China's New Fibre Lets Data Travel Through Air at 99.7% the Speed of Light
Engineers in Ningxia have put China's first commercial hollow-core fibre links into service between data centres in the Gobi desert. Because light travels through air rather than glass, latency and loss drop by more than 30 percent — a timely upgrade as AI demand strains the country's east-west computing geography.
In the Gobi desert outside Zhongwei, in the northern region of Ningxia, companies from across China have been scrambling for plots. The city is cool, dry and cheap — natural conditions for data centres — and demand for computing power, a CCTV report said on Monday, "exploded" this year. The report also unveiled the region's newest selling point: the first commercial deployment of hollow-core fibre, a technology that changes the physics of how data moves between China's machines.
The problem it addresses is distance. Zhongwei sits more than a thousand kilometres from both the Beijing-Tianjin-Hebei region and the Yangtze River Delta, where most of the demand for that computing lives. Even over the highest grade of conventional fibre, a direct connection takes 20 milliseconds — an eternity for the machines now talking to each other. So communications engineers laid hollow-core fibre between two data centres 30 kilometres apart.
A conventional optical fibre is a thin strand of glass; light slows down inside it, and each bounce off the walls costs a little more. The hollow version inverts that. The new fibre is less than 0.4 millimetres across, its wall embedded with some twenty thinner glass cylinders that guide light down an empty centre — one state-media explainer called it a "maglev track" for light signals. The light travels through air at 99.7 percent of the speed of light in a vacuum, and the report says latency and loss both drop by more than 30 percent compared with conventional fibre.
The deployment is small — a single desert link — but it points at the bigger picture of China's AI build-out. Computing is being pushed west, towards cheap power and land, while users and AI companies cluster in eastern megacities, and every millisecond between the two is a tax on the services in between. Chinese tech bloggers picked up the report within hours, arguing that ultra-low-latency links are what will make remote computing feel local: as one widely shared post put it, the goal is for small firms to rent AI computing by the hour, the way they draw water and electricity, instead of buying servers.
For now the claims rest on state-media reporting rather than independent benchmarks, and hollow-core fibre remains far more expensive than the glass in the ground almost everywhere else in the world. The test to watch is whether the technology stays a 30-kilometre demonstration in the Gobi or spreads into the trunk networks — the difference between a showcase and a system.