YOFC Unveils Hollow-Core Fibre for AI Era

Hollow-core fibre (HCF) guides light through an air-filled central channel instead of a solid glass core. Because light travels approximately 47% faster in air than in silica glass, this design fundamentally reduces signal propagation delay by about a third compared to conventional fiber. This speed advantage translates to a latency of around 3.33 microseconds per kilometer, a significant improvement over the roughly 5 microseconds per kilometer typical of standard fiber. For distributed AI training and inference workloads, this reduction in latency is critical for maximizing GPU efficiency and enabling real-time responses. Beyond speed, HCF technology offers other key performance benefits. It can handle higher optical power with nonlinear effects 3 to 4 orders of magnitude lower than solid-core fiber, and recent designs have demonstrated attenuation levels lower than traditional fiber, enabling longer transmission distances with less need for amplification. The technology is moving from labs to live networks. In June 2024, YOFC and China Mobile launched the world's first 800G hollow-core fiber transmission test network in Guangdong, demonstrating a 128Tb/s throughput over a 20km link under real-world operational conditions. This progress is prompting standardization efforts. In November 2023, a proposal was submitted to the ITU-T to begin formal discussions on hollow-core fibre technologies, indicating a move toward creating international standards for this new infrastructure. Hyperscalers are also taking notice, with Microsoft already deploying its own version of HCF to connect Azure data centers. The technology's ability to extend the distance between data centers by up to 50% allows for greater flexibility in site selection, enabling placement in areas with lower energy costs or access to renewable power. Looking ahead, HCF is viewed as a foundational technology for 6G networks, where its ultra-low latency and high throughput are expected to be essential for next-generation mobile applications.