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 May 3, 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. On May 3, 2004, CIENA Corporation issued a press release announcing the completion of its acquisitions of Catena Networks, Inc. and Internet Photonics, Inc. The press release is being furnished hereto as Exhibit 99.1. Item 7. Financial Statements and Exhibits. 99.1 Press Release dated May 3, 2004. -2- 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: May 3, 2004 By: /s/ Russell B. Stevenson, Jr. Russell B. Stevenson, Jr. Senior Vice President, General Counsel and Secretary -3-