A Startup Just Raised $22 Million to Make Internet Pipes 30% Faster
Relativity Networks announced $22 million in new funding on August 18, 2026, bringing its total known fundraising to roughly $38.7 million. The company makes a special kind of fiber-optic cable that could speed up connections inside data centers — the large facilities that power cloud computing and AI services. The round drew participation from Rhapsody Venture Partners, Bell Ventures Inc., and Faster Than Glass LLC, among others. TechCrunch
The funding arrives alongside a $40 million follow-on order from a leading cloud provider that declined to be named. That order matters because it shows the technology is moving beyond testing into real, large-scale purchasing. Until now, this kind of fiber has mostly existed in research labs.
Here is the core idea. Standard fiber-optic cables transmit data as light through solid glass. Relativity Networks makes what is called hollow-core fiber, which sends light through an empty tube — a near-vacuum — in the center of the cable instead. Because light travels faster through air than through glass, signals arrive sooner. CEO Jason Eisenholz estimates that a signal takes about five microseconds to travel one kilometer in conventional fiber, compared with three and a half microseconds in hollow-core fiber. That is roughly a 30% reduction in latency — the delay before a signal arrives. TechCrunch
A fraction of a microsecond might seem trivial. But inside the massive AI systems being built today, thousands of connections run in parallel between processors. When you shave a little time off each of those thousands of links, the savings add up across the entire system. The technology reaches up to 90 kilometers (56 miles), per the company's July 2025 announcements, positioning it for connections within a data center campus or between nearby facilities, not for cross-country routes. PR Newswire
Relativity Networks has been building toward mass production for over a year. The company signed a partnership with Prysmian, a major cable manufacturer, in March 2025 to produce hollow-core fiber at scale. That deal, announced March 21, 2025, was aimed at meeting growing data center demand. Reuters; Data Center Dynamics
Before this latest round, Relativity Networks had raised $6.1 million in earlier funding. The company said that money went toward meeting data center demand for faster fiber. Its patent-pending cable was already being used to expand data center capacity as of February 2025. Relativity Networks; PR Newswire
The financial backdrop is large. Data center developers are expected to spend as much as $4 trillion by the end of the decade, with AI infrastructure absorbing a significant share. Within that buildout, the cables connecting densely packed processors have become a bottleneck. Standard fiber cannot go faster than the physics of glass allows — glass slows light to about two-thirds of its speed in a vacuum. Hollow-core fiber gets around that limit by sending light through air instead.
The concept itself is not new. Researchers have studied the structures needed to guide light through an air-filled core for over two decades. Early versions struggled with signal loss, manufacturing difficulty, and fragility compared with standard telecom fiber. The open question is whether Relativity Networks and Prysmian have solved those problems well enough to produce the cable in the large quantities and with the reliability that cloud providers demand.
The $40 million order from the unnamed cloud provider is the strongest signal so far that at least one major operator has moved past testing. The funding structure, called a SAFE note, delays setting a company valuation until a future funding round, which suggests Relativity Networks may be preparing for a larger raise as production grows.
What remains unanswered is the cost per meter at production scale, how much signal the cable loses compared to standard fiber, and whether the 90-kilometer range holds up in real-world conditions rather than controlled tests. Those are the numbers that will determine whether this technology spreads beyond a few cloud giants into broader use.
For now, Relativity Networks has a manufacturing partner, fresh capital, and a large order from a major cloud provider. That makes it the most visible company trying to commercialize a technology that has long promised faster data transmission. The next twelve to eighteen months of real deployments will show whether the science holds up at scale and delivers a lasting advantage.
