Definitions for "Opto-isolator"
An electronic component that contains a light source, usually in the form of an LED, and a light sensing device. When current flows, the LED emits light, which is detected by the light sensor. Opto-isolators are used to replace switches and relays. The big advantage of opto-isolators (also called opto-couplers) is that they have no electrical connection, helping cut down on ground loops.
a device that uses optical techniques to electrically isolate two related circuits, typically a transmitter and a receiver
An opto-isolator consists of a light emitting diode that is located next to or close by a phototransistor. Commonly used within a feedback loop in order for a power supply to achieve electrical isolation between input and output. An opto-isolator functions by using a signal path from an electrical to optical to electrical signal transformation.