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



                                 April 20, 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)














Item 5.           Other Events and Regulation FD Disclosure.
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On April 20, 2004, CIENA Corporation issued a press release announcing the
closing of its San Jose, California facility on September 30, 2004. The press
release is being furnished hereto as Exhibit 99.1.

Item 7.           Financial Statements and Exhibits.
-------           ----------------------------------

99.1              Press Release dated April 20, 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


Date:  April 20, 2004        By:     /s/ Joseph R. Chinnici
                                   ---------------------------------------------
                                   Joseph R. Chinnici
                                   Senior Vice President and Chief Financial
                                   Officer




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