Nippon Telegraph and Telephone (NTT) and four Japanese manufacturing partners are building a pilot line for optical chiplets, small packages that move data between processors as light instead of electrical signals. Their stated target is more than ten times the productivity of today's research-stage process. The useful signal is the scope: the project covers photonic devices, silicon photonics, packaging, testing, and inspection rather than treating the optical link as a component that someone else will learn to assemble later.
Each partner owns a manufacturing step. NTT Innovative Devices will work on chiplet production, test, and packaging. Japan Semiconductor will adapt silicon photonics for mixing different materials in one package. Furukawa Electric will develop the light-producing compound-semiconductor devices, while Shinko Electric will build the package process and inspections that run during assembly. The pilot line gives those teams one place to find whether a design can be built repeatedly, not just demonstrated once in a laboratory.
Optical links are attractive because electrical connections consume more power as processors exchange more data, but a difficult assembly process can erase that advantage in cost and yield. This project is worth watching for the first published yield and test-time numbers. If the group can show the tenfold productivity target on the pilot line, optical chiplets move from a packaging research topic toward something system designers can put on a production schedule.