SFP-7020-WB - Gigabit Ethernet BiDirectional single strand WDM SFP transceiver, Tx:1550nm/Rx:1310nm, type B, max range 20Km, single LC connector
Amazon.com: 1.25 Gigabit Single Mode LC Duplex Transceiver,1000Base-LX Dual Fiber SFP Module,1310nm SMF, up to 10 km,DDM,Compatible with Cisco, Ubiquiti, Mikrotik,Netgear, Dlink,Linksys and More (1000M, x1) : Electronics