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Proceedings Paper

Acousto-optic compressing photodetector approach for cw signals
Author(s): Francis J. Kub; Gordon Wood Anderson
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Paper Abstract

Two types of acoustooptic compressing photodetector structures suitable for continuous wave or long pulsewidth signals are described. The first compressing photodetector structure utilizes the subthreshold operation of carrier transport over the blooming gate to generate a compressing transfer characteristic. The second compressing structure utilizes the Coulombic repulsion of carriers at high carrier densities to generate a compressing transfer characteristics. The first structure is optimum for long integration times (10 to 200 microns), while the second structure is appropriate for short integration times (1 to 20 microns). Both detector structures initially exhibit an integration characteristic followed by a compresing characteristic. In both cases, the onset of the compressing characteristic is adjustable by varying the offset bias between the blooming gate and the imaging gate. The first detector structure exhibits a logarithmic compressing characteristic while the second detector structure exhibits a square-root compressing characteristic. Simulation models have been developed for both detector structures.

Paper Details

Date Published: 1 October 1990
PDF: 9 pages
Proc. SPIE 1291, Optical and Digital Gallium Arsenide Technologies for Signal Processing Applications, (1 October 1990); doi: 10.1117/12.21019
Show Author Affiliations
Francis J. Kub, Naval Research Lab. (United States)
Gordon Wood Anderson, Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 1291:
Optical and Digital Gallium Arsenide Technologies for Signal Processing Applications
Mark P. Bendett; Daniel H. Butler; Arati Prabhakar; Andrew C. Yang, Editor(s)

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