The true bottleneck in AI data centers is not a single chip winner but the entire photonics supply chain that converts electrical signals to optical signals and moves massive data. Brian, a former Target and Amazon executive turned investor, core thesis: as the industry upgrades from 800G to 1.6T and ultimately 3.2T, the first to capture excess returns will not be the flashiest star companies but the suppliers that all giants must rely on — Corning, Amphenol, Ciena — as well as upstream materials and test equipment.
Copper is hitting physical limits. Beyond about 3 feet, copper quickly loses advantage with higher heat and power consumption; photonics solves all these at once. China has proven the fiber transmission ceiling can be shattered further: engineers achieved 5x the data capacity of existing levels on a single strand of glass fiber, without new trenching.
Glass & Fiber: Corning's Pricing Power and Scale
Corning, 175 years old, holds ~20% of global fiber market. Its latest fiber packs double the fiber count in the same space, and its bend-insensitive glass is hard to replicate. It is a designated core supplier to Meta, Amazon, Google, Microsoft, OpenAI, and Nvidia. Meta committed up to $6 billion, Amazon signed multi-billion contracts, with revenue locked in years before fiber is even drawn. Last quarter, optical communications revenue grew 36% but profit surged 93% — pricing power and scale effects in action. Company-wide operating margins rose from ~8% two years ago to over 16%, targeting 20% by year-end. However, PEG near 3 and P/S ~9x means it's not cheap.
Interconnect Layer: Amphenol and Credo
Amphenol, a quiet giant in high-speed connectors and cables, bought CommScope's fiber business for $10.5B in January, becoming a key photonics player. AI data centers are now its largest segment, with organic growth >80% last quarter, record backlog of $9.4B. Operating margins expanded from 22% to nearly 28%, PEG only ~0.7, P/S ~7x — broad coverage, lower volatility, fair valuation.
Credo Technology bridges old and new worlds: it extends copper's life with low-power chips while migrating to optics. Its 1.6T end-to-end products ship to all top five US hyperscalers. Quarterly revenue surged from $135M to $437M in six quarters (3x+), gross margin ~68%, operating margin ~37%. Risk: three customers account for 88% of revenue; insiders are selling. P/S ~35x, PEG ~1, best considered on deep pullbacks.
Systems, Upstream Bottlenecks: Ciena, AXT, and VEO
Ciena leads Western coherent optics; its WaveLogic squeezes 1.6T into a single wavelength — a capacity boost without digging. Two quarters after launch, it has 49 customers. Backlog grew ~$2B in 90 days to ~$7B, nearly all deliverable next year. Revenue up 40% YoY, operating margins doubled from <8% to >15%, but forward P/E ~120x, pricing in perfection.
AXT is one of the few global producers of indium phosphide wafers — the critical material for all optical lasers. Backlog hit a record >$100M, but all manufacturing is in China, facing export license risks. The company is not yet profitable, gross margin improved from 17% to ~30%, but P/S ~66x — a high-volatility small position. VEO Solutions is the "pick-and-shovel" seller: every fiber link, transceiver, and system must be tested. Its network test business surged >54% due to AI infrastructure buildout, quarterly revenue above $400M. It also produces anti-counterfeit coatings for banknotes, adding stable high-margin revenue. PEG ~1.4, insiders selling, wait for pullback.
One-Click Allocation: FOTO Pure Photonics ETF
For those not picking individual stocks, the Tuttle Capital Pure Play Photonics Fund (FOTO) focuses solely on photonics-heavy companies, excluding diversified conglomerates. Top holdings include Lumentum, Coherent, Fabrinet, etc., with only 15 names. Fees are moderate; it's best for watchlist consideration.
Copper's physical limit is here; every data center must switch to photonics. China has shown the path can go further. The biggest wealth often flows first to the companies that all participants must depend on — exactly the key suppliers at each layer of the complete photonics value chain.