2026 Q1 Optical Communications Sector Preview: An Earnings Outlook for Coherent, Lumentum, and Amphenol

Since the beginning of this year, the optical communication and connectivity sector has been one of the best-performing segments in the tech industry. Among the relevant companies, $Corning (GLW.US)$, a leader in optical fiber, has already reported earnings, while $Amphenol (APH.US)$ , a key player in copper connectivity, is set to announce its results before the market opens on April 29. Meanwhile, optical communication giants $Coherent (COHR.US)$ and $Lumentum (LITE.US)$ will release their earnings in early May. Other companies scheduled to report include $Fabrinet (FN.US)$ , $Arista Networks (ANET.US)$ , $Microchip Technology (MCHP.US)$ , and $Applied Optoelectronics (AAOI.US)$.

Several of these companies have seen their stock prices double year-to-date. Companies with the largest projected revenue growth include Lumentum, Applied Optoelectronics, and Credo Technology.

Optical Components: LITE vs. COHR

$Coherent (COHR.US)$ covers the entire value chain, from InP wafers and optical chips to high-speed optical modules. Compared to Lumentum, Coherent's business also includes industrial lasers and materials used in traditional manufacturing sectors.

$Lumentum (LITE.US)$, on the other hand, is almost entirely focused on EML/VCSEL light sources, making it far more directly driven by data center demand. AAOI shows relatively solid growth momentum, but its profitability has yet to turn positive.

Optical Component Contract Manufacturing

In the optical communication space, contract manufacturing of optical components carries relatively lower margins. The representative company, $Fabrinet (FN.US)$ , reported a gross margin of only 12.15% last quarter. The company does not develop its own chips and operates as a pure manufacturing and packaging entity.

Optical Fiber Materials

On the optical fiber materials front, $Corning (GLW.US)$ reported its earnings on April 28. Q1 revenue grew 18.1% year-over-year to $4.35 billion, with the optical communications division surging 36% driven by AI infrastructure demand. However, dragged down by weak consumer electronics and a $30 million one-time cost from its solar facility, the guidance for Q2 revenue and EPS came in slightly below expectations. Since the stock had already rallied over 90% since the start of the year, the positive news was already priced in, leading to a drop of over 8%. This divergence in earnings confirms a structural pattern in tech hardware demand: strong AI, weak consumer electronics. Highly valued stocks are particularly sensitive to any flaws in guidance. Investors should focus on the core AI computing supply chain while being cautious of valuation pullbacks under high earnings expectations.

Copper Connectivity Sector

Copper connectivity is one of the fastest-growing segments within the AI sector. For short-distance connections ranging from 0.5m to 3m, copper cables hold an absolute advantage. $Amphenol (APH.US)$ 's fastest-growing business is its Communications Solutions division, which now accounts for over 50% of total revenue, reflecting the enormous opportunities brought by data center demand.

Switches

The switch sector primarily serves the Scale-Out and Scale-Across markets, used for data center interconnection. $Arista Networks (ANET.US)$ has relatively lower growth within this segment. On one hand, its large revenue base means AI business accounts for a comparatively smaller share. Additionally, it faces competitive pressure from companies like NVIDIA entering adjacent markets. The company is also relatively dependent on $Broadcom (AVGO.US)$ 's high-end switching chips in its supply chain. Nevertheless, benefiting from the incremental AI market, its growth trajectory is also gradually trending upward.

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