On the hardware side, the researchers built a high-power amplifier using a cascaded dual-gain-unit architecture and a multi-element doping design, achieving a maximum output of 33.5 dBm (roughly 2.24 W) while maintaining flat gain across the operating band. That higher-power, flatter amplification helped stretch an unrepeatered span without resorting to the remote-pumped amplifiers the team was trying to avoid. Because pushing that much power over a live optical link carries a real risk of failure, the system was wrapped in safeguards, including optical-path power anomaly detection, automatic interlock shutdown, and alarm-linked response mechanisms to catch faults before they damage equipment.
The stakes in this trial, and in HCF more broadly, tie directly to the AI buildout. As hyperscalers race to stand up ever-larger GPU clusters, the network linking those clusters, inside data centers and across the long-haul links between facilities, is fast becoming the bottleneck . HCF's lower latency lets operators site facilities farther from expensive, power-constrained hubs without a speed penalty, while its capacity headroom helps move the enormous traffic AI training and inference generate . The same properties make it attractive for latency-sensitive workloads like financial trading.
That promise is already pulling in serious money, mostly from the West. Microsoft , which moved early via its 2022 Lumenisity acquisition , struck manufacturing deals with Corning and Heraeus in September 2025 to scale production across Azure. AWS has developed its own HCF, claiming a 30% latency improvement over standard fiber, and says it wants more than it can currently get. Corning also has fiber deals with Microsoft, Meta, and Lumen, and is expanding in North Carolina with Nvidia's backing . Trials like YOFC’s are closing existing gaps toward full, widespread HCF deployment, though China's progress largely sits outside the Western supply chain now forming.
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Etiido Uko is a news contributor for Tom's Hardware covering the latest updates in big tech and the PC industry. He is a mechanical engineer and senior technical writer with over nine years of experience in documentation and reporting. He is deeply passionate about all things engineering and technology, and is an expert in gadgets, manufacturing, robotics, automotive, and aerospace. ","collapsible":{"enabled":true,"maxHeight":250,"readMoreText":"Read more","readLessText":"Read less"}}), "https://slice.vanilla.futurecdn.net/13-4-24/js/authorBio.js"); } else { console.error('%c FTE ','background: #9306F9; color: #ffffff','no lazy slice hydration function available'); } Etiido Uko Social Links Navigation News Contributor Etiido Uko is a news contributor for Tom's Hardware covering the latest updates in big tech and the PC industry. He is a mechanical engineer and senior technical writer with over nine years of experience in documentation and reporting. He is deeply passionate about all things engineering and technology, and is an expert in gadgets, manufacturing, robotics, automotive, and aerospace.
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- https://www.tomshardware.com/networking/chinas-hollow-core-fiber-trial-pushes-51-3-tb-s-over-128-miles-without-signal-regeneration-milestone-targets-ai-era-networking-bottlenecks#main
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