OEM – Opto-Electronic Memory. These are devices that use light – visible, ultra-violet or infra-red – signals and properties to store and retrieve data. They feature optical-to-electrical and electrical-to-optical transduction.

OEM more generally stands for Original Equipment Manufacturer and OEMs manufacture and supply IT systems and components for use by upstream suppliers. The Opto-Electronic Memory use of OEM is specific to the memory area.