Laser Focus: 2 Optical Stocks Lighting Up AI

Key Points

• AI data centers are shifting from copper cabling to optical transceivers because copper cannot handle high-speed signals over meaningful distances without heat and loss.
• Lumentum Holdings and Coherent Corp. are positioned as key suppliers of lasers and optical components benefiting from the 800G and 1.6T photonics upgrade cycle.
• Both companies reported strong quarterly earnings beats and hold Moderate Buy analyst ratings, though investors should weigh valuation, beta, and supply risks before entering.

Data centers running complex artificial intelligence models need immense bandwidth, but traditional copper cabling is hitting a wall. At high speeds, copper struggles to transmit signals beyond one to two meters without generating excess heat and signal loss.

To keep GPUs communicating without latency bottlenecks, companies are accelerating the transition from copper wires to optical connections. This upgrade underpins a multi-billion-dollar photonics cycle centered on 800-gigabit and 1.6-terabit optical transceivers.

For investors interested in the physical foundation of AI, this shift expands the opportunity set beyond semiconductor names to the specialized manufacturers building the lasers and optical transceivers that connect next-generation server clusters. Moving from copper to light alters the economics of data transmission across modern computing fabrics.

Burning Through Wire: How Laser Photons Beat Copper Heat

Direct-attach copper cables were the standard for short-distance server connections during earlier cloud expansions. However, as processing speeds advance toward 800G and 1.6T, copper faces severe physical limits.

When high-speed electrical signals travel through copper, they degrade rapidly over short distances. Overcoming this loss requires thicker wiring and supplemental electrical retimers, both of which draw more power and produce heat inside tightly packed hardware racks.

Optical transceivers solve much of this problem by transforming electrical data into light pulses using semiconductor lasers. These light signals can travel through fiber-optic strands for hundreds of meters with minimal signal loss and negligible heat generation at the cable layer.

This engineering shift is tightening supplies of specialized optical components. Indium phosphide lasers and electro-absorption modulated lasers require complex manufacturing facilities that can take years to build and qualify. As data center builders demand immediate transceiver shipments, suppliers that control their own laser production are gaining pricing power.

Lumentum Holdings Inc.: Beaming Up Pure Laser Leverage

As cloud providers rebuild their networks, Lumentum Holdings Inc. NASDAQ: LITE stands out as an upstream supplier of optical components. The company engineers and manufactures the underlying laser diodes, photonic integrated circuits, and optical subsystems required to move light between servers.

Lumentum recently saw its share price trade near $950, backed by trading volume of approximately 6.46 million shares. That turnover generated about $5.94 billion in transaction volume, reflecting focused institutional capital inflows.

During the quarterly earnings report on Aug. 11, 2026, Lumentum reported earnings per share (EPS) of $3.23, beating consensus expectations of $2.97. Quarterly revenue rose 109.3% year over year (YOY), pushing annual sales to about $3.01 billion.

Lumentum carries a trailing 12-month net loss of $6.94 billion, reflecting historical non-cash goodwill and asset impairment charges. The operating reality shows clear progress: projected earnings growth stands at 66.63%, and the forward price-to-earnings (P/E) ratio has moderated to around 46.

Lumentum also maintains conservative leverage, supported by a debt-to-equity ratio of 0.01 and a current ratio of 1.68. Wall Street maintains a Moderate Buy consensus rating across 22 covering analysts, with an average price target of $1,053.83 and an upper target of $1,400.

Coherent Corp.: Cooling AI Racks While Guiding the Light

Coherent Corp. NYSE: COHR brings broader vertical integration to the optical transition. Beyond optical transceivers and photonic components, Coherent maintains deep capabilities in engineered materials, lasers, and industrial subsystems. This scale gives Coherent direct access to hyperscale procurement departments seeking end-to-end transceiver integration.

Coherent's stock recently surpassed resistance at around $300 on daily volume of about 7.50 million shares.

In the company's quarterly earnings reported on Aug. 12, 2026, it delivered EPS of $1.74, topping the consensus estimate of $1.43 by 31 cents. Quarterly revenue climbed 33.8% YOY, bringing 12-month sales to roughly $7.12 billion.

Unlike early-stage optical plays, Coherent generated $805 million in trailing GAAP net income, supporting an 11.31% net profit margin.

From a valuation standpoint, Coherent trades at a trailing P/E of about 71, but forward P/E drops to 34, supported by a price/earnings-to-growth (PEG) ratio of 0.60.

The company also has exposure to another major AI infrastructure challenge: heat.  A $1 billion capital partnership with Denso and Mitsubishi Electric is supporting the commercialization of 300mm silicon carbide substrates, which can help improve heat management directly at the semiconductor package.

Wall Street holds a Moderate Buy consensus rating across 21 analysts, with an average price target of $397.63 and a high target of $500.

Strategic Entry Points for the Long-Haul Transition

Investing in a hardware transition requires balancing tailwinds against operating risks. Lumentum trades at a price-to-sales multiple of roughly 27, leaving little leeway for supply disruptions or fabrication yield issues.

Coherent carries a beta of about 2.10, exposing investors to larger price swings during broader market pullbacks. The stock's TradeSmith health indicator also briefly shifted into the Yellow Zone, reflecting short-term inventory absorption as manufacturing ramps up.

Investors looking to capitalize on the optical upgrade cycle may want to avoid chasing single-day price spikes. A balanced strategy involves monitoring hyperscaler capital expenditure budgets and using dollar-cost averaging to build exposure on market pullbacks, allowing long-term fundamentals to work as laser-based networking displaces copper across global data infrastructure.