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Silicon photonics integration in Spectrum-X ethernet platform
Monday, January 5, 2026 at 10:33 PM
Developments in silicon photonics technology are linked to Nvidia's Spectrum-X Ethernet platform for AI networking infrastructure.
Context
Nvidia is accelerating the transition to optical interconnects by integrating silicon photonics into its Spectrum-X Ethernet platform, a move designed to support the next generation of "million-GPU" AI factories. By adopting co-packaged optics (CPO) in partnership with TSMC, Nvidia is replacing traditional copper and discrete transceivers with a 3D-stacked silicon photonics engine. This shift addresses the physical limitations of copper, which cannot reliably sustain the 800 Gb/s and 1.6 Tb/s speeds required for massive-scale AI training over long distances.
The new Spectrum-X Ethernet switches, including the flagship SN6800 model, are slated for release in the second half of 2026. These systems are engineered to deliver up to 400 Tb/s of aggregate throughput while providing a 3.5x improvement in power efficiency and 10x greater network resiliency compared to conventional networking. By reducing the number of required lasers by 4x and utilizing liquid-cooled designs, Nvidia aims to drastically lower the energy overhead of data centers, ensuring that more power is available for the GPUs themselves rather than the networking fabric.
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