Serenity, the stock-picker tracked here for his bet that the AI boom will be won or lost in the obscure upstream corners of the optics supply chain, kept his attention today on a single name: Lumentum (LITE). The company is a large U.S. maker of lasers and optical components that feeds the hyperscalers' networking gear, and Serenity treats it as the safe, large-cap incumbent of his dominant investing theme — AI photonics and optical interconnect.

What caught his eye was commentary from Lumentum's chief executive at an industry photonics forum. According to the remarks Serenity relayed, management expects that as co-packaged optics (CPO) and near-packaged optics ramp into 2027, Lumentum will be able to supply only a fraction of what customers want — undershipping demand by roughly 70%, with supply and demand not expected to come back into balance until the end of the decade. (CPO is the technique of placing the optical light engine right next to the switch or GPU die to cut power and lift bandwidth; it is central to the next wave of data-center networking.)

For Serenity, that is less a one-company headline than confirmation of his core framework. He back-maps demand from the roadmaps of Nvidia and the hyperscalers, then hunts for the smallest upstream supplier — a laser maker, a substrate or an epiwafer vendor — that the whole buildout quietly depends on. A statement that even a well-capitalized incumbent cannot physically keep up is, in his reading, exactly the kind of chokepoint signal he looks for: when the biggest player is capacity-constrained, demand has to spill over to anyone else with light-source capacity coming online.

He drew the obvious conclusion that other players able to add laser capacity are likely to attract more investor attention from here. That ties directly to the higher-upside small-cap photonics names he benchmarks against Lumentum — the indium-phosphide laser and substrate specialists he favors for leveraged exposure to the same shortage.

Serenity has previously disclosed Lumentum at roughly a 5% weight in his photonics sleeve, holding it as a quality long tied to Google TPU optics and broad hyperscaler spending, while flagging risks around its locked-up multi-year laser supply agreements. Today's note added no position change — just a reinforced read that the supply squeeze he has been positioning for is now being said out loud by the incumbents themselves.