Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1989-08-28
1990-10-30
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250211J, 377102, H01J 4014
Patent
active
049670689
ABSTRACT:
Apparatus having a plurality of photodetectors interconnected to form an electrical circuit corresponding to any given logic function comprising at least two of the four basic AND, OR, NAND, and NOR logic operations. The apparatus performs optical logic without optical cascading since the electrical circuit controls the generation of an optical output beam based on the value that the given logic function assumes in response to a plurality of optical signal beams each incident on at least one of the photodetectors. A complementary optical output is obtained and time-sequential operation is effected when two, serially connected quantum well p-i-n diodes comprising an S-SEED are used to generate optical output beams in response to the voltage developed by the electrical circuit of interconnected photodetectors.
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"Photonic Ring Counter and Differential Logic Gate Using the Symmetric Self-Electrooptic Effect Device", A. L. Lentine, et al., CLEO '88/Tuesday Morning/52, Apr. 26.
Lentine Anthony L.
Miller David A. B.
AT&T Bell Laboratories
Watland Ross T.
Westin Edward P.
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