Apple Watch sensor demand and InP supply tightness lift TASC's 2H26 outlook

InP tightness is not a cyclical capacity issue—it is a structural collision between AI optical transceivers and consumer photonic sensing competing for the same scarce substrate. TASC's order acceleration signals Apple is elevating optical sensing from a "feature accessory" to a core compute element. Rising per-device sensor density points to non-invasive glucose monitoring and micro-spectroscopy entering pre-mass-production. Upstream, InP epi-wafer capacity is concentrated among a handful of MOCVD equipment makers, with Taiwan, China and Japan dominating. As 800G/1.6T datacenter optics demand surges in parallel, a substrate-level "AI-consumer double squeeze" is inevitable. The 2H26 shortage will likely persist into mid-2027. Competitively, Apple's long-term volume commitments lock TASC as primary supplier, neutralizing ST and Bosch's MEMS inertial-sensing moats in the optical lane. Substrate players like IQE and AXT face reverse price compression from end-brand bargaining power. The 12-24 month wildcard: if next-gen Watch integrates micro-LiDAR or near-IR spectroscopy modules, InP demand jumps an order of magnitude. Global substrate gaps could trigger a supply-chain repricing event analogous to the 2021 silicon wafer crunch.