nEye.ai Raises $80M Series C to Bring Optical Circuit Switching to AI Data Centers

nEye.ai has raised $80 million in a Series C round led by Sutter Hill Ventures, with participation from CapitalG, M12 (Microsoft's venture fund), and Socratic Partners. The funding brings the company's total capital raised to $152 million and will be used to scale manufacturing and deepen its penetration into AI data center deployments. The announcement was made on April 14, 2026.

The core technology replaces portions of the traditional electrical switching stack with optical circuit switches built on a single chip — combining silicon photonics, MEMS (micro-electromechanical systems), and CMOS into an integrated design. This approach allows data centers to create flexible, software-defined optical fabrics that dynamically pool GPU, CPU, and memory resources across racks rather than locking them into fixed electrical topologies. The result is dramatically higher utilization of expensive AI compute hardware and lower latency in workloads that require tightly coordinated communication between accelerators.

AI training and inference workloads are notoriously sensitive to network bottlenecks. As models grow in scale and GPU clusters expand to thousands of chips, the interconnect fabric becomes a critical performance determinant. Electrical switching architectures were not designed for the all-to-all communication patterns that characterize modern distributed AI workloads. Optical circuit switching offers orders-of-magnitude improvements in bandwidth density and power efficiency for these use cases.

nEye.ai is betting on a foundry-based manufacturing model that leverages existing semiconductor fabs, making its technology easier to scale than custom photonic hardware built in specialized facilities. The optical circuit switching market is projected to surpass $3 billion within three years, according to the company, as hyperscalers look for ways to make their AI infrastructure more efficient without waiting for the next generation of electrical interconnects. The round positions nEye.ai as a leading contender in what is fast becoming one of the most strategically important subsectors in AI hardware.