SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K
                                 CURRENT REPORT
                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934



                                 August 19, 2004
                Date of Report (Date of earliest event reported)



                                CIENA Corporation
             (Exact name of registrant as specified in its charter)


          Delaware                    0-21969                  23-2725311
(State or other jurisdiction   (Commission File No.)         (IRS Employer
     of incorporation)                                     Identification No.)


                 1201 Winterson Road, Linthicum, Maryland 21090
               (Address of principal executive offices) (Zip Code)



               Registrant's telephone number, including area code:
                                 (410) 865-8500



                                 Not applicable
          (Former name or former address, if changed since last report)


                             Exhibit Index on Page 2






The information in this Report, including the exhibit, is furnished under Item
12 of Form 8-K and, pursuant to General Instruction B.6. thereunder, is not
"filed" for the purposes of Section 18 of the Securities Exchange Act of 1934.
Furthermore, the information in this Report, including the exhibit, is not
incorporated by reference into the filings of the registrant under the
Securities Act of 1933.

ITEM 12 -- RESULTS OF OPERATIONS AND FINANCIAL CONDITION

On August 19, 2004, CIENA Corporation issued a press release announcing its
financial results for the fiscal quarter ended July 31, 2004. The text of the
press release is furnished as Exhibit 99.1 to this Report.


                                  EXHIBIT INDEX

Exhibit Number    Description of Document
--------------    -----------------------
Exhibit 99.1      Text of Press Release dated August 19, 2004, issued by CIENA
                  Corporation, reporting its results of operations for the
                  third quarter of fiscal 2004.



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                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by  the
undersigned thereunto duly authorized.




                                 CIENA CORPORATION

Dated: August 19, 2004           By: /s/ Russell B. Stevenson, Jr.
                                 ----------------------------------------------
                                         Senior Vice President, General Counsel
                                         and Secretary





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