How is Soitec responding to surging demand and limited capacity for the Photonics SOI wafers used in AI data center optical networking, and what do its deposit backed, fixed price, multi year capacity reservation agreements require—including the expected signing timeline, volume

Soitec is using its dominant position in Photonics‑SOI to convert a capacity bottleneck into committed, prepaid demand: it is reserving multi-year output through fixed-price agreements while expanding existing production rather than immediately building a new fab. The approach reflects a wider AI supply-chain shift toward long-term, financing-backed commitments for scarce components. 1

Soitec’s reservation agreements

• Soitec expects about 80% of its more than 10 photonics customer capacity-reservation agreements to be signed within one to two weeks, and the balance within about a month. 1
• The agreements set a fixed price for an agreed wafer volume and require a cash deposit, paid in stages as customers ramp production. 1
• A customer that purchases its committed volume receives its deposit back; a customer that falls short forfeits the deposit. 1
• Volumes above the contracted commitment are not automatically supplied at the fixed price: they reopen pricing negotiations. 1
• Customers must share inventory data, intended to prevent them from reserving excess supply merely to deny wafers to competitors. 1

Why Soitec has leverage

• Photonics‑SOI is the substrate beneath nearly all silicon-photonics chips, which use optical links to move data in AI infrastructure as copper becomes less attractive on power and performance grounds. 1
• UBS estimates Soitec has roughly 95% of this market. 1
• Soitec says Photonics‑SOI revenue should more than double from slightly above $100 million in fiscal 2026—implying more than $200 million—and its CEO characterizes that figure as a floor. 1
• Its share price had nearly quadrupled in 2026 as AI optical-networking demand accelerated. 1

Capacity response

• Soitec says existing capacity can cover this year and next year through three nearer-term levers: reallocating shared, underused production capacity among businesses; improving output/yield; and adding tools in existing cleanroom space. 1
• It can use part of a French facility originally built for silicon-carbide production, and it has qualified customers for high-volume Photonics‑SOI at its 300 mm Singapore facility. 1
• The company is geographically diversifying production: it produced Photonics‑SOI only in France until roughly five months earlier, then qualified Singapore. 1
• An unequipped Singapore building could be fitted out instead of constructing a new fab; a decision is expected within six to 12 months. Soitec does not currently expect to require a new plant until about 2029 and sees no immediate need for a U.S. fab. 1

Broader AI supply-chain implication

• The arrangement is evidence that the AI constraint is no longer only leading-edge GPU fabrication: it includes optical substrates, advanced packaging and memory. TSMC projects more than 80% annual CoWoS-capacity growth from 2022 to 2027 and plans nine phases of wafer-fab and advanced-packaging facilities in 2026. 7
• Despite such expansion, reported industry estimates still put the CoWoS supply-demand gap near 10% by end-2026; the precise size of Nvidia’s share of CoWoS demand and the claimed “ninefold” expansion are not supported by the evidence provided here. Insufficient evidence.
• The economic pattern is clear: buyers are increasingly accepting multi-year commitments, deposits, prepayments, and other financing arrangements to secure supply, while suppliers use those commitments to reduce the investment risk of adding capacity. Soitec’s contracts are a particularly strict version because they combine fixed committed volumes, forfeitable deposits, inventory transparency, and repricing above the allocation. 1