The Color ZR+ 100G QSFP28 PSM DWDM4 is a non-coherent DWDM optical transceiver optimized for cost-effective data center interconnect and metro transport networks. Operating in the C-band with EML-based transmitters, it supports multi-channel DWDM transmission using a simplified direct-detect architecture. The module enables reliable short- to medium-reach DWDM links while maintaining low power consumption and compact QSFP28 form factor.