Ayar Labs Closes $500M Round as AI Infrastructure Race Accelerates

Ayar Labs closed a $500 million Series E round on March 3, valuing the MIT spinout at $3.8 billion and intensifying the race to solve AI computing's biggest hardware bottleneck: moving data between chips.

Why Light Beats Copper for AI

Ayar Labs replaces traditional copper interconnects inside servers with silicon-photonic optical links. Data travels as light rather than electrical signals, delivering four to twenty times more computing throughput per watt, according to the company. As AI clusters scale from training into inference workloads, copper's physical limitations have become a binding constraint on performance.

"We're solving one of the biggest hardware issues that's causing bottlenecks in AI," CEO Mark Wade said. Former Intel CEO Pat Gelsinger, who serves as a company advisor, pioneered optical interconnect research two decades ago at Intel's labs.

Who's Betting on Optical

The round was led by Neuberger Berman, with participation from MediaTek, the Qatar Investment Authority, ARK Invest, Insight Partners, and Sequoia Capital. NVIDIA and AMD — both existing backers — participated again, bringing Ayar Labs' total funding to $870 million.

The company is not alone. Celestial AI raised $250 million for competing optical interconnect technology. NVIDIA has separately invested $2 billion across Coherent and Lumentum, signaling that major chipmakers are hedging across multiple optical approaches rather than picking a single winner.

The Grant Angle: SBIR and Federal Research Dollars

The optical interconnect sector has significant overlap with federal research priorities. DOE and DARPA fund silicon photonics R&D through SBIR/STTR programs, and the recent $150 million DOE Science Cloud initiative will require high-bandwidth interconnects to support its AI workloads.

Small businesses developing optical, photonic, or advanced interconnect technologies should watch DARPA's monthly SBIR topic pre-releases and DOE Office of Science funding announcements. Granted tracks these opportunities across agencies, making it easier to match technical capabilities to open solicitations before deadlines close.