YOFC to Unveil Hollow-Core Fibre for AI Data Centers

By guiding light through an air-filled channel instead of a solid glass core, hollow-core fiber (HCF) allows signals to travel nearly 50% faster, reducing latency by about 30%. This translates to a delay of around 3.3 microseconds per kilometer, compared to approximately 5 microseconds for traditional solid-core fiber. For AI clusters distributed across multiple data centers, this speed increase is critical for minimizing GPU idle time and maximizing training efficiency. The technology isn't new, but recent breakthroughs have brought attenuation (signal loss) to levels comparable with, or even lower than, conventional silica fiber. State-of-the-art HCF demonstrates losses around 0.05 dB/km, a significant improvement over the 0.14 dB/km plateau for solid-core fiber. This lower loss reduces the need for power-hungry optical amplifiers, directly impacting data center operational costs. YOFC's announcement signals a move toward mass production and commercial viability. The company has previously deployed an 800G hollow-core fiber test network and claims to be ready for large-scale manufacturing of extended-length, ultra-low-loss HCF. The MWC launch event will feature Professor David Payne, often called the "Father of Fibre Lasers," and a panel including experts from ZTE, The Hong Kong Polytechnic University, and Fujikura. Despite the performance gains, widespread HCF adoption faces hurdles. Manufacturing the micro-structured, air-filled core is more complex and costly than producing standard fiber. Handling and splicing the more fragile HCF cables also require specialized techniques and equipment to avoid collapsing the delicate internal structure. An entire ecosystem of compatible connectors, splicers, and amplifiers is needed to support broad deployment. Major cloud providers are already deploying HCF for metro-scale connections between AI data centers. Microsoft has installed over 1,280 kilometers of a proprietary "double nested" hollow-core fiber (DNANF) to connect its Azure data centers in Europe, carrying live traffic. This push is driven by the need to decouple data center site selection from user proximity, allowing facilities to be built in locations with cheaper land and abundant renewable energy without a latency penalty.