Relativity Networks Raises $22M to Bring 30% Faster Hollow-Core Fiber to Data Centers

TL;DR

• Relativity Networks has raised $22 million to commercialize and deploy its hollow-core fiber technology specifically designed for data centers.
• Its hollow-core fiber transmits data nearly 30% faster than conventional solid glass fiber by guiding light through air instead of glass, drastically cutting latency.
• The funding signals growing demand for ultra-low-latency infrastructure to support AI workloads, cloud computing, and next-generation data center interconnects.

A Long-Overlooked Fiber Tech Gets Its Moment

For decades, the internet has run on solid glass fiber. It's reliable, it's everywhere, and it's hitting its physical limits. Now a rarely deployed alternative is getting a major vote of confidence. Relativity Networks, a startup pioneering hollow-core fiber, has secured $22 million in new funding to bring its breakthrough technology into the heart of the data center — where every microsecond counts.

The investment marks one of the largest bets yet on hollow-core fiber as a practical, scalable solution for AI and cloud infrastructure, moving the technology from niche telecom experiments to mainstream commercial deployment.

What Makes Hollow-Core Fiber 30% Faster?

Traditional optical fiber works by sending light through a solid core of glass. Even though that light moves incredibly fast, it’s still slowed down by the glass itself — by about 30% compared to the speed of light in air.

Hollow-core fiber flips that design. Instead of glass, it uses an empty, air-filled central channel surrounded by a highly engineered microstructure that guides light through the air. Because light travels faster in air than in glass, data can move at nearly the speed of light in a vacuum — roughly 1.5 times faster than in conventional single-mode fiber.

The result is not just raw speed, but ultra-low latency. For data traveling between servers, between data centers, or between AI accelerator clusters, that latency reduction can be transformative. The fiber also offers lower signal distortion, reduced nonlinearity, and the ability to carry higher power levels, which are critical advantages as data rates push toward 800G, 1.6T and beyond.

Why This Technology Has Stayed on the Sidelines

If hollow-core fiber is so much faster, why isn’t it everywhere? Until recently, the challenges outweighed the benefits.

Manufacturing hollow-core fiber is significantly more complex than drawing conventional fiber. It requires precise, intricate glass structures to confine light in air without leaking, and early versions suffered from higher signal loss and were difficult to splice and install with standard equipment. Costs were high, and for most telecom and enterprise applications, conventional fiber was simply good enough.

That equation is changing. Advances in design, particularly in anti-resonant and nested anti-resonant hollow-core fibers, have dramatically reduced attenuation and improved reliability. At the same time, the demands of modern computing have made latency a primary bottleneck, not just bandwidth. Relativity Networks has focused on solving the last-mile manufacturing and deployment hurdles, developing fiber that is compatible with existing data center infrastructure while delivering the latency advantage.

Inside the $22M Plan for Data Centers

Relativity Networks plans to use the $22 million to scale production, expand its team, and accelerate deployments with data center operators and hyperscale cloud providers. Rather than targeting long-haul telecom routes first — the traditional focus for fiber innovation — the company is going directly to where latency matters most: inside and between data centers.

In these environments, even nanoseconds add up. The company’s hollow-core fiber is being positioned for data center interconnects, high-performance computing fabrics, and intra-campus links where shaving microseconds off transmission time can improve overall system performance. The funding will also support further development of low-loss splicing and connectorization techniques to make installation as seamless as plugging in conventional fiber.

Why AI and Cloud Infrastructure Need It Now

The timing is no coincidence. The explosion of AI training and inference workloads has created an unprecedented need for fast, tightly coupled clusters of GPUs and accelerators. In these distributed systems, thousands of chips must constantly exchange massive amounts of data. Latency between nodes directly limits training speed and model performance.

A 30% reduction in fiber latency translates to faster synchronization across AI clusters, lower response times for real-time inference, and more efficient utilization of expensive compute hardware. For cloud providers, financial trading platforms, and large-scale AI labs, that speed advantage is a competitive edge.

Beyond AI, hollow-core fiber could reshape cloud infrastructure more broadly. As edge computing, quantum networking, and disaggregated data center architectures grow, the ability to move data with near-light-speed latency becomes foundational. Lower latency also means less need for complex compensation and buffering, simplifying network design and reducing power consumption.

The Road to Ultra-Fast Connectivity

Relativity Networks is not alone in exploring hollow-core fiber, but its data-center-first strategy sets it apart. While major fiber manufacturers have demonstrated hollow-core for long-distance trials, Relativity is betting that the most immediate and valuable market is inside the data center walls.

If deployment scales as planned, hollow-core could become the new standard for performance-sensitive links, coexisting with conventional fiber for less latency-critical connections. Industry analysts see this as the beginning of a broader shift toward specialized fiber types optimized for different parts of the network.

For now, the $22 million raise is a clear signal: the era where hollow-core was a laboratory curiosity is over. As AI pushes the limits of what current infrastructure can handle, sending light through air instead of glass may be the simplest and most powerful upgrade yet.

AndroGuider Team

Articles written by the AndroGuider team. We try to make them thorough and informational while being easy to read.