An optical module primarily consists of optoelectronic devices, functional circuits, and optical interfaces. The core optoelectronic devices include the Transmitter Optical Sub-Assembly (TOSA) and the Receiver Optical Sub-Assembly (ROSA), with lasers and detectors forming the core. Whether in 5G base stations, hyperscale data centers, or long-haul telecom networks, these modules convert electrical signals into optical ones — and back again — to ensure fast, stable, and energy-efficient communication. Through this article, you will know the details of the components and structure of the optical transceiver modules.