China Telecom Research Institute, Changfei Company, and ZTE, jointly completed the world's first 1,000-kilometer air-core optical fiber two-way real-time transmission verification: on the 1007.48-kilometer air core optical fiber link, the extended C+L band single-wave 800Gb/s single-fiber bidirectional transmission was achieved, with a total capacity of 128 Tb/s, pushing the distance record for real-time transmission of air core optical fiber to a new level, marking another landmark breakthrough in the key core technology of next-generation optical fiber communication.

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