Alcatel-Lucent SFP-DUAL-SM10 Compatible Dual-Speed 100BASE-FX/1000BASE-LX SFP 1310nm 10km DOM Transceiver
Amazon.com: A Pair of 1.25G Gigabit Ethernet Fiber Media Converters with SFP LC Single Core Transceiver Module, Single-Mode LC, SMF RJ45 to SFP Slot up to 30KM, 10/100/1000Base-Tx to 1000Base-SX (2 Pack) :
QSFP vs SFP Form Factor: What is the Difference? - Store.QSFPTEK