Hollow Core Fiber: Prysmian and Relativity Networks deploy their highest density HCF cable to date

• Testing confirms the reliable deployment of a hollow core fiber cable in DuraLine microducts

• Hollow Core Fiber (HCF) cables are available now for AI data center deployment

Prysmian and Relativity Networks have reached a new milestone in the deployment of highdensity cable solutions incorporating Relativity Networks' ChronoCore™ hollow core fibers, successfully completing high-density cable deployment tests in collaboration with Dura-Line, a leading manufacturer of high-density polyethylene (HDPE) conduit solutions.

Testing at Dura-Line’s flagship test facility in Clinton, Tennessee confirmed the reliable installation of a high-density cable incorporating Relativity Networks' ChronoCore™ hollow core fibers at jetting speeds of up to 350 ft/min—demonstrating the technology’s readiness of the solution for real-world deployment and marking a meaningful technical step forward for the development of cutting-edge AI optical infrastructure and data center networks.

The cable, based on Prysmian's Sirocco™ cable architecture and incorporating Relativity Networks' ChronoCore™ hollow core fibers, combines Prysmian's expertise in high-density cable design and manufacturing with Relativity's breakthrough hollow core fiber technology. The solution delivers the expected optical performance while supporting the development of next-generation low-latency data center infrastructure.

Srinivas Siripurapu, Chief Innovation and Sustainability Officer of Prysmian: “This milestone comes just 15 months after Prysmian’s partnership with Relativity Networks to industrialize hollow core fiber—and reflects Prysmian’s long-standing leadership in innovation. We worked closely with Relativity Networks and Dura-Line to achieve this important industry milestone to showcase the scalability and technological readiness of this innovative digital infrastructure.”

Rodrigo Amezcua Correa, CTO of Relativity Networks: “A breakthrough fiber technology only matters if it can be manufactured, cabled, and deployed at scale - and this milestone proves that it can. Seeing ChronoCore™ HCF produced and installed while delivering the performance it was designed for – to enable the next generation of distributed AI – marks the transition from innovation to infrastructure. Together, Relativity Networks and Prysmian are accelerating the adoption of hollow core fiber for the low latency AI and data center networks of the future.”

Prysmian is already scaling production of Relativity Network’s hollow core fiber, including investments in its Eindhoven facility, while its Claremont, North Carolina plant has successfully manufactured the cable with 24 hollow core fibers in a 10mm diameter cable, meeting customer attenuation requirements. This is an essential step forward for the major US data center market.

“Dura-Line has been synonymous with innovation for over 50 years, and our global network of testing facilities positions us as a key partner to those companies pushing the boundaries of what’s possible in optical networking” added Jason Brabec, Global Director Field Application Engineering, Dura-Line.

About Hollow Core Fiber

In a hollow core fiber, a glass waveguide guides light through an air-filled core. Because the speed of light in air is faster than the speed of light in glass, hollow core fiber transmits data nearly 50% faster than traditional glass communications fiber, minimizing latency in timecritical applications.

One specific use case is data center interconnect, where the transmission speed of traditional glass optical fibers limits the distance between data centers in a synchronized cluster to 60 km. Deployment of hollow core fiber could allow data center operators to extend that distance to 90 km (56 miles), enabling optimized data center siting where land, power, and water are all in short supply.