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Co-packaged optics (CPO) technology can integrate photonic integrated circuits (PICs) with electronic integrated circuits (EICs) like CPUs and GPUs on a single platform. This advanced technology has immense potential to improve data transmission efficiency within data centers and high-performance computing environments. CPO systems require a laser source for operation, which can be either integrated directly into the silicon photonic chips (integrated laser sources) or provided externally.

While integrated laser sources allow for dense CPO integration, ensuring consistent reliability can be challenging, which may affect overall system robustness. The use of external laser sources (ELS) in CPO, in comparison, offers improved system reliability.

Single-mode waveguides are crucial components of many PICs, where they help couple light from an external laser to the PIC or distribute optical signals within the system. They are cost-effective and mechanically flexible, besides being highly compatible with electrical circuits. Therefore, they show significant potential for use in CPO systems utilizing ELS.

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