NPO Silicon Photonics Switch

NPO (Near-Package Optics) switches are a transitional silicon photonics solution that integrates optical engines close to ASICs, offering high performance, lower power consumption, and easier maintenance for modern AI and HPC data centers.

Overview of NPO Technology

NPO, or Near-Package Optics, is a silicon photonics approach designed to improve data center network performance while maintaining compatibility with existing optical module technologies. Unlike Co-Packaged Optics (CPO), which fully integrates the optical engine and switch ASIC on the same substrate, NPO places the optical engine near the ASIC on the switch motherboard, reducing the electrical signal path to the centimeter level. This design significantly lowers insertion loss and power consumption while keeping the optical engine replaceable and easier to maintain .

Key Advantages

• Reduced Power Consumption: By shortening the electrical path between the switch chip and optical engine, NPO lowers SerDes driver power costs and improves energy efficiency .
• High Performance: Supports high-speed interconnects required for GPU clusters and AI workloads, with network access speeds reaching 400 Gbps for next-generation GPUs .
• Ease of Maintenance: The decoupled design allows optical engines to be replaced independently, facilitating multi-vendor collaboration and ecosystem development .
• Rapid Commercialization: NPO leverages existing optical module manufacturing processes, enabling faster market adoption compared to the more complex CPO technology .

Applications in AI and HPC Data Centers

NPO switches are particularly suited for AI and high-performance computing (HPC) environments, where GPU clusters demand high bandwidth, low latency, and energy-efficient networking. They serve as a pragmatic transitional solution before large-scale deployment of CPO, supporting the evolution of data center networks to handle massive generative AI workloads and multi-GPU clusters .

Market and Adoption

The global NPO market is experiencing rapid growth, with revenues reaching $3.8 billion in 2025 and projected to grow at a CAGR of 19.3% from 2026 to 2034, potentially reaching $18.6 billion by 2034. North America leads the market, accounting for over 36% of total revenue . Major manufacturers are adopting NPO as an intermediate step toward fully integrated CPO solutions, balancing performance improvements with ecosystem maturity .

Comparison with CPO

NPO is considered a pragmatic solution that balances performance gains with manufacturability and ecosystem readiness, while CPO represents the long-term, high-integration goal for next-generation optical interconnects .

Conclusion

NPO silicon photonics switches provide a high-performance, energy-efficient, and maintainable solution for modern AI and HPC data centers. They act as a bridge between traditional pluggable optics and fully integrated CPO systems, enabling rapid deployment of high-speed optical networks while preparing the industry for the future of co-packaged optical solutions .