ACTIVE OPTICAL NOR LOGIC DEVICES USING SURFACE-EMITTING LASERS

Abstract

Cascadable active laser logic devices are described, demonstrating NOR and INVERTER functions with negative optical gain of 5. The surface-emitting laser logic device consists of an AlGaAs superlattice surface-emitting laser discretely connected to an AlGaAs heterojunction phototransistor in parallel. The optical logic output of 0.5 mW is controlled off with 100-mu-W incident (44-mu-W absorbed) on the heterojunction phototransistor part of the device.