AI supply-chain thesis — mapping bottlenecks, focus companies, and supply-chain exposure for investors.
**Bottleneck theme:** Photonics / CPO **Focus:** $COHR — COHERENT CORP. Coherent ($COHR) is the most vertically integrated photonics franchise in public markets — it grows its own InP substrates and epi, fabricates EML and CW laser chips, builds the modulators and photonic engines around them, and ships complete 800G/1.6T transceivers, with CPO subassembly and optical circuit switching (OCS) hardware behind that. In March 2026, NVIDIA ($NVDA) underwrote exactly this stack: a $2B strategic investment in Coherent (matched at Lumentum ($LITE)) with multi-billion purchase commitments to lock up laser capacity for the AI buildout — the laser layer stopped being a merchant market and became spoken-for capacity. The investment case is integrated-stack defensibility through the 1.6T era. Coherent doesn't depend on third-party EML supply or third-party InP substrates, captures margin at every layer, and can flex between selling chips (CW laser dies into external light sources and the CPO ecosystem) and selling finished modules. The co-packaged-optics transition cuts both ways — it threatens the DSP-pluggable module business over time, but every CPO port still needs qualified high-power InP lasers, and the 6-inch InP wafer transition gives $COHR a structural cost lever exactly when laser capacity is the constraint NVIDIA is paying to secure. The bear case: execution complexity across a sprawling portfolio (II-VI integration debt, leverage), customer concentration around $NVDA and a handful of hyperscalers, Chinese module competition (InnoLight, Eoptolink) compressing 800G/1.6T pricing, and the EML→CW mix shift if CPO ramps faster than pluggables grow. Pair with $LITE (closest peer), $AAOI (smaller pure-play), $FN (assembly), and $AXTI (substrates) for the full photonics basket.
**Bottleneck theme:** Photonics / CPO **Focus:** $COHR — COHERENT CORP. Coherent ($COHR) is the most vertically integrated photonics franchise in public markets — it grows its own InP substrates and epi, fabricates EML and CW laser chips, builds the modulators and photonic engines around them, and ships complete 800G/1.6T transceivers, with CPO subassembly and optical circuit switching (OCS) hardware behind that. In March 2026, NVIDIA ($NVDA) underwrote exactly this stack: a $2B strategic investment in Coherent (matched at Lumentum ($LITE)) with multi-billion purchase commitments to lock up laser capacity for the AI buildout — the laser layer stopped being a merchant market and became spoken-for capacity. The investment case is integrated-stack defensibility through the 1.6T era. Coherent doesn't depend on third-party EML supply or third-party InP substrates, captures margin at every layer, and can flex between selling chips (CW laser dies into external light sources and the CPO ecosystem) and selling finished modules. The co-packaged-optics transition cuts both ways — it threatens the DSP-pluggable module business over time, but every CPO port still needs qualified high-power InP lasers, and the 6-inch InP wafer transition gives $COHR a structural cost lever exactly when laser capacity is the constraint NVIDIA is paying to secure. The bear case: execution complexity across a sprawling portfolio (II-VI integration debt, leverage), customer concentration around $NVDA and a handful of hyperscalers, Chinese module competition (InnoLight, Eoptolink) compressing 800G/1.6T pricing, and the EML→CW mix shift if CPO ramps faster than pluggables grow. Pair with $LITE (closest peer), $AAOI (smaller pure-play), $FN (assembly), and $AXTI (substrates) for the full photonics basket.
The Coherent Stock ($COHR): The Vertically Integrated InP → EML → 1.6T Photonics Stack thesis on Macroplane focuses on COHERENT CORP. (COHR).
It covers InP & Substrates, Lasers & Light Sources, Optical Transceivers, Silicon Photonics, Advanced Packaging, Network Switches & Routers, Hyperscalers, EMLs.
Browse all AI supply-chain theses · Macro trends · Industries · Product categories · Baskets