EXHIBIT 32.1
CIENA CORPORATION
Written Statement of Chief Executive Officer
Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
The undersigned, the Chief Executive Officer of Ciena Corporation (the “Company”), hereby
certifies that, to his knowledge, on the date hereof:
(a) the Report on Form 10-K of
the Company for the year ended
October 31, 2008 filed on the
date hereof with the Securities and Exchange Commission (the
“Report”) fully complies with
the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
(b) information contained in the Report fairly presents, in all material respects, the
financial condition and results of operations of
the Company.
A signed original of this written statement required by Section 906, or other document
authenticating, acknowledging, or otherwise adopting the signature that appears in typed form
within the electronic version of this written statement required by Section 906, has been provided
to Ciena Corporation and will be retained by Ciena Corporation and furnished to the Securities and
Exchange Commission or its staff upon request.
