The 400G-ZR module is built for long-haul transmission, reaching up to 80 km using coherent optical technology. • This is the baseline OIF 400ZR standard for 400 Gbps coherent pluggables. It's fully open-standard, enabling multi-vendor interoperability, and is. n the router-pluggable QSFP-DD format. This is an extended-reach variant supporting distances up to 2 km–10. Our family of ZR and ZR+ pluggable transceivers provides cost-efficient coherent transmission up to 400Gbit/s line speeds. Incorporating the latest silicon photonics and DSP technology, our coherent pluggable optics feature highly compact QSFP28 (100G ZR/ZR+) and QSFP-DD form factors (400G ZR/ZR+). Cisco QSFP-DD and OSFP 800G ZR/ZR+ digital coherent optics modules enable 800G traffic over amplified Dense Wavelength-Division Multiplexing (DWDM) links up to 120 km for 800ZR and over 1000 km for 800G ZR+. Coherent optical transmission manipulates three different light properties: amplitude, phase, and.