Ayar Labs Raises $500 Million Series E for Silicon Photonic Chips Backed by NVIDIA and AMD
Ayar Labs, an MIT spinout developing silicon-photonic chips to replace copper interconnects in data centers, closes a $500 million Series E led by NVIDIA and AMD at a $3.8 billion valuation — validating the industry shift from electrical to optical data center connectivity.
Ayar Labs, an MIT spinout developing silicon-photonic chips that replace copper electrical interconnects with optical connections inside data centers, has closed a $500 million Series E funding round co-led by NVIDIA and AMD. The round values the company at approximately $3.8 billion and signals that the two largest GPU manufacturers view optical interconnects as critical to the next generation of AI infrastructure.
The Technology
Ayar Labs' chips use light instead of electricity to transmit data between processors, memory, and networking components within data centers. The company's TeraPHY optical I/O chiplets can be integrated directly into processor packages, providing bandwidth densities that exceed copper interconnects by an order of magnitude while consuming significantly less power per bit transmitted. For AI training clusters where thousands of GPUs must communicate at maximum bandwidth, the performance and power advantages of optical interconnects become decisive.
Why NVIDIA and AMD Are Investing
Both NVIDIA and AMD are facing the same fundamental challenge: their GPUs are increasingly powerful, but the interconnects between them are becoming the bottleneck. NVIDIA's NVLink technology already uses high-bandwidth connections between GPUs, but copper-based interconnects have physical limits on bandwidth and distance that constrain the scale of GPU clusters. By investing in Ayar Labs, both companies are securing access to optical interconnect technology that could remove this bottleneck, enabling GPU clusters with tens of thousands of chips communicating at optical speeds.
Market Trajectory
The $500 million raise brings Ayar Labs' total funding to approximately $750 million and positions it alongside Lightmatter and Celestial AI as leading companies in the optical interconnect space. The data center optics market is projected to exceed $30 billion by 2028, driven by AI infrastructure demand. Ayar Labs plans to use the funding to scale manufacturing and expand its partnerships with chip designers and data center operators who are preparing for the transition from electrical to optical connectivity.
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