Smart pixels using the light amplifying optical switch (LAOS)

A light amplifying optical switch (LAOS), a vertically integrated heterojunction phototransistor (HPT) and light emitting diode (LED) that has latching thyristor type current-voltage characteristics, is described. Since the HPT is designed to have high optical gain, it can be incorporated in a circu...

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Published in:IEEE journal of quantum electronics 1993-02, Vol.29 (2), p.769-774
Main Authors: Wilmsen, C.W., Beyette, F.R., An, X., Feld, S.A., Geib, K.M.
Format: Article
Language:English
Subjects:
Current-voltage characteristics
Heterojunctions
Light emitting diodes
Logic devices
Logic gates
Optical switches
Phototransistors
Smart pixels
Stimulated emission
Thyristors
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cited_by cdi_FETCH-LOGICAL-c337t-f41defb8b8f4d7c46440c5452dbcf4fec89c9d95446018d40c3906db2a0fda703
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description A light amplifying optical switch (LAOS), a vertically integrated heterojunction phototransistor (HPT) and light emitting diode (LED) that has latching thyristor type current-voltage characteristics, is described. Since the HPT is designed to have high optical gain, it can be incorporated in a circuit with the LAOS to fabricate high-performance optical logic gates such as a NOR, NAND, AND, or a gated latch. The methods for implementing these gates, experimental results for large mesa devices, and the performance of the gates are discussed. Logic gates that use either one or two wavelengths of input light are demonstrated. The present logic gates are shown to have output contrast ratios from 4 to 30, and operate at frequencies up to 300 kHz. Increasing this performance by improving processing techniques and reducing mesa size is discussed.< >
doi_str_mv 10.1109/3.199328
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subjects Current-voltage characteristics
Heterojunctions
Light emitting diodes
Logic devices
Logic gates
Optical switches
Phototransistors
Smart pixels
Stimulated emission
Thyristors
title Smart pixels using the light amplifying optical switch (LAOS)
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