The 40G QSFP+ transceiver module complies with QSFP+ MSA SFF-8436 and IEEE 802.3ba standards, and the total transmission rate can reach 41.25Gb/s. With low power consumption, small size, high rate and other characteristics. The multimode transceiver module adopts four 10.3125Gbps channel VCSEL laser array optical transmitters and four PIN photo-detector array receivers. The transmission distance of OM3 multimode fiber can reach 300M and the transmission distance of OM4 multimode fiber can reach 400M. The single-mode optical module converts four 10.3125Gbps channels into four CWDM channels (DFB laser array) optical signals, and multiplexes them to 41.25Gbps, which are output from the transmitter through SMF. The receiver receives 41.25Gbps optical signal input and demultiplexes it into 4 CWDM 10.3125Gbps channels. Received by PIN light detector, the transmission distance can reach 40KM, and it is widely used in various Ethernet devices such as switches, routers, data centers.