On August 12, Lumentum witnessed a remarkable surge of over 8% in pre-market trading, emerging as the frontrunner in the optical communication sector. For the fourth fiscal quarter, the company reported adjusted earnings per share of $3.23, surpassing analysts' estimates. Meanwhile, its revenue soared by an impressive 109% on a year-on-year basis. Looking ahead, Lumentum anticipates net revenue ranging from $1.23 billion to $1.28 billion for the first quarter of fiscal year 2027, exceeding market expectations. Buoyed by Lumentum's stellar performance, the optical communication sector in the U.S. stock market experienced a collective upswing. Coherent's stock price climbed over 5%, while Marvell Technology, Ciena, and Credo all saw increases exceeding 3%. Corning, too, experienced a near 3% rise.