China has recently completed the world's first 1,000-kilometer hollow-core optical fiber bidirectional real-time transmission test, marking a breakthrough in key technologies for next-generation communication networks.

The hollow-core optical fiber used in the test was wound on spools, each containing two to five kilometers of optical fiber. Over 300 such spools were assembled to establish a 1,000-kilometer transmission link for the experiment.

Hollow-core optical fiber technology has already been deployed in the world's first cross-border commercial financial dedicated line using hollow-core fiber, connecting Shenzhen and Hong Kong. More than 10 commercial and pilot projects have also been rolled out in Asia, Europe and other regions.