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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1991),
  • paper CMF1

Cascadable surface-emitting laser logic devices

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Abstract

Our cascadable optical switch is based on the integration of a heterojunction phototransistor (HPT) with a vertical-cavity surface-emitting laser (VCSEL) diode. We report high optical gain (>20 overall, >200 differential) and contrast (>2780, 34 dB). Our basic "unit cell," a surface-emitting laser logic (CELL) device, consists of a photodetector with electrical gain and a low-threshold VCSEL (Fig. 1). In the CELLs basic operation, incident light generates photocurrent in the detector element; this light is internally amplified and then used to drive the laser element above threshold. This optical-electrical-optical conversion results in inputs insensitive to optical feedback.

© 1991 Optical Society of America

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