Radiant energy – Photocells; circuits and apparatus – Signal isolator
Patent
1975-09-10
1978-02-14
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Signal isolator
250578, G02B 2700
Patent
active
040741427
ABSTRACT:
An optical cross-point switch is disclosed which has the capability of connecting any of a multiplicity of input signals to any of a multiplicity of output lines, in any order in a non-interfering and non-blocking manner. The cross-point switch includes n input circuits (where n is an integer greater than one) and an output circuit associated with each input circuit. An n array of light emitting diodes is connected to each input circuit for transforming input electrical signals applied to the input circuits into optical radiation. A photosensor is connected to each output circuit for transforming incident optical radiation into output electrical signals. A lens, or fiber optic, system is disposed between the light emitting diodes and the photosensors for focusing optical radiations eminating from each array of diodes onto a separate photosensor. An input and output address decoding and selection circuit is coupled to each array of light emitting diodes to selectively enable one diode of each array so that each input circuit may be electro-optically coupled to a selected output circuit.
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