A device that uses a short optical Transmission path to transfer a signal between elements of a circuit, typically a Transmitter and a receiver, while keeping them electrically isolated since the signal goes from an electrical signal to an optical signal back to an electrical signal, electrical Contact along the path is broken.

These optical Coupling devices bridge the gap between incompatible wire communications systems. It contains an input amplifier, a light-emitting diode, a photodiode and an output amplifier.

Also known as an optical coupler, an optocoupler, an optical isolator, an optically coupled isolator, an optoelectronic isolator, a photocoupler or a photoisolator.

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