The Optical Super Highway For AI

Copper interconnect has hit its physical ceiling. When per-GPU bandwidth demand exceeds 8TB/s, electrical signaling's power wall is no longer an engineering optimization—it is an architectural dead end. Optical interconnect is not an optional upgrade; it is the sole pathway scaling AI clusters from thousands to 100,000+ accelerators. The stack is being rewired. InP lasers, silicon-photonics engines, and CPO packaging are displacing pluggable transceivers as the die-to-die interconnect layer. EML and DFB laser capacity will replicate the 2021 HBM shortage: whoever locks in photonic foundry capacity locks in next-gen AI chip shipment rights. Supply-chain exposure is acute. InP epitaxial wafers and high-end optical engines remain concentrated in the US (Lumentum, Coherent) and Taiwan, China (Lian-Tech, Lite-On). Any tightening of export controls will directly stall global AI datacenter buildout. Domestic module players hold 800G share, but CPO's moat sits in silicon-photonics design and advanced packaging—not assembly. Broadcom's CPO switch and NVIDIA's NVLink optical roadmap will collide head-on by 2026. Intel, failing to deliver on silicon-photonics foundry commitments, risks total marginalization in AI interconnect. Verdict: LPO is a 2H25 transition window; CPO is the endgame. The real bottleneck is not optics—it is opto-electronic co-packaging yield. That single metric determines who ships 100K-card clusters.