Direct:
Taiwan now treats optical interconnect as strategic national infrastructure, the same category as its leading-edge logic. The Executive Yuan approved a Ten AI Initiatives plan on January 28, 2026, and silicon photonics landed in the critical-technologies tier next to quantum and AI robotics. The stated aim is global leadership in co-packaged optics, ultra-broadband, and low-power components, coordinated across the NDC, MOEA, MODA, and NSTC.
The driver is bandwidth density. As GPU clusters scale, the electrical links between accelerators run into a power-and-reach wall, and copper stops being economical past a certain bandwidth-distance product. Optics is the answer at that point. TSMC (TSM) has been building toward it with COUPE, which uses SoIC-X to stack an electrical die directly on a photonic die. TSMC claims 5-10x better power efficiency and 10-20x lower latency for the design over conventional approaches, with CoWoS-based CPO integration targeted for volume production in 2026.
The interesting part is what the state is trying to backstop, because the hard problems are not the foundry's. TSMC's own packaging lead has named three: wafer-level optical testing, fiber array unit integration, and high-speed optical packaging assembly. Those live across the supply chain. Materials and lasers come from global specialists like Coherent (COHR) and Sumitomo Electric (5802.T), test from Advantest (6857.T), and a long tail of smaller Taiwanese houses handles assembly and components. Pulling that layer onshore is the actual ambition behind the policy language.
Execution is the open question. NSTC warned on January 2, 2026 that budget delays could sideline Taiwan right as the CPO window opens, and an initiative like this loses most of its value if it stalls in the first year. Samsung (005930.KS) is moving on a parallel track, optical engines in 2027 and turnkey CPO by 2029, and it is pitching the full stack under one roof, HBM plus foundry plus packaging plus photonics, which TSMC cannot match because it does not make its own memory.
The connection back to memory and storage is capital. This is the same AI-infrastructure spending wave pulling HBM and advanced packaging tight, and optical interconnect now competes for the same money and engineering talent.
Drafted with AI assistance against parallel reporting.
Sources:
- DigiTimes, “Taiwan AI industry plan targets silicon photonics as new moat” (June 10, 2026)
- Taiwan National Development Council, Ten AI Initiatives Promotion Plan 2025-2028 (Executive Yuan approval January 28, 2026)
- TrendForce / Commercial Times, TSMC COUPE volume production and CPO scaling challenges (April 1, 2026)
- The Elec, Samsung Foundry silicon photonics roadmap, OFC 2026 (March 2026)
- DigiTimes, NSTC budget-delay warning on SiPh/CPO (January 2, 2026)
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