Key Findings
TSMC (Taiwan Semiconductor Manufacturing Company) has announced the development of ‘COUPE,’ an advanced silicon photonics platform specifically designed for co-packaged optics (CPO) in the AI era. COUPE employs an innovative approach, stacking two distinct dies—a photonic integrated circuit (PIC) and an electronic integrated circuit (EIC)—using TSMC’s proprietary System-on-Integrated Chips (SoIC) bonding technology. By closely placing this optical module next to the XPU (such as CPU or GPU), it aims to dramatically enhance data transfer speeds and power efficiency between AI chips.
Technical / Clinical Details
The core of the COUPE platform is its high-density 3D stacking enabled by SoIC bonding. This minimizes the distance between optical and electrical interconnects, drastically reducing signal propagation delay and power loss. Fully aligned with NVIDIA’s next-generation optical interconnect roadmap, products featuring a 1.6 Terabit per second (Tb/s) optical engine are anticipated to hit the market by 2026. This is a critical component for achieving petabit-scale bandwidth within GPU clusters with minimal heat generation and power consumption. Compared to traditional pluggable optical modules, co-packaged optics enable higher bandwidth density and efficient data transfer over shorter distances, fundamentally addressing bottlenecks in AI systems.
Background & Context
The explosive growth of AI workloads has imposed unprecedented demands on data transfer bandwidth and power consumption in data centers. As Moore’s Law approaches its limits, conventional electrical wiring has struggled to improve both inter-chip communication speed and energy efficiency. To address this ‘copper wall’ problem, the semiconductor industry is decisively shifting towards optical interconnect technologies that utilize photons. The active entry of the world’s largest foundry like TSMC into this domain, in collaboration with AI hardware leaders such as NVIDIA, serves as a strong signal accelerating the industry’s overall transition to optical technology. Other developments, like Marvell acquiring Celestial AI to integrate their Photonic Fabric, and GlobalFoundries establishing silicon photonics facilities, further underscore this trend.
Strategic Significance & Outlook
The emergence of TSMC’s COUPE platform and its alignment with NVIDIA’s roadmap holds immense significance for shaping the future of AI computing. The introduction of products with 1.6 Tb/s optical engines in 2026 will dramatically boost the performance of AI servers and data centers, enabling the deployment of larger and more complex AI models. In the future, co-packaged optics technologies like COUPE may become the standard for AI chip design, fostering new innovations in all fields requiring high bandwidth and low latency, including autonomous vehicles, high-performance computing, and quantum computing. This technological innovation is expected to strengthen the foundation of the information society and accelerate the further evolution of AI.
Source: https://www.techinvestments.io/p/tsmcs-tech-roadmap-outlook-and-the
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