A 40G/100G single-mode single-core optical fiber module is a high-speed optical transceiver that is designed to transmit and receive data at speeds of 40Gbps or 100Gbps over a single strand of single-mode optical fiber. Mouser offers inventory, pricing, & datasheets for Singlemode Fiber Optic Transmitters, Receivers, Transceivers. Whether for use in data centres, telecommunications networks, such as FTTH installations or corporate networks, our modules offer. The secret lies in fiber optic technology, and understanding the basics—1-core, 2-core, Single Mode (SM), and Multi-mode (MM)—is key to mastering this field. Let's break down these terms in simple, clear language with practical examples. This small core lets only one light path go through.