Co-Packaged Optics (CPO) achieves this by packaging the optical transceivers (often referred to as photonic chiplets) with the ICs on the same silicon substrate; this significantly reduces the length of the electrical path between optics and the electrical ICs, which in turn reduces. Co-Packaged Optics (CPO) achieves this by packaging the optical transceivers (often referred to as photonic chiplets) with the ICs on the same silicon substrate; this significantly reduces the length of the electrical path between optics and the electrical ICs, which in turn reduces. NVIDIA's co-packaged optics (CPO) switches with integrated silicon photonics are the world's most advanced networking solution for the era of agentic AI. Replacing pluggable transceivers with silicon photonics on the same package as the ASIC, NVIDIA CPO innovations provide 5x better power. This article provides an in-depth overview of the advantages of CPO and its critical components, including the silicon photonic engine, external lasers, fiber arrays, polarization-maintaining fibers, and MPO connectors. It also introduces several key companies involved in the field and outlines the. At this year's OCP Global Summit, “Co-Packaged Optics (CPO)” became a frequently mentioned buzzword. With the continuous expansion of ultra-large model training scale and AI compute clusters, data centers face increasingly acute conflicts regarding power consumption, bandwidth, and architecture. " Research from the IEEE International Solid-State Circuits. Co-packaged optics (CPO) is a disruptive approach to increasing the interconnecting bandwidth density and energy efficiency by dramatically shortening the electrical link length through advanced packaging and co-optimization of electronics and photonics. CPO is widely regarded as a promising.