InGaAsP/InP optoelectronic exclusive-OR (XOR) gate operating with optical inputs and outputs

An optoelectronic exclusive-OR (XOR) gate operating with optical inputs and outputs was fabricated. The gate is based on an optoelectronic bistable switch consisting of a light emitting diode (LED) and a heterojunction phototransistor (HPT). The inverter function indispensable for the XOR logic is attained optically by connecting an additional HPT to the bistable switch in parallel. Successful operation of the XOR logic was demonstrated.<
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