Ciena Corporation (NASDAQ: CIEN) will announce results for its fiscal 2007 first quarter on Thursday, March 1, 2007, via Business Wire and First Call before the open of the financial markets. The press release also will be available on Ciena’s website at www.ciena.com.

In conjunction with the announcement, Ciena’s management will host a teleconference call beginning at 8:30 AM (Eastern) on March 1, 2007. Interested listeners may access the live web broadcast at www.ciena.com.

Rebroadcast Information

For those listeners unable to participate in the live web broadcast on Thursday, March 1, an archived version of the conference call will be available shortly following the conclusion of the live call in the Investor Relations/Events section of Ciena’s website at: www.ciena.com.

About Ciena

Ciena Corporation is the network specialist, focused on expanding the possibilities for its customers’ networks while reducing their cost of ownership. The company’s systems, software and services target and cure specific network pain points so that telcos, cable operators, governments and enterprises can best exploit the new applications that are driving their businesses forward. For more information, visit www.ciena.com.