Researchers from Japan's National Institute of Information and Communications Technology (NICT), in collaboration with five international scientific partners, have demonstrated a new world record in optical data transmission, achieving a throughput of 450 terabits per second over an already deployed urban fiber-optic infrastructure. For the first time, such a high data transmission speed was achieved not under laboratory conditions, but on a realistically operated backbone network constructed on the basis of standard telecommunication fiber.

The obtained result surpassed the previous laboratory records of 402 and 430 terabits per second, recorded in 2024 and 2025, respectively.