It is a two-port circuit element used to electrically isolate different parts of the audio system while maintaining one-directional coupling via the optical channel. Recognise the advantages and disadvantages of different analogue optocouplers. Image alt: Optocoupler-Optical coupler The figure above depicts a 2x2 coupler with two input ports and. What is an Optocoupler? Let's understand the term Optocoupler. It can be separated as OPTO + COUPLER. In brief, a light source is used as a link between two isolated circuits. Open the URLs, which are collected below, and you will find all the info you are interested in. In audio systems isolation between inputs and higher voltage/current. OPTOCOUPLERS OR OPTOISOLATORS are devices that enable efficient transmission of DC signal and other data across two circuit stages, and also simultaneously maintain an excellent level of electrical isolation between them. Optocouplers become specifically useful where an electrical signal is. Optocoupler is a device that couples an input control signal to output or load, via using light energy, in such a manner that electrical isolation also remains intact between input signals and load (output).