927-km End-to-End Interoperable 400-GbEthernet Optical Communications through 2-km 400GBASE-FR4, 8×100-km 400G-OpenROADM and 125-km 400-ZR Fiber Lines

For the first time, we report an end-to-end interoperable optical transmission of 400-GbE data flows on 927-km through 2-km 400GBASE-FR4, 8×100-km 400G-OpenROADM and 125-km 400-ZR fiber line sections that use the latest developed 400G QSFP-DD and CFP2 optics. © 2022 The Author(s)