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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Kx4MI4IkbQtvL2BO9cbbE8G6wsM7PG275OSyIlyKZO7Sz4lXRzwWJTfQ6D5CIflK
 KQtjg8bFVLbAH1/WXsxQpQ==

<SEC-DOCUMENT>0001266066-08-000011.txt : 20080625
<SEC-HEADER>0001266066-08-000011.hdr.sgml : 20080625
<ACCEPTANCE-DATETIME>20080625160233
ACCESSION NUMBER:		0001266066-08-000011
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080624
FILED AS OF DATE:		20080625
DATE AS OF CHANGE:		20080625

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CIENA CORP
		CENTRAL INDEX KEY:			0000936395
		STANDARD INDUSTRIAL CLASSIFICATION:	TELEPHONE & TELEGRAPH APPARATUS [3661]
		IRS NUMBER:				232725311
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1031

	BUSINESS ADDRESS:	
		STREET 1:		1201 WINTERSON ROAD
		CITY:			LINTHICUM
		STATE:			MD
		ZIP:			21090
		BUSINESS PHONE:		4108658500

	MAIL ADDRESS:	
		STREET 1:		1201 WINTERSON ROAD
		CITY:			LINTHICUM
		STATE:			MD
		ZIP:			21090

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SMITH ARTHUR D
		CENTRAL INDEX KEY:			0001266066

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21969
		FILM NUMBER:		08916770

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		410-694-5700

	MAIL ADDRESS:	
		STREET 1:		1201 WINTERSON ROAD
		CITY:			LINTHICUM
		STATE:			MD
		ZIP:			21090
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-06-24</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000936395</issuerCik>
        <issuerName>CIENA CORP</issuerName>
        <issuerTradingSymbol>CIEN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001266066</rptOwnerCik>
            <rptOwnerName>SMITH ARTHUR D</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CIENA CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>1201 WINTERSON ROAD</rptOwnerStreet2>
            <rptOwnerCity>LINTHICUM,</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21090</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CHIEF OPERATING OFFICER</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-06-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>9000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>25.0849</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>94276</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Sales were effected pursuant to Rule 10b5-1 trading plan dated 3/19/07.</footnote>
        <footnote id="F2">Reflects the average sale price of the total shares sold.  Actual sale prices are as follows:  100 shares at $25.36; 100 shares at $25.35; 100 shares at $25.32; 100 shares at $25.31; 200 shares at $25.30; 300 shares at $25.29; 300 shares at $25.28; 900 shares at $25.27; 300 shares at $25.25; 300 shares at $25.23; 200 shares at $25.22; 100 shares at $25.20; 100 shares at $25.19; 300 shares at $25.18; 100 shares at $25.17; 100 shares at $25.16; 100 shares at $25.15; 200 shares at $25.14; 100 shares at $25.13; 400 shares at $25.12; 200 shares at $25.11; 100 shares at $25.10; 300 shares at $25.09; 300 shares at $25.08; 100 shares at $25.07; 100 shares at $25.06; 300 shares at $25.05; 100 shares at $25.02; 300 shares at $25.01; 300 shares at $25.00; 100 shares at $24.99; 100 shares at $24.98; 100 shares at $24.97; 200 shares at $24.93; 100 shares at $24.91; 200 shares at $24.89; 400 shares at $24.86; 100 shares at $24.85; 100 shares at $24.84; 300 shares at $24.81; 100 shares at $24.80; 
400</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: Erik Lichter  For: Arthur D. Smith</signatureName>
        <signatureDate>2008-06-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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