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Tri-State Optical Switch for Local Area Fiber Optics Network

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Abstract

In fiber optics communications systems, emission and detection are usually handled by separate devices. Additionally, lenses, mirrors, couplers and amplifiers are used to focus the beam and amplify the corresponding signal. Devices such as this novel structure, which will reduce the number of components required and produce an inherently less expensive and more reliable system, incorporate emission and detection into a monolithic structure. The tri-state optical switch is a heterojunction phototransistor which can be used as an emitter-detector as well as a passive transmitter. By varying the voltage bias, this device will switch between all three modes of operation. Such a device has broad application in network environments with operation speeds of less than 50 MHz and distances of less than 1km, e.g. automobiles, airplanes and intra-instrumentation. This display will show the recent studies of emission mode operation of this device and the resulting mathematical model.

© 1994 Optical Society of America

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