QSFP 40G LR4 It is designed to operate over singlemode fiber system using four 10Gbps CWDM channel in 1300 band. Which is supports 40Gbps data rate links of up to 20km.
40G QSFP
40G QSFP+ Transceiver modules which provide four channels of data in one pluggable interface. Each channel is capable of transferring data at 10Gbps and supports a total of 40Gbps.