Ayar Labs Secures $150M More in Series E Funding to Scale Optical Interconnect Technology

Ayar Labs Extends Series E Funding to $650 Million

Ayar Labs, a Silicon Valley startup developing optical interconnect technology for AI chip clusters, announced it has raised an additional $150 million, extending its Series E funding round to $650 million1

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. The company originally disclosed $500 million in March, which was led by Neuberger Berman with participation from chip giants Nvidia, AMD, and MediaTek2

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. With this extension, Ayar Labs has now raised just over $1 billion in outside funding, underscoring investor confidence in its mission to replace copper interconnects in next-generation AI infrastructure2

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Why Optical Interconnects Matter for AI Data Centers

Copper interconnects have become a critical bottleneck in AI data centers, suffering from three fundamental limitations: distance constraints, excessive power consumption, and overheating issues2

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. Data signals degrade over longer copper cable distances, making them unsuitable for large-scale deployments. When AI clusters expand to thousands of graphics processing units, the energy requirements of copper wiring become economically unsustainable2

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. Additionally, copper wires frequently overheat when connected to multiple high-performance processors, causing workload failures that disrupt operations.

Ayar Labs addresses these challenges through co-packaged optics technology that links AI chips directly with fiber optical cables, avoiding the thermal problems inherent to copper connections1

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. The company's TeraPHY product delivers greater bandwidth, enhanced performance, improved power efficiency, and lower latency compared to traditional copper solutions2

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. By placing the TeraPHY Optical Engine directly into server ASIC sockets alongside GPUs, Ayar Labs enables much larger chip clusters that can support increasingly complex foundation models2

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Racing Toward 2028 Volume Production

CEO Mark Wade told Reuters the company is racing to bring optical technology to market as early as 2028, with volume production targets set for the end of 20271

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. "We build the optical chip, and our optical chip gets fed into our customer's product," Wade explained. "If my customers' products are looking to ramp in the 2028-2029 time frame, we have to have all of our stuff qualified for volume production by the end of the 2027 time frame"1

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. The additional funding has already enabled Ayar Labs to open a chip design center in Bengaluru, India, and will support product preparation through next year1

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Wade emphasized the urgency: "Copper interconnect is becoming the limiting factor for AI scale-up. This funding allows us to move faster on manufacturing-ready co-packaged optics at scale. We're deepening our work across the foundry and packaging ecosystem and growing our engineering capacity to support customer programs worldwide"2

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Strategic Partnership with Wiwynn Corp

Taiwanese cloud data center equipment maker Wiwynn Corp joined Ayar Labs' backers, making a strategic investment earlier this year1

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. The partnership focuses on delivering optically connected, rack-scale AI systems capable of supporting hyperscale workloads using SuperNova remote light source technology integrated directly into Wiwynn's rack-level server architecture2

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Wiwynn President and CEO William Lin stated: "Co-packaged optics is a foundational technology for the next generation of AI and cloud data centers. Through our collaboration and investment with Ayar Labs, we see a clear path to new architectures that reduce the power and complexity limits of copper interconnects, powering rack-scale deployment for the next wave of hyperscale AI data centers"2

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Secondary Transaction Values Company Above $5 Billion

Concurrent with the Series E extension, Antero Peak Group at Artisan Partners led a secondary share purchase of $225 million from early employees and investors, valuing Ayar Labs at more than $5 billion1

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. Sequoia Global Equities, ARK Invest, and Greycroft participated in that transaction1

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. Chris Smith, founding portfolio manager of the Antero Peak Group at Artisan Partners, noted: "From our perspective, the AI infrastructure and optical interconnect industry is at a major inflection point, with optical scale-up solutions poised to ramp through the end of the decade"1

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Founded in 2015, Ayar Labs operated quietly for years before raising $35 million five years after its inception2

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. The AI boom has created urgent demand for optical interconnects, attracting backing from chipmakers like Nvidia, AMD, and MediaTek who stand to benefit directly from larger, more efficient chip clusters2

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. Watch for product announcements in late 2025 and early partnerships that signal commercial readiness ahead of the 2028 market launch.