SFP+
SFP + is an enhanced small factor pluggable transceiver developed from SFP for use at bit rates up to 16Gbps. It was first standardized in 2006 as a simple electrical/optical converter, but now have the advanced functionality as an XFP (as CDR and tunable DWDM). SFP+ is a very popular 10G transceiver due to the compact size. It is used for Ethernet, Fiber Channel, SDH, CPRI, and more.