Relativity Networks closed a $22 million SAFE note round backed by Rhapsody Venture Partners, Bell Ventures Inc., Faster Than Glass LLC and other investors, while also securing an unnamed hyperscaler’s $40 million follow‑on commitment. The company’s technology centers on hollow‑core optical fiber, which guides light through a vacuum channel rather than solid glass, allowing photons to travel closer to the speed of light in a vacuum.
According to CEO Jason Eisenholz, a signal that needs five microseconds to cross one kilometre in conventional fiber arrives in just 3.5 microseconds over the same distance in hollow‑core fiber—a 30 % latency reduction. This translates into the ability to span roughly 30 % greater physical separation before latency becomes a limiting factor, a consideration that grows relevant as AI workloads stretch across campus‑scale deployments spanning hundreds of acres and multiple buildings.
- Hollow‑core fiber: light propagates in a central vacuum, reducing refractive index delay.
- Latency: 5 µs/km → 3.5 µs/km (30 % improvement).
- Potential impact: enables larger geographic clustering of data‑center resources without added latency penalty.
Why this matters
Source facts: Relativity Networks reports a 30 % latency reduction (5 µs/km to 3.5 µs/km) using hollow‑core fiber and has secured $22 million in SAFE funding plus a $40 million hyperscaler follow‑on. Inference: By cutting inter‑site delay, the technology can ease power‑grid and siting constraints that currently limit data‑center expansion, allowing operators to locate compute where energy is cheaper or more abundant while still maintaining tight synchronization across distributed campuses. This suggests a shift from pure compute scaling to geography‑aware infrastructure planning.