Optical logic operation system

Details Optical logic operation system Optical logic operation system

1989-11-14

1991-09-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

377102, H01J 3150

Patent

active

050515730

ABSTRACT:
A plurality of ultra-high speed light receiving elements are provided each of which has two rectifier junctions being connected to each other opposite in polarity and has a substantially symmetrical electrode arrangement. A bias voltage is applied to each of the light receiving elements from one or a plurality of power sources. Electrical signals produced by the light receiving elements in response to input optical pulse signals are superposed on one another to produce one or a plurality of output electrical signals representing a predetermined logic operation with respect to the input optical pulse signals. Depending on the arrangement of its elements, the optical logic operation system functions as an OR circuit, AND circuit, NOT circuit, EXCLUSIVE OR circuit, or half-adder circuit.

REFERENCES:
patent: 3643116 (1972-02-01), Culver et al.
patent: 4689793 (1987-08-01), Liu et al.
patent: 4716297 (1987-12-01), Wills et al.
patent: 4905312 (1990-02-01), Mukozaka
patent: 4973833 (1990-11-01), Takada et al.
"Opto-electronic signal processing element", IBM Technical Disclosure Bulletin, vol. 31, No. 9, Feb. 1989, pp. 218-221.

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