Ayar Labs, which is developing optical interconnect tech to boost speeds on high-performance computer systems, raises $35M Series B
Kyle Wiggers / VentureBeat :
Context & Ripple Effects
This $35M Series B is the early marker in what became the most heavily funded arc in optical interconnects: Ayar Labs went on to raise a $130M Series C with Nvidia and Intel as investors, then a $500M Series E at a $3.8B valuation as it pursued replacing copper wiring in semiconductors with fiber optics.
The round also seeded a now-crowded category. Celestial AI later raised a $100M Series B for optical interconnects across compute, memory, and data transmission, while Xscape and OpenLight followed with silicon photonics rounds of their own — all chasing the same bottleneck between processors that copper can't carry.
First-order effects
- Ayar Labs gets the capital to move its optical interconnect chips from development toward high-performance computing systems, targeting speed limits that copper wiring imposes on processor-to-processor links.
Second-order effects
- Strategic chipmakers validated the thesis by investing directly: Nvidia and Intel's participation in the later Series C tied the leading GPU and CPU vendors into Ayar's interconnect roadmap rather than leaving them to buy it later.
- Rivals read the funding signal and raised against it — Celestial AI's $100M Series B, Xscape's $44M Series A, and OpenLight's $34M Series A turned optical interconnects from one bet into a funded competitive field.
Third-order effects
- If the pattern holds, data center and HPC interconnects consolidate around silicon photonics suppliers, with copper's role in high-speed chip-to-chip links steadily ceded — and the chipmakers who invested early positioned as the integration point.
The trend: Optical interconnects are drawing escalating capital — from Ayar Labs' $35M Series B to its $3.8B-valued Series E — as the industry's answer to copper's speed ceiling in high-performance computing.