According to industry experts, the two terms refer to the same type of device—an essential component used to electrically isolate circuits while allowing signal transmission through light. The figures below show the principal internal structures of a photocoupler and an OCMOS FET. Unlike transformers or capacitors, which can only transfer AC signals across the isolation barrier, optocouplers can. Understand exactly what photocouplers, optocouplers & optoisolators are and how they are used in electronic circuit designs to provide optical linking whilst providing electrical isolation. Home » Electronic components » this page Optocouplers can be described by a variety of different names. Optocouplers, also known as opto-isolators, uses infrared light to transfer electrical signals between two electrically isolated circuits and are commonly classified by their photosensitive output device What is an Optocoupler? An optocoupler (also called an opto-isolator, photo-coupler, or optical. This document outlines the basic characteristics and application design of general-purpose transistor output photocouplers (optical isolators). As semiconductor devices, the transfer of signals is.