On Monday, optical communication concept stocks declined broadly.

Credo Technology (CRDO.US) dropped more than 9%, Applied Optoelectronics (AAOI.US) fell 7%, and Coherent (COHR.US) slipped nearly 6%.

POET Technologies (POET.US) declined over 5%, while Marvell Technology (MRVL.US) and Lumentum (LITE.US) each dropped 5%.

Corning (GLW.US) fell more than 4%, and Nokia (NOK.US) was down over 3%.