Tower Semiconductor bets on Japan to ride the AI data center shift from copper to light

Tower Semiconductor’s $3B bet on photonics in Japan reflects a strategic conviction that AI data centers will pivot from electrical to optical interconnects. This move pressures upstream suppliers of InP lasers and silicon photonics while forcing OSATs to adopt co-packaged optics (CPO). Japanese government backing lowers capex risk, yet U.S.-led export controls on critical tools could inflate long-term supply chain costs. Competitors like TSMC, GlobalFoundries, and Intel will likely accelerate in-house silicon photonics development or acquire startups to close the gap. Within 18 months, if NVIDIA and Broadcom finalize optical I/O standards, Tower may secure anchor clients; if not, it risks stranded assets. This is less a tech play and more a state-backed gamble against timing uncertainty.