The real bottleneck in AI data centers is not a single chip winner but the entire photonics chain that converts electrical signals to light and shuttles massive data. Brian's core thesis: as the industry transitions from 800G to 1.6T and eventually 3.2T, the first to capture outsized returns are not the hottest headline names but indispensable suppliers like Corning, Amphenol, and Ciena, along with upstream materials and testing.
“Copper is hitting a physical limit. Every data center will eventually migrate to optics. China has proven that this road can go much further,” Brian argues. Beyond about 3 feet, copper loses advantage with higher heat and power consumption, while optics solves both. The key is converting electricity to light.
Corning: Glass Layer Dominance
Corning's optical communications revenue grew 36% last quarter while segment profit surged 93%, demonstrating both pricing power and scaling benefits. It has become a designated core supplier for Meta, Amazon, Google, Microsoft, OpenAI, and Nvidia—no other competitor commands such a client list. Meta committed up to $6 billion, Amazon signed multi-billion dollar contracts, and two other hyperscalers signed similar agreements, locking in revenue years before fiber is even drawn. Global fiber demand grows 22-25% annually but supply expands at only half that pace, pushing lead times beyond 60 weeks.
Interconnect Layer: Amphenol and Credo
Amphenol acquired CommScope's fiber connectivity business for $10.5 billion, making AI data centers its core engine with organic growth over 80% last quarter. Record backlog of $9.4 billion. Operating margin expanded from 22% to 28% despite the large acquisition, with a PEG of just 0.7. Credo Technology bridges old and new worlds: it maximizes copper's life inside racks with low-power chips while extending into optical chips and cables. It has shipped to all top-five U.S. hyperscalers. Quarterly revenue surged from $135 million to $437 million in six quarters, gross margin 68%, but client concentration is extreme—three customers account for 88% of revenue, and the stock trades at 35x sales.
System Layer: Ciena's 'No-Dig' Expansion
Ciena leads Western coherent optics with its proprietary WaveLogic technology, compressing 1.6T data into a single wavelength to enable existing fiber to carry more without re-laying cables. The product has won 49 customers in just two quarters. Three of the top four hyperscalers have adopted it, and cloud clients now represent nearly half of revenue. Backlog grew by ~$2 billion in 90 days to nearly $7 billion, almost all scheduled for delivery next year. Revenue hit all-time highs with 40% YoY growth, operating margin doubled from below 8% to over 15%, but forward P/E is ~120x.
Upstream Bottleneck: AXT and 'Shovel Seller' VEO Solutions
AXT is one of the few companies globally that can produce indium phosphide wafers, the critical material for all optical lasers. Backlog exceeded $100 million, but virtually all manufacturing is in China, requiring export permits—a major risk. The company is still unprofitable with a price-to-sales ratio of ~66x. VEO Solutions is the 'shovel seller' of the photonics world: its testing tools are required for every fiber link, transceiver, and system before going live. Network testing business surged 54% as data centers rush to validate new gear, lifting quarterly revenue past $400 million. Operating margins returned to double digits. The company also has a high-margin second business producing anti-counterfeiting coatings for banknotes.
One-Click Exposure: Pure Photonics ETF FOTO
For investors who prefer not to pick individual stocks, a pure photonics-themed ETF exists: the Tuttle Capital Pure Play Photonics Fund (FOTO). It filters out diversified conglomerates and concentrates on 15 pure optical companies, with top 10 holdings accounting for nearly 90%, including Lumentum, Coherent, Fabrinet, IPG Photonics, and Inphi.
In summary, copper has hit its physical limit; all data centers must migrate to optics. China has shown the path can go further. Capital is flooding into the photonics chain, and investors need to focus on glass, connectors, systems, and upstream suppliers for a complete map. However, Brian cautions that many names have already rallied substantially, and the most favorable entry points will likely come on pullbacks.