The 1000BASE-BX-U 3km TX1310nm/RX1550nm Simplex LC/UPC BiDi SFP Optical Transceiver Module is a high-quality, cost-effective SFP transceiver designed for Gigabit Ethernet single-fiber bidirectional communication. It transmits at 1310 nm and receives at 1550 nm, enabling full-duplex data transmission over a single strand of singlemode fiber (SMF) for distances up to 3 km.