With the advent of the age of cloud computing and big data, the network is being forced to develop at a high rate and density, and the utilization of virtualized servers is increasing. In order to provide sufficient I / O (input / output) bandwidth, many new access switches have been developed to 2 or 4-port 40G Ethernet that can connect to core switches. The rapid development of interconnected data transmission is inseparable from the 40G QSFP + optical Transceiver, because it can provide sufficient bandwidth to ensure unhindered data conversion, thereby meeting the network requirements of data centers and enterprise campuses.