Opto-electrical exclusive or logic gates

Details Opto-electrical exclusive or logic gates Opto-electrical exclusive or logic gates

1989-07-17

1990-08-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

377102, H01J 3150

Patent

active

049508822

ABSTRACT:
An opto-electronic XOR gate includes a pair of diode type light sources connected back to back in parallel by a pair of input leads to which first and second electronic logic signals are applied. With only one logic signal in the high state, one of the diode-type light sources is forward biased while the other is reverse biased. With both logic signals high or low neither diode-type light source emits. A two to one fiber optic combiner (FOC) provides a single optical output which is on only when only one electrical signal is high. If an electronic output is desired, a single photodetector converts the output of the FOC to an electronic logic signal. For performing the exclusive OR operation on optical input signals, a pair of photodetectors and buffer amplifiers and connected to the input leads. For 10 to 12 GHz switching speeds laser diodes are used as the diode-type light sources. When lower switching speeds are satisfactory, light emitting diodes can be used as the diode-type light sources.

REFERENCES:
patent: 3348064 (1967-10-01), Powlus
patent: 4504974 (1985-03-01), Rademaker
patent: 4506151 (1985-03-01), MacDonald et al.
patent: 4712089 (1987-12-01), Verber

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