Lumentum — AI supply-chain exposure

Lumentum makes the lasers and photonic components that turn electrical signals into the light pulses moving data between AI systems. Its parts sit inside the optical transceivers that interconnect servers and switches, and it works in exotic materials like indium phosphide that make high-speed lasers possible. As clusters grow, the optical layer carrying traffic between accelerators becomes a genuine constraint, and Lumentum supplies its light source.

Its hook is specialised materials and laser know-how that few rivals match, giving it durable positioning in optical interconnect even as it depends on transceiver and switch makers to reach the datacenter. The model places it in the materials layer because it is upstream — an enabling component maker whose fortunes rise with optics demand but whose margin sits below the finished-module vendors it feeds.