Sec Form 4 Filing - LEON JESUS @ CIENA CORP - 2004-05-18

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person LEON JESUS 2. Issuer Name and Ticker or Trading Symbol CIENA CORP [ CIEN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Sr.V.P., and Chief Dev Officer (Last) (First) (Middle) 1201 WINTERSON ROAD 3. Date of Earliest Transaction (MM/DD/YY) 05/18/2004 (Street) LINTHLCUM, MD21090 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Employee Stock Option (right to buy) $ 3.58 05/18/2004 A 25,000 05/18/2005( 1 ) 05/18/2014 Common Stock 25,000 $ 0 25,000 D Employee Stock Option (right to buy) $ 3.28 05/26/2004 A 75,000 0 5/26/2005( 2 ) 05/26/2014 Common Stock 75,000 $ 0 75,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other LEON JESUS 1201 WINTERSON ROAD LINTHLCUM, MD21090 Sr.V.P., and Chief Dev Officer Signatures /s/Jesus Leon/Anita Weiskerger per POA 06/04/2004 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The shares vest at a rate of 25% on the one year anniversary of the grant date and 2.084% for each full month after the one year anniversary. ( 2 )The shares vest at a rate of 50% on May 31, 2005 and 50% at the end of the first month following the quarter in which the Company achieves positive cash flow from operating activities as reported in the Company's regular financial statements.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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