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The pnpn optical switch is an optoelectronic device that emits light in response to an optical input while an electrical bias is applied. A clocked bias insures synchronization. Other modes of operation are possible. pnpn structures have been fabricated by different techniques. Turn -on and turn -off times of less than 10 nsec have been obtained. High optical gain is possible. Some logic functions can be accomplished within this threshold device.

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