What is co-packaged optical CPO

Co-Packaged Optics (CPO) integrates optical and electrical components within the same package to enhance bandwidth, reduce power consumption, and improve data center performance.

Core Characteristics

Integration of Optics and Electronics: CPO places optical components such as lasers, modulators, and photodetectors directly alongside or within the same package as electrical components like switch ASICs or processors. This reduces the physical distance between optical and electrical elements, improving signal integrity and reducing latency compared to conventional pluggable optics . High Bandwidth and Performance: By shortening electrical interconnects, CPO supports higher data rates and throughput, which is critical for next-generation data centers and AI clusters. This integration minimizes insertion loss and enhances overall system performance . Power Efficiency: CPO significantly lowers power consumption by reducing energy loss in long electrical traces. The figure of merit for power efficiency is often measured in power per bit, typically ranging from 1 to 50 pJ/b. This efficiency is particularly important in large-scale AI and high-performance computing environments where energy costs are substantial . Scalability: The architecture allows data centers to connect multiple nodes at high bandwidths, supporting increased data processing and storage demands. It enables dense, high-speed interconnects between GPUs, switches, and servers, facilitating large-scale AI infrastructure . System-Level Considerations: While electrical distances are minimized, the optical portion becomes more demanding. Fiber selection, routing, and integration must account for compact, high-density packaging. This introduces new design constraints for thermal management, signal alignment, and manufacturability . Evolutionary Context: CPO represents the next step in optical integration, evolving from Linear Pluggable Optics (LPO) and Near-Package Optics (NPO). It is particularly suited for environments where density, energy efficiency, and high-speed interconnects are critical . Application in AI and Data Centers: NVIDIA's implementation of CPO demonstrates its role in enabling high-speed inter-GPU communication, supporting up to 1.8 TB/s per GPU with NVLink, and facilitating large-scale AI clusters with improved I/O efficiency . In summary, CPO technology is defined by its tight integration of optical and electrical components, high bandwidth, low power consumption, scalability, and system-level design considerations, making it a key enabler for modern high-performance and AI-focused data centers .