Optoelectronic switches

Details Optoelectronic switches Optoelectronic switches

1980-12-12

1983-01-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

250211J, G02B 2700

Patent

active

043683851

ABSTRACT:
In an optoelectronic switch, a photodiode is used as an optical-to-electrical converter in which a first semiconductor including a p-n junction is combined with a second semiconductor having a narrower energy band gap than the first semiconductor to form a heterojunction. When supplied with a light signal modulated by an electrical signal, the photodiode becomes ON or OFF depending upon the magnitude of a reverse bias voltage applied to said photodiode. A source for applying the bias voltage to the photodiode comprises two voltage sources of the same polarity or a single voltage source. The optoelectronic switch, has a high isolation ratio and broad transmission bandwidth, consumes little electrical power and produces low cross-talk levels when used in switching arrays.

REFERENCES:
patent: 3508126 (1970-04-01), Newman et al.
patent: 3881113 (1975-04-01), Rideout et al.
patent: 3979587 (1976-09-01), De Cremoux

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