10G SFP+ Duplex LC SFP Module Single Mode 5Km Optical Fiber Module 1310Nm f D7N6 4712480792868 | eBay
TP-Link Gigabit SFP module | 1000Base-LX Single-mode Fiber Mini GBIC Module | Plug and Play | LC/UPC interface | Up to 10km distance (TL-SM311LS): Amazon.co.uk: Business, Industry & Science
SFP1000LXST | StarTech.com MSA Compatible LC Single Mode Transceiver Module, Full Duplex, 1000Mbit/s | RS