CPO optical modules put optical and electronic parts together. They make the signal path much shorter, from centimeters to millimeters. This can cut power use by up to half. CPO technology lets more data fit in. Co-Packaged Optics (CPO) is a technology and design approach where optical components, such as lasers and photodetectors, are integrated alongside electrical components, like Application-Specific Integrated Circuits (ASICs), within the same package. This integration significantly reduces the. Co-packaged optics is an innovative technology that enables the integration of optical components directly into a switch ASIC package (shown in the below figure) aimed at addressing next-generation bandwidth and power challenges. CPO technology lets more data fit in a small space. Co-packaged optics (CPO) is an approach that aims to address growing challenges around bandwidth density, communication latency, copper reach, and power efficiency in today's data-hungry networks by bringing key elements needed for communication closer together — namely optics and electronics. This article explains how CPO works, how it compares to pluggable and near-packaged optics, and what its benefits and challenges are.