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Japanese Journal of Applied Physics

Undershooting, Flip-Flop and Set-Reset Operations in Electrooptic Bistable Devices

Masakatsu Okada, Kuniharu Takizawa, Tahito Aida, Hiroshi Kikuchi

Published May 1, 1989• 1 citation
Publisher

Abstract

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.

DOI
10.1143/jjap.28.l834

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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.
The effect of undershoot switching, downward switching from the upper to the lower state by undershooting caused by the rapid diminishing of the applied optical pulse, is analyzed for bistable laser diodes with inhomogeneous current injection. The height and width of the optical input pulse superposed on the optical bias are shown to play an important role in undershoot switching as well as the level of the optical bias. It is also shown that set-reset and the generation of the optical monostable pulse can be done by using undershoot switching.>
We demonstrate an integrated symmetric self-electrooptic effect device (S-SEED) consisting of two quantum well PIN diodes electrically connected in a series. The device acts as a bistable optical memory element with individual set S and reset R inputs and complementary outputs (optical S-R latch). The switching point is determined by the ratio of the two inputs, making the device insensitive to optical power supply fluctuations when both power beams are derived from the same source; i.e., it solves the problem of critical biasing common to most optically bistable devices.
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.