Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1982-07-27
1985-03-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
307311, H01J 3150
Patent
active
045061513
ABSTRACT:
Logic circuits employ photoresponsive GaAs field effect transistors to directly drive GaAs laser diodes to provide optical output signals in response to optical input signals. Since the only electrical inputs are DC bias voltages, each such circuit can be readily decoupled, such as for use in electrically noisy environments. The optical output represents a predetermined logic condition in response to a predetermined operating current applied to the laser diode as a result of the operation of the photoresponsive device. Two photoresponsive devices may be used to apply two different operating current magnitudes to the laser diode to produce two different optical output signals.
REFERENCES:
patent: 3599000 (1971-08-01), Yanai et al.
patent: 3696389 (1972-10-01), Fenner
patent: 3995173 (1976-11-01), Sibley
Hara Elmer H.
Hum Robert H.
MacDonald R. Ian
Brophy J. Jon
Goldberg Edward
Her Majesty the Queen in right of Canada as represented by the
Lane Anthony T.
Murray Jeremiah G.
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