Hollow-Core Fiber Cuts Data Center Latency 30% by Routing Light Through Vacuum

Relativity Networks' hollow-core fiber transmits light through a near-vacuum core instead of solid glass, reducing signal latency roughly 30% versus conventional fiber. CEO Jason Eisenholz cites 3.5 microseconds per kilometer versus five in standard fiber. In AI training clusters, where GPU-to-GPU round-trip latency constrains utilization, that delta compounds across thousands of parallel links. An unnamed hyperscaler has placed a $40 million follow-on order, and the company raised $22 million in SAFE funding on August 18, 2026.