Commentary: Why Marvell's rumored Lumentum buy may be hard to pull off but harder to pass up

The AI interconnect bottleneck is fundamentally re-pricing optical communications. If Marvell closes on Lumentum, it fuses optical DSP with InP laser silicon onto a single balance sheet—a structural kill-shot against Broadcom's 'silicon photonics plus external light source' architecture. Once the EML-to-PAM4-DSP loop is internalized, CPO yield becomes an engineering problem rather than a supply-chain dependency, and upstream epitaxial wafer suppliers lose pricing leverage. On compliance, CFIUS is procedural; the real antitrust exposure is a merged entity controlling both electrical and optical sides of data-center interconnect simultaneously, structurally disintermediating midstream module makers. Expect Broadcom to accelerate its in-house EML roadmap within two quarters. InP laser fabs in Taiwan, China and mainland China will likely pull forward capex to hedge supply concentration. The 18-month tail effect: lasers re-price from commodity component to strategic scarce input. Profit pools in optical interconnect migrate irreversibly toward whoever owns wafer-level laser capability. This is not a product deal—it is a re-drawing of the value chain.