As deep learning models distribute workloads across tens of thousands of GPUs, traditional copper cabling has become an acute networking bottleneck. Commercial deployments of Co-Packaged Optics (CPO) network switches are stepping in to bridge the gap with direct on-package silicon photonics.
Replacing Copper Traces with Optical Engines
By mounting optical transceiver dies directly onto the same multi-chip substrate as the switching ASIC, CPO eliminates lengthy electrical trace pathways on circuit boards. This architectural shift slashes physical interface power consumption by up to 30% while scaling aggregate backplane throughput past 51.2 Tbps per switch node.
Data center architects anticipate that optical switching fabrics will prove vital for training future multi-trillion-parameter foundation networks without hitting thermal density walls.