The Color X 400G QSFP-DD PSM4 DWDM4 is built on 4×100G PAM4 silicon photonic MZ modulation technology, enabling high-capacity DWDM transmission in compact form factors. It supports DWDM O-BAND with 200GHz spacing across 33 channels, delivering transmission distances of up to 10km, and up to 30km when used with an external SOA. The module is equipped with an MPO connector, making it well suited for high-density data center and metro interconnect applications.