Losses in U.S.-listed optical communications shares deepened on Aug. 18, with BIT(bit.com) data showing Roundhill Optical Module ETF (LYTE) down 8.27% and the Purely Photonics ETF (FOTO) off 10.07%. Among individual names, Optoelectronics (AAOI) fell 11.77%, Coherent (COHR) dropped 11.76%, Ciena Corporation (CIEN) lost 9.94%, Lumentum Holdings (LITE) declined 9.05%, Corning (GLW) slid 7.72%, and Marvell Technology (MRVL) was down 7.65%. The updated figures marked a sharp worsening from the earlier premarket losses across the optical communications sector.