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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. _______________)*

CIENA CORPORATION

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

171779101

(CUSIP Number)

12-13-02

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

x Rule 13d-1 (b)

o Rule 13d-1 (c)

o Rule 13d-1 (d)

*The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Schedule 13G
CUSIP No. 171779101
	1.	Names of Reporting Person: OAK ASSOCIATES, Ltd.			I.R.S. Identification Nos. of above persons (entities only): 34-1818085
	2.	Check the Appropriate Box if a Member of a Group (See Instructions):
		(a)	x
		(b)	o
	3.	SEC Use Only:
	4.	Citizenship or Place of Organization: UNITED STATE
Number of Shares Beneficially Owned by Each Reporting Person With
			5.	Sole Voting Power: 379,792
			6.	Shared Voting Power: 0
			7.	Sole Dispositive Power: 0
			8.	Shared Dispositive Power: 379,792
	9.	Aggregate Amount Beneficially Owned by Each Reporting Person: 379,792
	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions): o
	11.	Percent of Class Represented by Amount in Row (9): 0.09%
	12.	Type of Reporting Person (See Instructions): 1A

Schedule 13G

		of 1940 (15 U.S.C 80a-8).
(e)	o	An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);
(f)	o	An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);
(g)	o	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	o	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	o	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	o	Group, in accordance with §240.13d-1(b)(1)(ii)(J).

Item 4.	Ownership.
Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.
	(a)	Amount beneficially owned:
	(b)	Percent of class:
	(c)	Number of shares as to which the person has:
		(i)	Sole power to vote or to direct the vote:
		(ii)	Shared power to vote or to direct the vote:
		(iii)	Sole power to dispose or to direct the disposition of:
		(iv)	Shared power to dispose or to direct the disposition of:
Instruction. For computations regarding securities which represent a right to acquire an underlying security see §240.13d3(d)(1).
Item 5.	Ownership of Five Percent or Less of a Class.
If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following x.
Instruction: Dissolution of a group requires a response to this item.
Item 6.	Ownership of More than Five Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the recipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than five percent of the

Schedule 13G

or effect.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date:	2-11-03
By:	/s/ Sandra H. Noll
Name:	SANDRA H. NOLL
Title:	COMPLIANCE OFFICER

The original statement shall be signed by each person on whose behalf the statement is filed or his authorized representative. If the statement is signed on behalf of a person by his authorized representative other than an executive officer or general partner of the filing person, evidence of the representative's authority to sign on behalf of such person shall be filed with the statement, provided, however, that a power of attorney for this purpose which is already on file with the Commission may be incorporated by reference. The name and any title of each person who signs the statement shall be typed or printed beneath his signature.

NOTE: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties for whom copies are to be sent.

Attention: International misstatements or omissions of fact constitute Federal criminal violations

      (See 18 U.S.C. 1001)

http://www.sec.gov/divisions/corpfin/forms/13g.htm
Last update: 11/05/2002