AI supply-chain thesis — mapping bottlenecks, focus companies, and supply-chain exposure for investors.
**Bottleneck theme:** Photonics / CPO
**Focus:** $SIVE.ST — Sivers Semiconductors AB (publ)
Sivers is one of a handful of independent CW (continuous-wave) laser suppliers outside the duopoly of Coherent and Lumentum, positioned as the overflow chokepoint as 800G/1.6T transceiver demand and CPO (co-packaged optics) ramps outpace incumbent capacity. The customer roster — AMD, Meta, Ayar Labs, POET Technologies, Lightmatter — reads like a who's-who of the next photonics generation. As CPO architectures replace pluggable optics inside hyperscaler switches and AI accelerators, the laser source moves on-chip-package, and qualified InP-based CW laser sources become a binding supply.
Sivers' Swedish/EU base is also a strategic asset: hyperscalers and AI-accelerator vendors increasingly want a non-Asia, non-China supplier as part of their qualified vendor list. The investment case is two-fold — short-term overflow demand at 800G/1.6T as Coherent and Lumentum capacity tightens, and long-term socket placement on CPO designs as they qualify into volume in 2026-2027. Risks are typical of small-cap photonics: capital runway, customer concentration in unproven programs, and incumbent (COHR/LITE) capacity expansion eating into the overflow opportunity.
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.
Optical Transceivers — Optical modules for data center and telecom interconnects
