US optical communication concept stocks fell collectively in pre-market trading, with Marvell down over 2%

```htmlJinse Finance reported that on July 22, U.S. optical communication concept stocks collectively declined in pre-market trading. Among them, Astera Labs, Coherent, Credo Technology, Ciena, AXT Inc, and MaxLinear fell by more than 3%, while Fabrinet, Lumentum, Corning, Applied Optoelectronics, Tower Semiconductor, Marvell Technology, POET Technologies, and GlobalFoundries dropped by more than 2%.```