1.25G BiDi SFP is a compact, hot-pluggable optical transceiver that utilizes bidirectional (BiDi) technology to transmit and receive 1.25 Gbps data signals over a single strand of single-mode fiber. This module is specifically designed for fiber-scarce environments in FTTH access networks, enterprise backhaul, and network expansion projects, providing a cost-effective migration path while maintaining full Gigabit Ethernet performance and compatibility with standard SFP interfaces.