Laser diodes that generate the light optical links carry between AI servers. They sit upstream of optical transceiver and co-packaged optics assembly and depend on indium phosphide wafers and III-V epitaxy. Supply tightens when transceiver makers cannot source enough qualified high-speed lasers.
A sustained tight read means transceiver and co-packaged optics builders cannot source enough qualified high-speed laser diodes to complete the optical links between AI servers, so module assembly waits on laser allocation rather than on wafer or board supply. The available read is cohort revenue across laser and networking suppliers: it tracks how hard that supply base is being worked, not qualified laser output directly. Relief arrives only as new indium phosphide and epitaxy capacity qualifies and ramps, over quarters rather than a single order cycle.