CXP is the fiber optic transceiver with a high integration level for data communication. It works for 100G Ethernet and chassis interconnections equipped with 12 channels. These 12 channels achieved the duplex transmission for both receiving and sending signals which greatly enhanced the transmission speed. And it supports multirate transmission up to 12.5Gbps per channel. CXP is 45mm long and 27mm wide which is a little bigger than XFP packaging. Up till now, the technology for CXP is still in progress, but it will become the development tendency for the use of fiber optic transceivers.