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OPTICAL FLIP-FLOP AND LOGIC GATE OPERATIONS WITH ZnSe NONLINEAR ETALONS USING TWO LIGHT BEAMS

Takashi Kurokawa, Hiroyuki Tsuda, S. Fukushima

Published Jul 18, 1988• 0 citations
OpenAlex

Abstract

There has recently been increasing interest in bistable optical devices because of their potential for all-optical signal processing in optical computing systems and optical transmission networks(1), (2). Nonlinear Fabry-Perot etalons whose steady-state properties have been studied extensively are one candidate for such applications. Relatively little work, however, has been done on their operating characteristics and transient behavior(3).

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Integrated and Guided-Wave Optics•Jan 1, 1980•1 citation
There has recently been increasing interest in bistable optical devices because of their potential for all-optical signal processing in optical computing systems and optical transmission networks(1), (2). Nonlinear Fabry-Perot etalons whose steady-state properties have been studied extensively are one candidate for such applications. Relatively little work, however, has been done on their operating characteristics and transient behavior(3).
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.
In this paper we present the basic principles of optical bistability and summarize the current advances in semiconductor optical switching, with emphasis on recent results in GaAs, CuCI, InAs, InSb, CdS, ZnS, and ZnSe etalons. These devices have great potential for applications involving optical signal processing and computing. As an example, we discuss the use of arrays of bistable devices for parallel optical processing and for addressable spatial light modulators. The use of nonlinear etalons as optical gates is also illustrated. To date, GaAs devices have shown the most favorable characteristics for practical applications. They operate at room temperature with a few milliwatts of power using a laser diode as the only light source. Quasi-cw operation and optical fiber signal regeneration have also been demonstrated. A GaAs NOR gate operates in 1 ps with <3 pJ incident energy; this, of course, implies a 1 ps switch-on time for a bistable etalon.
Optical signal processing using all-optical circuitry is an increasingly attractive goal with the recent progress in long- lived light sources, high quantum efficiency detectors, and low- loss high-bandwidth optical fibers. Devices which permit one light beam to control another or which provide an optical memory afford a capability essential to the success of all-optical logic systems. Much progress has been made toward practical bistable1 devices since the first observation2 of optical bistability in sodium vapor. (By optical bistability we refer to devices containing no inverted medium, so that bistable lasers3 are explicitly excluded.) The most practical device so far, a semiconductor etalon consisting of 4 μm of GaAs between 0.2 μm of Al0.42Ga0.53As with R = 0.9 coatings, is described herein.