Lumentum is shipping 30% below customer orders for photonics components essential to AI datacenter networks worldwide. The company's optical communications systems backlog has surged past $400 million, with most units scheduled for second-half delivery as hyperscalers from the US, Europe, and Asia race to build training infrastructure.
All EML production capacity is committed through end of 2027 under long-term supply agreements. Lumentum increased indium phosphide manufacturing capacity by over 20% in the December quarter, but the global demand-supply gap continues widening. The specialized fabrication process requires 18-24 months to scale, creating a worldwide constraint independent of regional manufacturing capacity.
EML chips convert electrical signals to optical light in AI datacenter transceivers, enabling high-speed data transfer between GPUs and servers. Microsoft, Google, Meta, and Asian cloud providers are building clusters requiring hundreds of thousands of optical transceivers per facility. Each next-generation AI training cluster needs 10-15x more optical interconnect bandwidth than previous server generations.
The photonics bottleneck compounds GPU supply constraints affecting AI infrastructure globally. Companies securing Nvidia H100 or B200 chips in the US, Europe, or Asia face delays networking them into functional training clusters without adequate optical components. The shortage creates a new global chokepoint in AI development.
Coherent Corp, II-VI, and other international photonics manufacturers report similar capacity constraints. The specialized nature of indium phosphide fabrication creates high barriers to new entrants worldwide, limiting near-term relief. Traditional silicon photonics offer lower performance for AI workloads requiring 800G and 1.6T transmission speeds now standard across major datacenters.
Some hyperscalers are pursuing captive photonics capabilities in the US and Asia, though developing competitive manufacturing takes years. The shortage will likely constrain global AI training capacity expansion through at least 2026. Datacenter operators worldwide report optical components now consume 15-20% of total infrastructure budgets, up from 8-10% two years ago, reshaping capital allocation across the industry.
Sources:
1 Yahoo Finance, "Coherent’s OFC 2026 AI Optics And Nvidia Deal Spark Valuation Debate" (March 20, 2026)
2 Globe Newswire, "Coherent Demonstrates InP Technology Innovation With a Broad Range of Products" (March 17, 2026)
3 Yahoo Finance, "Marvell Technology Inc. (MRVL) Unveils Advanced Switch for AI Data Center Scale-Up Infrastructure" (March 22, 2026)
4 Yahoo Finance, "Is It Too Late To Consider Lumentum Holdings (LITE) After An 83% Year To Date Surge?" (March 21, 2026)
5 Nasdaq, "The Nasdaq Is on the Verge of a Correction. 4 Things Investors Need To Remember" (March 23, 2026)