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Applied Optics

Highly cascadable optically bistable device for large fan-out optical computing uses

Nicholas C. Craft

Published May 1, 1988• 5 citations
Publisher

Abstract

Limited cascadability and fan-out are among the problems associated with the use of optically bistable Fabry-Perot -talons as optical logic elements. A novel etalon-based device is described which is shown to have a much increased cascadability, and therefore fan-out capability, over conventional optical logic elements.
DOI
10.1364/ao.27.001764

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Smith et al have shown (1) that in order to ensure that the change in output from one bistable device is sufficient to switch the succeeding one, the technique know as ’hold and switch’ is desirable. This involves holding a device as close as possible to its switch point with one laser beam, and using the change in output from a previous similar device to induce switching, thus providing fully restoring logic. Due to the fact that the holding power cannot be made arbitrarily close to the switching power, and that a substantial "over switch" is required to avoid the effects of critical slowing down, there exists a fundamental limit upon the cascadability and fan out potential of conventional bistable devices. This is because their change in output power can only be less than or equal to their switching power. A better device would be one in which the change in output power could be significantly larger than the switching power. The twin cavity device (TCD) described here will be shown to possess this quality.
This article describes the application of one type of optical bistable device based on gallium arsenide as the nonlinear medium. The authors discuss several possible operations with GaAs nonlinear Fabry-Perot etalons. This article utilizes a recently developed computer model to illustrate the basic operating principles and applications. The authors mainly concentrate on the device operation itself. In keeping with common practice they use the term optical bistable device when referring to a device that can exhibit optical bistability even when not being used in such a manner. Instead of the expression nonlinear Fabry-Perot etalon, they often use nonlinear etalons or etalon devices.