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Lumentum and Coherent were among the biggest gainers in the S&P 500 as investors looked further down the AI data-center supply chain for signs of continued demand amid concerns about a potential slowdown in AI-related capital spending. The rally reflects a broader market search for exposure to AI infrastructure buildout beyond the largest chipmakers. Ciena joined the optical-sector rally after issuing a three-year outlook calling for roughly 30% revenue growth, sending its shares sharply higher. The forecast reinforced investor optimism that demand for optical networking equipment tied to AI data centers remains robust, adding another data point to the broader theme of optical component makers benefiting from the AI buildout.