AI supply-chain thesis — mapping bottlenecks, focus companies, and supply-chain exposure for investors.
**Bottleneck theme:** Photonics / CPO
**Focus:** $COHR — COHERENT CORP.
Coherent is the most vertically integrated photonics franchise in the industry, owning the entire stack from InP and SiC substrate growth through EML lasers, modulators, and complete 1.6T/3.2T transceivers, plus emerging CPO subassembly and OCS hardware. Versus Lumentum, Coherent has a deeper materials franchise (II-VI legacy) and a broader applications footprint (lasers, industrial photonics, 3D sensing, telecom, datacenter), but is also more diversified, which dilutes the AI-pure-play story relative to peers like Lumentum or AAOI.
The investment case is the integrated-stack defensibility — Coherent doesn't depend on third-party EML supply, doesn't depend on third-party InP substrates, and can move investment up or down the stack as cycles dictate. The bear case is execution complexity (multiple businesses, post-merger integration overhang, complex capital allocation) and competitive intensity at every layer. Pair with $LITE (the closest peer), $AAOI (the smaller pure-play), $FN, $AXTI for a full photonics basket.
Electrolytes — Liquid or solid electrolytes enabling lithium-ion transport in EV batteries.
Optical Transceivers — Optical modules for data center and telecom interconnects
Silicon Photonics — Photonic integrated circuits fabricated on silicon and silicon-on-insulator substrates — modulators, photodetectors, waveguides, grating couplers — used mainly in optical transceivers for data-center and telecom interconnects, with growing roles in co-packaged optics, LiDAR, and biosensing.
