400G QSFP-DD DR4 is a transceiver module designed for 500 m optical communication applications, and it is compliant with QSFP-DD MSA, IEEE 802.3-2018 400GBASE-DR4 and 400GAUI-8 standards. The 425 Gigabit signal is carried over four parallel lanes by one wavelength per lane. This module can convert 8-channel 53.125 Gbps electrical data to 4 parallel channels of optical signals, each supporting 106.25 Gbps data transmission. Reversely, it can convert 4-channel 106.25 Gbps optical signals to 8-channel electrical output data on the receiver side.