Hardware
Light-speed links: photonic interconnects reach volume AI deployment
Optical chip-to-chip links are shipping in production AI clusters, attacking the data-movement bottleneck that now dominates training costs.
By Daniel Reyes, Chips & Infrastructure Editor — EINDHOVEN
EINDHOVEN — Light has gone to work inside the AI datacenter. Co-packaged optical interconnects — lasers and photonic circuits fused directly onto accelerator packages — are now shipping in volume production clusters, the technology's first real deployment after a decade of premature announcements.
The target is the modern bottleneck: at cluster scale, moving activations between chips consumes more energy than computing them. Optical links cut that energy per bit several-fold while extending high-bandwidth reach from millimetres to metres — loosening the tyranny of physical proximity in cluster design.
Yield and serviceability remain the watch items — a failed laser in a fused package is costlier than a failed cable — but with training runs now grid-scale projects, every percentage point of interconnect efficiency is measured in megawatts.
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