Optical modules are usually affixed with labels covering information such as manufacturer, production date, module type, transmission distance, and serial number to help customers identify them. As an essential component of optical fiber communication, optical modules are optoelectronic devices that facilitate the conversion between optical and electrical signals during the transmission process. An. Home / Blogs / How to identify the model numb. An optical module is a typically hot-pluggable optical transceiver used in high-bandwidth data communications applications.