400G-DR4 QSFP56-DD based on silicon photonics, 8 channels of 50G-PAM4 electrical and 4 channels of 100G-PAM4 optical parallel lanes, single optical port of MPO12, 500m maximum reach via single mode fiber, case temperature range of 0℃-70℃, comply with IEE802.3bs and QSFP-DD MSA standards, and support CMIS. Products are mainly used in 400G Ethernet, data centers and cloud networks.