Damnang
· Damnang’s Substack
· April 19, 2026 at 23:44
· ⏱ 11 min read
| Read on Substack ↗
Summary
The article maps the optical value chain across seven layers, arguing that investors need to understand each layer's risk and return profile rather than chasing keywords. It identifies supply bottlenecks in laser sources (especially EMLs and CW lasers for CPO) and SiPh foundry capacity, and notes an ongoing M&A war for PIC platform companies. The massive sector run-up (+200% to +1,700%) raises questions about cycle timing, but the author implies that companies holding bottleneck positions or strong vertical integration are structurally positioned to benefit from AI-driven optical buildout.
•Optical stocks have rallied +200% to +1,700% over the past 12 months as of April 2026.
•The author splits the value chain into seven layers: Materials, Active Photonic Devices, Electro-Optical Connectivity IC, PIC Platform & IP, Foundry & Process, Packaging/Module, and Test.
•EML laser supply at 200G/lane is tight, and CPO drives a new wave of demand for continuous-wave (CW) external laser sources.
•Japanese majors Sumitomo Electric and Mitsubishi Electric supply EMLs but are conglomerate business units, not pure plays.
•M&A war: Marvell bought Celestial AI, Credo bought DustPhotonics, Astera Labs bought aiXscale, and AMD bought Enosemi (all 2025–2026), with private chokepoints like Ayar Labs and Lightmatter still unacquired.
•Tower Semiconductor is the main SiPh foundry (Layer 5), with capacity becoming a bottleneck; TSMC offers a COUPE platform and SoIC packaging for CPO.
Article places POET in the Middle Integration (L4+L6) category with in-house PIC design and module manufacturing, describing vertical integration as a structural moat.
Article places POET in the Middle Integration (L4+L6) category with in-house PIC design and module manufacturing, describing vertical integration as a structural moat.
Risk: Still early-stage revenue; competition from larger integrated players like Coherent or Lumentum.
Article explicitly names Tower Semiconductor as the main SiPh foundry, with capacity tightening as demand surges — a structural bottleneck beneficiary.
Article explicitly names Tower Semiconductor as the main SiPh foundry, with capacity tightening as demand surges — a structural bottleneck beneficiary.
Risk: Cyclical foundry utilization; potential new entrants like Samsung or TSMC scaling SiPh capacity.
Article identifies Lumentum as an upstream-integrated archetype and notes tight EML supply and CPO-driven CW laser demand — both directly benefit Lumentum's laser portfolio.
Article identifies Lumentum as an upstream-integrated archetype and notes tight EML supply and CPO-driven CW laser demand — both directly benefit Lumentum's laser portfolio.
Risk: Customer concentration and competition from Japanese majors; sector cyclicality.
Article highlights Credo's acquisition of DustPhotonics and its downstream integration from L3 ICs to L4 PIC and L6 modules, positioning it to capture value as architecture evolves toward LPO/CPO.
Article highlights Credo's acquisition of DustPhotonics and its downstream integration from L3 ICs to L4 PIC and L6 modules, positioning it to capture value as architecture evolves toward LPO/CPO.
Risk: Integration risks of acquired PIC technology; competition from Marvell and others.
This newsletter, published April 19, 2026,
features Damnang
discussing POET, TSEM, LITE, CRDO.
4 trade ideas extracted by AI with direction and confidence scoring.