Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (No. 333-27131, 333-30900, 333-72474, 333-91294, 333-102462, 333-103328, 333-113872, 333-115287, 333-121110, 333-123509, 333-123510, 333-149520, 333-149929, 333-163927 and 333-166125) and on Form S-3 (No. 333-108476 and 333-149519) of Ciena Corporation of our report dated December 22, 2010 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Baltimore, Maryland
December 22, 2010