(P1: THEME) Optical networking stocks continued their blistering 2026 rally Wednesday, fueled by accelerating AI data-center spending that has created a critical bottleneck in high-speed connectivity. Coherent (COHR) jumped 4.5%, while rivals Lumentum Holdings (LITE) and Applied Optoelectronics (AAOI) rose 4.1% and 6.1%, respectively, as investors bet on surging demand for the components that link thousands of AI processors together.
(P2: AUTHORITY) "Given 20-30% share in the global transceiver market, we think COHR is best positioned to benefit from higher volumes in 800G/1.6T transceivers," Bank of America securities analyst Vivek Arya said in a research note. "We maintain our Neutral rating, however, as the current valuation already seems to price in significant earnings power ahead."
(P3: DETAILS) The gains build on a historic year for the sector. Applied Optoelectronics, the group's leader, has surged 440% year-to-date. Coherent has climbed 112% and Lumentum has gained 180% over the same period, according to data from 24/7 Wall St. The demand is driven by hyperscalers building vast AI-centric data centers, where the 800G and incoming 1.6T optical transceivers are essential for connecting large clusters of GPUs from companies like Nvidia (NVDA). Coherent recently reported its Datacenter & Communications segment now represents 75% of its total revenue.
(P4: NUT GRAF) The rally underscores a structural shift where optical connectivity has become a primary chokepoint for AI scaling, a market BofA forecasts could reach $1.7 trillion by 2030. For investors, the question is how much of this growth is already priced in. While BofA remains neutral on Coherent, it boosted its price target to $400 from $365. Other analysts have been more bullish, with Jefferies setting a $1,200 target on Lumentum, signaling significant potential upside if the AI infrastructure arms race continues at its current pace.
As AI models grow, the need to connect thousands of GPUs in a data center exceeds the physical limitations of traditional copper wiring, forcing a shift to higher-bandwidth optical interconnects. This has turned a once-niche sector into a core part of the AI investment thesis. Recent deals, like Nvidia's reported $2 billion investment partnership with Coherent and a separate $500 million arrangement with Corning (GLW), confirm the strategic importance of securing the optical supply chain.
Coherent has benefited directly, with CEO Jim Anderson's inclusion in President Trump’s recent trip to China seen as a positive signal for market access. The company also recently shipped its first transceivers from a new 6-inch fab, a move Needham analysts noted should improve gross margins.
Investors are increasingly treating the optics group as a single thematic basket tied to AI capital spending. The correlation is tight; a sharp selloff last Thursday saw double-digit drops across the board, only to be erased by a massive rebound the following Monday.
The performance has been staggering. Over the past year, Lumentum stock is up 1,283% and Applied Optoelectronics has gained 910%. Applied Optoelectronics recently reported its datacenter revenue more than doubled year-over-year to $81.4 million, and confirmed its first volume shipments of 800G products to a large hyperscale customer. This intense momentum, however, also presents risks. Customer concentration with a handful of hyperscalers remains a key vulnerability, and any pause in their colossal AI spending would ripple through the entire sector.
This article is for informational purposes only and does not constitute investment advice.
