Nvidia Gets The Headlines. But This Optical Networking Stock Was The Bigger AI Surprise

Coherent’s stock surged more than 400% over the past 12 months as AI-driven data center upgrades boosted demand for its optical networking products. Fiscal 2025 revenue rose 23%, and analysts expect revenue to grow at a 30% CAGR through fiscal 2028 with EPS turning positive in fiscal 2026. The article remains constructive on Coherent’s long-term AI exposure, but flags valuation at 63x fiscal 2027 earnings as a potential cap on further upside versus Nvidia.

Analysis

The market is treating COHR less like a cyclical component supplier and more like a tollbooth on the AI bandwidth bottleneck. That re-rating is rational, but the next leg depends on whether optical demand stays ahead of hyperscaler capex discipline; if cloud providers pause spending even briefly, the stock can de-rate much faster than the earnings model implies because the multiple is now doing as much work as the fundamentals.

Second-order, the real winner is the broader optical ecosystem, not just COHR: transceiver vendors, laser tool makers, and fiber interconnect names should all see follow-through as 800G moves from pilot to production and 1.6T becomes a procurement conversation. The loser is copper-centric intra-rack architecture and any semiconductor exposure predicated on compute-only spending; AI buildouts are increasingly a network-throughput story, which means budget share shifts away from pure GPU demand toward connectivity and thermal management.

The contrarian risk is that consensus is extrapolating a multi-year upgrade cycle into a near-term straight line. In the next 1-2 quarters, margin and sentiment can wobble if qualification delays, inventory normalization, or customer digestion hits optical order flow; that matters because COHR’s valuation already discounts several years of high-teens to 30% growth. If revenue beats merely meet expectations, the stock can underperform despite still posting strong fundamentals.

Relative value still looks cleaner in NVDA than COHR on a forward earnings basis, which makes COHR vulnerable to a growth-stock-to-growth-stock compression trade if AI enthusiasm broadens but investors become more selective. The more interesting setup is that COHR may remain a strong long-term beneficiary while being a poor incremental buy after a 400% move; the setup favors using pullbacks rather than chasing strength, and pairing it against a lower-multiple AI leader if the market starts rewarding quality and cash flow over narrative.

Key Decisions for Investors

• Avoid initiating fresh outright longs in COHR at current levels; wait for a 10-15% pullback or a post-earnings reset before adding, because the stock is priced for execution perfection over the next 4-6 quarters.
• Pair trade: long NVDA / short COHR for 3-6 months to express a relative-value view that the GPU platform leader should outperform the optics beneficiary once valuation discipline returns; target 15-20% spread with tight stop if optical orders accelerate again.
• For higher-risk accounts, buy COHR downside protection via 3-6 month puts or put spreads into the next earnings window to hedge multiple compression risk while keeping upside participation.
• Overweight the broader AI network supply chain on dips, especially optical transceiver and interconnect names versus pure copper-legacy exposure; the trade works if hyperscaler capex stays intact and bandwidth intensity keeps rising.
• Use COHR as a momentum-sensitive trading vehicle, not a core fundamental compounder; trim into strength above key resistance and re-enter only on evidence that 1.6T demand is converting from commentary into bookings.