In the case of chips for optical transmission technology, a distinction is made between those that are made up only of optical components and do not contain any electronic components and those that combine optical and electronic components.
Chips without electronic components are Optical Integrated Circuits( OIC), the others that contain both optical and electronic components are Opto-Electronic Integrated Circuits (OEIC) and functionally correspond to Photonic Integrated Circuits( PIC).
OEIC, consisting of a photodiode and an impedance converter, photo: The High Speed Electronics Group.
Electronic components are usedin various optical components to drive optical functions. Examples include E/O converters and O/E converters, or optical amplifiers that convert optical signals into electrical signals and amplify them. In these and other circuits, the overall system is opto-electronically mixed. Technologically, it would be possible to build such opto-electronic circuits completely monolithically as OEICs, but the costs would stand in the way of an economical solution.