Huh, 50% faster. https://spie.org/news/photonics-focus/julyaug-2022/speeding-light-with-hollow-core-fibers https://spie.org/news/photonics-focus/julyaug-2022/sp

Huh, 50% faster. https://spie.org/news/photonics-focus/julyaug-2022/speeding-light-with-hollow-core-fibers https://spie.org/news/photonics-focus/julyaug-2022/speeding-... The immediate allure of hollow-core fibers is that light travels through the air inside them at 300,000 km-per-second, 50 percent faster than the 200,000 km-per-second in solid glass, cutting latency in communications. Last year, euNetworks installed the world’s first commercial hollow-core cable from Lumenisity, a commercial spinoff of Southampton, to carry traffic to the London Stock Exchange. This year, Comcast installed a 40-km hybrid cable, including both hollow-core and solid-core fiber, in Philadelphia, the first in North America. Hollow-core fiber also looks good for delivering high laser power over longer distances for precision machining and other applications.