A single mode SFP transceiver is a hot-swappable optical module designed to transmit and receive data over single mode fiber (SMF). It is commonly used in Ethernet and fiber optic networking equipment such as switches, routers, and media converters. Example reach: a 10G SFP + at 1310 nm typically reaches ~10 km; at 1550 nm similar optics can reach 40–80 km, and specialty OS2 optics extend to ~200 km+ under ideal. Single-mode optical fiber transceivers are an essential component in fiber optic communication systems, which transmit data through optical fibers using light. multimode transceivers, you'll find that singlemode fiber cabling systems are suitable for long-reach data transmission applications, thanks to low fiber attenuation and low dispersion penalty.