Optical interconnect startup Eliyan raises $145M in funding to solve the AI chip cluster connectivity crunch

Summary

Optical interconnect startup Eliyan has closed a $145 million Series C funding round at a $1 billion valuation, positioning itself as a key player in solving the growing connectivity bottleneck facing AI chip clusters. The round was led by Seligman Ventures, with participation from Cisco Ventures and Lumentum.

Why it matters

As AI models scale to larger parameter counts and training workloads intensify, the interconnect layer between chips has become a critical performance constraint. Traditional electrical interconnects struggle to keep pace with the bandwidth and latency demands of modern GPU and accelerator clusters. Eliyan's focus on optical interconnect technology represents a fundamental shift in how data moves between chips — using light instead of electricity to transmit data across cluster nodes. This could unlock significant performance gains for large-scale AI training and inference workloads.

The involvement of Cisco Ventures is particularly noteworthy, signaling that networking infrastructure giants see optical interconnects as a strategic investment rather than a niche play. Lumentum's participation further reinforces the credibility of the approach, given the company's deep expertise in photonic components.

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Impact on AI tools/models

Eliyan's technology could have downstream effects on how AI infrastructure is designed and deployed. Faster, more efficient interconnects between chips mean clusters can operate closer to their theoretical peak performance, reducing training times and operational costs. For model developers and researchers, this translates to the ability to train larger models more efficiently. The funding round also validates the optical interconnect approach as a serious contender against established electrical interconnect solutions, potentially accelerating adoption across the industry.

What to watch

The optical interconnect space is heating up, and Eliyan's $1 billion valuation places it firmly in unicorn territory. Key developments to track include whether Eliyan can transition from prototype to production-scale deployments, how its technology compares to alternatives from companies like Ayar Labs and Lightmatter, and whether major cloud providers adopt its solution at scale. The broader trend of moving beyond electrical interconnects for AI clusters is likely to intensify as model sizes continue to grow. For ongoing coverage of the AI infrastructure landscape, explore our AI news section and check out our rankings for the latest tool evaluations.

FAQ

What problem does Eliyan solve? Eliyan addresses AI chip cluster connectivity challenges through optical interconnect technology, replacing traditional electrical connections with light-based data transmission.

Who invested in Eliyan's Series C? Seligman Ventures led the round, with Cisco Ventures and Lumentum participating as investors.

What is Eliyan's valuation? Eliyan achieved a $1 billion valuation in its Series C funding round, making it a unicorn in the optical interconnect space.