The Difference Between Single And Dual Fiber Optical Transceiver
Amazon.com: TRENDnet SFP to RJ45 Dual Wavelength Single-Mode LC Module, TEG-MGBS40D3, Must Pair with TEG-MGBS40D5 or a Compatible Module, Up to 40km(24.9 Miles),Standard SFP Slot Compatible,Lifetime Protection : Electronics
Alcatel-Lucent SFP-DUAL-MM Compatible Dual-Speed 100BASE-FX/1000BASE-SX SFP 1310nm 2km DOM Transceiver
Cisco SFP Dual Mode Module
Amazon.com: A Pair of 1.25G/s Bidi Gigabit Multi-Mode Fiber Ethernet Media Converter with 2PCS Bidi SFP LC Dual Transceiver Module Included, 10/100/1000Base-Tx to 1000Base-SX SMF RJ45 to SFP Slot up to 550M