[Pre-market U.S. optical communication concept stocks continue to decline, MRVL down 2.85%] BlockBeats reports on July 28, according to BIT ((bit.com)) market data, pre-market U.S. optical communication concept stocks continued their downward trend, including: Marvell Technology (MRVL) down 2.85%; AAOI (Applied Optoelectronics) down 3.11%; LITE (Lumentum Holdings) down 2.24%; COHR (Coherent Corp) down 3.31%; CIEN (Ciena Corporation) down 2.7%.