Cisco SFP-10G-LR module is the single-mode 10G fiber optical transceiver, the SwitchTechSupply 10G Base-LR Module supports a link length of 10 kilometers on standard single-mode fiber (SMF, G.652) and SFP-10G-LR SFP Plus optical transceiver from Solid-Optics offers up to 10Km link length on standard single-mode fiber.