CIENA CLASS ACTION SUIT DISMISSED WITHOUT LEAVE TO AMEND

Linthicum, MD — 06/15/2000

Ciena Corporation (CIEN) today announced that the plaintiffs in the consolidated securities class action lawsuit against the Company and certain of its officers and directors have agreed to waive their right to appeal the earlier decision of the United States District Court for the District of Maryland dismissing the lawsuit without leave to amend. In exchange, the Company agreed to not seek attorneys' or costs under the Private Securities Litigation Reform Act of 1995 or otherwise against the plaintiffs or their lawyers.

On May 15, 2000, the Maryland federal district court issued an order dismissing the consolidated securities class action complaint naming Ciena and certain of its officers and directors as defendants. The complaint, originally filed on August 26, 1998 and subsequently dismissed, amended and re-filed on August 20, 1999, alleged that Ciena and certain of its officers and directors violated certain provisions of the federal securities laws by making false statements, failing to disclose material information and taking other actions to artificially inflate and maintain the market price of Ciena's common stock during the class period of May 21, 1998 to September 14, 1998. Ciena's motion to dismiss the second amended complaint was granted and the action was dismissed by the order of the Honorable J. Frederick Motz, United States District Judge for the District of Maryland. This order was subject to the plaintiffs' right to appeal, which they now have waived.


About Ciena

Ciena Corporation's market-leading intelligent optical networking systems form the core for the new era of networks and services worldwide. Ciena's LightWorks™ architecture enables next-generation optical services and changes the fundamental economics of service-provider networks by simplifying the network and reducing the cost to operate it. Additional information about Ciena can be found at http://www.ciena.com.
Press Contacts:
Nicole Anderson
Ciena Corporation
(877) 857 -7377
pr@ciena.com
Investor Contacts:
Marie Downing
Ciena Corporation
(888) 243-6223
ir@ciena.com