Ciena (CIEN) 10-K 2005 FY Annual report

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-27131, 333-76915, 333-83581, 333-30900, 333-53146, 333-72474, 333-91294, 333-102462, 333-103328, 333-104825, 333-113872, 333-115287, 333-12110, 333-123509 and 333-123510), and on Form S-3 (No. 333-53922, 333-55030 and 333-108476) of Ciena Corporation of our report dated January 12, 2006 relating to the financial statements, management’s assessment of the effectiveness of internal control over financial reporting and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

McLean, Virginia
January 12, 2006