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NADDOD introduces a new range of 400G Digital Coherent QSFP-DD transceivers with three variants: ZR (QDD-400G-ZR) for 400G 120Km DCI DWDM applications, ZR Plus (QDD-400G-ZR+) for 100G/200G long haul and 300G/400G Metro IP over DWDM, and ZR+ Pro/High Power (QDD-400G-ZRP+) is an enhanced version of the currently available QSFP-DD ZR+ Optical Module leveraging the same operational modes but providing as a major enhancement the increase of the Tx Optical Power up to +1dBm (EoL). All variants are designed to operate without inline chromatic dispersion compensation.