Power of Attorney for Marc D. Graff

Marc D. Graff, Senior Vice President & Chief Financial Officer of Ciena Corporation, has executed a Power of Attorney. This document appoints Sheela Kosaraju, Erik J. Lichter, and Michelle Rankin as his attorneys-in-fact. They are authorized to prepare and execute Form ID, Forms 3, 4, and 5, and any amendments thereto in accordance with Section 16(a) of the Securities Exchange Act of 1934. Additionally, they are empowered to perform any necessary acts to complete and file these forms with the SEC, the New York Stock Exchange, and other authorities. The Power of Attorney remains in effect until a signed revocation is delivered to the attorneys-in-fact.