X0303 4 2010-09-20 0 0000936395 CIENA CORP CIEN 0001360607 Aquino Michael Gerald 1065 LILLIAN DRIVE ALPHARETTA GA 30004 0 1 0 0 SR VP. Global Field Operations Common Stock 2010-09-20 4 S 0 291 15.091 D 164475 D Common Stock 2010-09-20 4 S 0 3588 15.0911 D 160887 D Common Stock 2010-09-20 4 S 0 994 15.0912 D 159893 D Shares reported represent an amount sold to cover the tax liabilities of the reporting person pursuant to a 10b5-1 sales instruction related to a restricted stock unit (RSU) award agreement dated 12/18/2007. Acquisition of the RSU was previously reported in Table I of reporting person's Form 4 on 12/20/2007. Shares reported represent an amount sold to cover the tax liabilities of the reporting person pursuant to a 10b5-1 sales instruction related to a restricted stock unit (RSU) award agreement dated 12/16/2008. Acquisition of the RSU was previously reported in Table I of reporting person's Form 4 on 12/18/2008. Shares reported represent an amount sold to cover the tax liabilities of the reporting person pursuant to a 10b5-1 sales instruction related to a restricted stock unit (RSU) award agreement dated 12/16/2009. Acquisition of the RSU was previously reported in Table I of reporting person's Form 4 on 12/18/2009. Shares reported include unvested Restricted Stock Units (RSUs). By: Erik Lichter For: Michael G Aquino 2010-09-23