InP substrates emerge as strategic asset as optical engine supply chain heads for reshuffle

The push toward 1.6T and CPO in AI optical interconnects is elevating InP substrates from a niche material to a strategic chokepoint. Technically, the shift to 4–6-inch wafers forces co-optimization of epitaxy, defect density control, and hybrid integration with silicon photonics—reshaping optical engine architecture. On compliance, U.S. export controls on high-power CW lasers now indirectly constrain InP supply chains; Taiwan, China-based producers may fill gaps but remain exposed if reliant on U.S.-origin tools or software. Competitively, Coherent and Sumitomo Electric are likely to vertically integrate, while Lumentum could pre-commit Taiwanese foundry capacity to hedge against disruption. Over the next 18 months, substrate scarcity will drive 'material-first' procurement, rewarding players with superior MOCVD yield and wafer reclaim capabilities—and potentially triggering cross-border M&A as U.S. and EU subsidies accelerate onshoring, narrowing the window for non-Western suppliers.