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We show that the reset operation, switching from an upper stable state to a lower one in optical bistable devices, is achieved by means of a positive optical pulse through undershoot-switching, in contrast with conventional downward switching by means of optical pulses negative relative to an optical bias level. Flip-flop and set-reset operations are demonstrated by using only positive optical pulses in an electrooptic bistable device, in which similar operations can also be achieved by applying electric pulses on a biased optical input.
We have proposed a scheme for all-optical switching and flip-flop based on controllable optical bistability in a simple three-level V-type atomic system assisted by an incoherent pump field. Due to the auxiliary incoherent pump, the atomic population is redistributed in the three levels, and then the absorption-dispersion property and the Kerr nonlinearity of the medium are different from those of the conventional V-type electromagnetically induced transparency system. The results show that both the thresholds and the area (or shape) of the hysteresis loop can be controlled efficiently via the adjustment of either the incoherent pump field or the coupling field. As a result, with a constant cavity input, the output of the optical cavity can be switched between the low- and high-power states of different bistable curves by tuning the optical fields. Based on this effect, we realize all-optical steady-state switching and set-reset flip-flop operation by adding a pulse sequence (positive pulse or set-reset pulse) onto either the incoherent pump field or the coupling field. Such a simple and effective technique of optical switching and flip-flop can find application in all-optical signal processing systems.