World Record Achieved in Transmission Capacity and Distance

"An international research team led by the Photonic Network Laboratory at the National Institute of Information and Communications Technology (NICT, President: TOKUDA Hideyuki Ph.D.), and including Sumitomo Electric Industries, Ltd. (Sumitomo Electric, President: INOUE Osamu) have set a new world record in optical fiber communications, achieving data transmission at 1.02 petabits per second over a distance of 1,808 kilometers (roughly equivalent to the distance from Sapporo to Fukuoka, from Missouri to Montana or from Berlin to Naples). The experiment used a specially designed 19-core optical fiber with a standard 0.125 mm cladding diameter , compatible with existing fiber infrastructure. With a capacity-distance product of 1.86 exabits per second x km—the highest ever recorded —this demonstration marks the fastest long-distance transmission achieved in any optical fiber to date. The result represents a major step forward in developing scalable, high-capacity networks and addressing the world’s growing demand for data."

https://www.nict.go.jp/en/press/2025/05/29-1.html