Optical Module Stocks Are Surging. Here Is Why the Structural Case Is Real
Applied Optoelectronics (AAOI) is up 488% year-to-date. Lumentum (LITE) has gained 180%. Coherent (COHR) has more than doubled at 112%. The numbers look like a momentum trade. The underlying thesis is more durable than that.
Why AI Clusters Cannot Function Without Optical
Traditional copper interconnects cannot support the bandwidth requirements of large-scale GPU clusters. At 10,000-card scale, which is where Nvidia's Blackwell and Vera Rubin deployments are heading, copper becomes a physical bottleneck: too much heat, too high latency, insufficient bandwidth per watt. Optical transceivers replace copper in the data centre fabric, carrying data at the speed of light between GPU racks, switches, and servers.
Every additional GPU cluster deployed by a hyperscaler is, by definition, an additional optical transceiver order. The optical module is not optional infrastructure. It is a prerequisite.
The Market Numbers
TrendForce projects the global AI optical transceiver market to reach USD 26 billion in 2026, up from USD 16.5 billion in 2025, a 57% year-on-year expansion. Goldman Sachs raised its 2026 demand forecast for 800G modules to 33.5 million units, a 58% upward revision from its prior estimate. The 1.6T module tier, which is the next generation above 800G, is on track to ship approximately 7 million units in 2026.
Supply is not keeping pace. EML (Electro-absorption Modulated Laser) components, the key photonics element inside high-speed transceivers, are fully allocated. Major suppliers have no available capacity. A constrained supply curve against an accelerating demand trajectory is the basic setup for sustained pricing power.
The Key US-Listed Names and What Differentiates Them
Coherent (COHR): Vertically integrated with photonics materials and laser fabrication in-house. Data centre book-to-bill ratio above 4:1, meaning incoming orders are running four times faster than deliveries. Coherent is also co-developing CPO (Co-Packaged Optics) technology directly with Nvidia. CPO integrates the optical engine inside the switch package, eliminating the pluggable transceiver entirely. Coherent is positioning for both the current transceiver cycle and the post-transceiver CPO wave.
Lumentum (LITE): Leading supplier of indium phosphide (InP) photonic components used across 800G and 1.6T transceivers. Strong exposure to hyperscaler demand through component supply rather than finished module assembly.
Applied Optoelectronics (AAOI): Smaller, higher-beta name with concentrated exposure to data centre transceivers. The 488% YTD move reflects both genuine demand upside and a significant short squeeze component. Volatility is higher, and the May 7 session (AAOI -14%, COHR -10%, LITE -7%) illustrated how quickly sentiment can reverse.
Fabrinet (FN): Contract manufacturing play. As brands like Coherent and Lumentum outsource assembly, Fabrinet captures the production ramp. Lower headline risk, more stable margin structure.
The CPO Wildcard
Co-Packaged Optics represents the longer-term architectural shift. CPO ports are projected to exceed 4.5 million globally by 2026, compared with just 50,000 in 2023. The CPO market is forecast to reach USD 3.51 billion in 2026, up from USD 46 million in 2024. Companies that own both the pluggable transceiver supply chain and the CPO development track, like Coherent, are better positioned than pure-play pluggable module vendors for the multi-year transition.
Investment Angle
For Singapore-based investors tracking this theme, the structural demand case is intact. The question at current price levels is entry timing and position sizing, not thesis validity. AAOI at +488% carries a different risk profile than COHR at +112%. Investors who missed the initial move should distinguish between the structural winners with CPO optionality and the high-beta momentum names that have already priced in significant demand pull-forward.
The copyright of this article belongs to the original author/organization.
The views expressed herein are solely those of the author and do not reflect the stance of the platform. The content is intended for investment reference purposes only and shall not be considered as investment advice. Please contact us if you have any questions or suggestions regarding the content services provided by the platform.
