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                                                                    EXHIBIT 23.2


                       CONSENT OF DELOITTE & TOUCHE LLP


We consent to the use in this Pre-Effective Amendment No. 2 to Registration
Statement No. 333-53146 of CIENA Corporation on Form S-4 of our report dated
February 12, 2001 related to the financial statements of Cyras Systems, Inc.,
appearing in the Prospectus, which is part of this Registration Statement, and
to the references to us under the headings "Selected Historical Financial Data
of Cyras", "Change in Independent Auditors" and "Experts" in such Prospectus.

/s/ Deloitte & Touche LLP

San Jose, California

February 23, 2001