10G Media Converter - Convert Dual Fiber 10G SFP+ to Single Fiber Link - using WDM SFP+ modules
SFP Optical Module, 1.25G SFP Transceiver Single Mode Support DDM Single Fiber with Dust Plug for Internet Cards for Router : Amazon.co.uk: Computers & Accessories
LBEC SFP Fiber Optic Module 1.25G Low Power SFP Transceiver Single Fiber Single Mode 1.25G 1550nm for Switch