Relativity Networks raises $22 million to bring a faster kind of fiber to data centers
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- Relativity Networks raised $22 million in SAFE note funding led by Rhapsody Venture Partners, Bell Ventures Inc., and Faster Than Glass LLC, with the company also securing a $40 million follow-on order from an unnamed hyperscaler.
- Hollow-core fiber transmits light through a vacuum chamber rather than glass, cutting signal travel time from roughly five microseconds per kilometer in conventional fiber to three and a half microseconds.
- CEO Jason Eisenholz framed the shift as a third era of AI infrastructure, following eras that optimized for GPU compute and intra-data-center networking, with the next phase optimizing the geography of where compute sits.
- Data center developers are projected to spend as much as $4 trillion by the end of the decade, but are constrained by political and power-grid limits on where they can build, a constraint hollow-core fiber could partially offset.
- Eisenholz said a 30% latency reduction lets developers span 30% larger distances before latency becomes a problem, positioning multi-campus deployments that knit pre-existing sites into a single synchronized system as a key use case.
Why it matters: Data center developers facing power-grid and political siting constraints now have a technology that effectively expands their buildable geography by roughly 30% at the fiber level, and Relativity Networks has validated commercial demand with a $40 million hyperscaler order on top of its $22 million raise.
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