Woofun AI data shows that U.S. optical communication stocks experienced a synchronized decline at the market open. The Pure Photonic ETF (FOTO) fell by 5.7%. Marvell Technology (MRVL) dropped by 6.1%, while Applied Optoelectronics (AAOI) decreased by 7.1%. Lumentum Holdings (LITE) saw the steepest drop at 8.86%, with Coherent Corp. (COHR) down 8.4% and Ciena Corporation (CIEN) falling 4.75%.