A New Milestone in Optical Networking
Chinese fiber manufacturer YOFC recently announced a significant breakthrough in optical communication: a successful field trial of hollow-core fiber transmission. The project, conducted in collaboration with China Telecom and equipment maker Dekoli, achieved a data transmission rate of 51.3 Tb/s across a distance of 206.5 km without the need for signal regeneration.
Unlike standard fiber optic cables that utilize a solid silica core, hollow-core technology transmits signals through air-filled channels. This structural innovation allows light to travel at higher speeds while mitigating many of the optical distortions that typically constrain transmission efficiency over long distances.
Technical Breakthroughs and Efficiency
The research team managed a throughput of 1.2 Tb/s per wavelength over the entire 206.5 km span. According to the developers, this experiment represents the first-ever field deployment combining such high-capacity wavelengths with this specific reach. Previous attempts to achieve similar transmission speeds were typically restricted to much shorter distances, often around 20 km.
To achieve this, engineers utilized adaptive allocation techniques to fine-tune channel rates and optical power across different wavelengths. This strategy helped manage signal losses caused by gas absorption effects inherent to air-guided signals. Furthermore, the team successfully utilized high-power erbium-doped fiber amplifiers capable of a 33.5 dBm output, avoiding the need for more complex remote-pumped amplification systems.
«The demonstration establishes the highest unrepeatered wavelength division multiplexing capacity ever achieved under real-world conditions,» the researchers noted.
Ensuring Reliability in High-Power Transmission
Operating at optical power levels approaching 2.24 W presents significant technical risks. To address these, the team integrated a comprehensive suite of safety protocols, including:
- Continuous anomaly detection systems.
- Automated shutdown functions to protect hardware.
- Alarm-triggered responses to prevent equipment failure.
Impact on AI Infrastructure
This achievement comes at a critical time as the global demand for AI-driven data processing continues to surge. Large-scale GPU clusters are increasingly bottlenecked by network performance rather than just raw computing power. By reducing latency and increasing bandwidth capacity through hollow-core fiber, operators could potentially distribute data centers across greater geographical distances without compromising the performance of AI training and inference tasks. While other global competitors are also developing similar hollow-core ecosystems, this trial highlights a major step toward practical, large-scale deployment of next-generation optical infrastructure.