Relativity Networks raises $22 million to bring a faster kind of fiber to data centers

Relativity Networks raised $22 million in SAFE-note financing from investors including Rhapsody Venture Partners and Bell Ventures, and secured a $40 million follow-on order from an unnamed hyperscaler. The company’s hollow-core fiber transmits light through a vacuum, cutting per-kilometer latency from about five microseconds to 3.5 microseconds—roughly a 50% speed gain. This reduction could allow data-center campuses to be spaced up to 50% farther apart while maintaining synchronization, enabling larger multi-campus AI deployments.