The reason why the fiber optic transceiver received so much attention, because it has so many advantages in contrast to other way of communication, for example large capacity, long distance transmission, small size, light weight, easy to construct and keep, are less expensive and so on. In the following I must possess a brief introduction of 40G QSFP Module and CFP module.The 40GBASE QSFP+ (Quad Small Form-Factor Pluggable Plus) modules offer customers a multitude of high-density 40 Gigabit Ethernet connectivity options for data center, high-performance computing networks, enterprise core and distribution layers, and repair provider transport applications In addition to 40Gbps Ethernet interconnects, it can be used in datacom/telecom switch, and router connections, as well as data aggregation and backplane applications. Also you can possess a wide selection of other transceivers at Fiberstore.com, including xfp transceivers, CFP modules, sfp transceivers and so on.Source from How Much Do You Know 40 Gigabit QSFP+ TransceiverAvago Technologies is the first fiber optic module vendor to product release a fully compliant 40Gb Ethernet QSFP+ optical transceiver. Leveraging its history in delivering 850nm VCSEL based solutions, Avago QSFP+ modules deliver excellent high speed optical / electrical performance coupled with low power dissipation. Using bundled fiber cables and MPO connectors, port density is triple that of SFP+ modules, and power consumption is reduced from 1000 mW maximum per lane for SFP+ to 375 mW maximum per lane for QSFP+.