1000km Optical Cable

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TOKYO - August 12, 2025 - NTT has successfully demonstrated long-haul, high-capacity optical transmission at 160 terabits per second over distances exceeding 1,000 km. 5km by applying large-scale MIMO 1 signal processing technology in a terrestrial field environment in which a 12-core fiber with the same diameter as existing. 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+. Among its possible applications, submarine cables are considered to be the most effective use of multicore optical fiber. The Europe-Russia-Mongolia-China (ERMC) is an Eurasia terrestrial cable route connecting Europe, Russia, Mongolia and China, jointly operated by TTK and China Unicom via, Mongolia Railway. 5km lab-trial using commercial terminal equipment and the demonstration of 1128km/126km reach in full-fill 400/800Gb/s WDM recirculating-loop. The companies say their work indicates that hollowcore fiber cable can be used for high-bandwidth, long-reach applications such as data center interconnect.

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