This article provides a thorough technical treatment of CPO: the physical limits that drive it, the silicon photonics architecture at its core, the standards and MSA landscape governing it, the specific design challenges engineers face, and the deployment roadmap through the 1. 6T . As per-port speeds advance from 800 Gb/s toward 1. 6 Tb/s and beyond, the electrical signaling losses between the ASIC and the optical module consume an increasing fraction of total system power and constrain the practical density of switch systems. Co-Packaged Optics (CPO) addresses this by. This article explains how this new 1. 6T rate emerged, what the technical principles and key features of 1. 6T optical modules are, the major module types involved, and the application scenarios driving adoption. From Jensen Huang showcasing CPO switches at GTC 2025 to a wide range of vendors demonstrating optical engines integrated inside ASIC. The relentless expansion of data communication, propelled by advancements in artificial intelligence (AI) and machine learning workloads, as well as cloud computing, cloud storage, AR/VR, video on demand, 5G technology, the Internet of Things, and autonomous vehicles, demands a substantial increase. According to LightCounting, sales of lasers and photonic integrated circuits for optical transceivers are expected to grow from $2. 9B by 2029, fueled largely by AI data centers.
