Photonics supply tight
Optics and photonics suppliers are being described as critical bottlenecks for data‑center AI, with Soitec substrates characterized as close to a monopoly for AI optics and Tower Semiconductor reporting rapid photonics growth. (x.com) Tower’s photonics revenue was said to be up about 115% year‑over‑year to a roughly $380M run‑rate, with roughly 70% of capacity pre‑booked through 2028, and analysts are pointing to ASML as the tools 'toll booth' for advanced nodes. ( )
Data-center artificial intelligence is running into a less visible constraint: the optical chips and wafer materials that move data between racks. (towersemi.com) Those links increasingly rely on silicon photonics, which puts light-making and light-guiding parts on a chip so data can travel farther and cooler than through short copper traces. Tower Semiconductor said on February 11, 2026 that demand for its silicon photonics platform helped drive record fourth-quarter 2025 revenue of $440 million. (towersemi.com) Tower said its planned silicon photonics capacity is targeted to exceed five times its fourth-quarter 2025 annualized wafer-shipment run rate, and that more than 70% of that capacity is already reserved or in the process of being reserved through 2028, backed by customer prepayments. (towersemi.com) The company tied that buildout directly to faster optical links for artificial intelligence systems. Tower said on February 5, 2026 that its silicon photonics with Nvidia can deliver up to double the data rate of prior Tower silicon photonics solutions for optical connectivity inside AI infrastructure. (towersemi.com) The substrate under those optical chips is also tightening. Soitec says its Photonics-SOI wafers are used for high-speed data-center interconnect in the Cloud AI market, and the company said on March 19, 2025 that co-packaged optics for AI datacentres can cut energy use by up to 30% by integrating photonics closer to switching silicon. (soitec.com, soitec.com) Soitec’s own filings show photonics demand is no side business. In its fiscal 2025 results, published May 27, 2025, the company said revenue growth in the period was driven by higher sales of Photonics-SOI wafers, supported by sustained cloud-infrastructure investment. (soitec.com) This sits one layer below the graphics processors that have dominated the AI buildout. Yole Group said in September 2025 that silicon photonics and co-packaged optics are moving to the center of next-generation AI data infrastructure as bandwidth demand rises from transceivers to packaging. (yolegroup.com) The manufacturing tools are concentrated too. ASML said in its 2025 annual report that its extreme ultraviolet lithography systems print the smallest features on the most advanced chips and are used on the most critical layers of leading-edge devices, while the company expects EUV revenue to rise in 2026 on advanced logic and dynamic random-access memory demand. (asml.com, asml.com) Tower is still expanding around that demand. On March 25, 2026, it said it would take full ownership of its 300-millimeter Japan facility and use the move to strengthen optical and photonics platforms for high-value growth. (towersemi.com) The result is a supply chain where the pressure point is no longer only the artificial intelligence processor. It is also the light engine, the wafer underneath it, and the lithography tools needed to keep shrinking and shipping both. (towersemi.com, soitec.com, asml.com)
