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 February 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 (Commission File No.) (IRS Employer Identification No.) jurisdiction of incorporation) 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 February 19, 2004, CIENA Corporation issued a press release announcing its intent to acquire Catena Networks, Inc. The press release is being furnished hereto as Exhibit 99.1. Item 7. Financial Statements and Exhibits. 99.1 Press Release dated February 19, 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: February 19, 2004 By: /s/ Russell B. Stevenson Jr. ------------------------------ Russell B. Stevenson, Jr. Senior Vice President, General Counsel and Secretary 3