200G PAM4 QSFP-DD optical Transceiver series complies with IEEE 802.3CN 200GBASE Ethernet protocol, 200GAUI-8 C2C interface standard and QSFP-DD MSA standard protocol specification. Based on 4-channel LAN-WDM wavelength division multiplexing technology and using DSP PAM4 modulation the transmission data rate is as high as 212.5Gbps and supports 10km to 40km single-mode optical fiber transmission.  It meets RoHS 6 environmental protection requirements and is mainly applied to 5G back hauling transmission networks and metro networks.