<SUBMISSION>
<ACCESSION-NUMBER>0001140361-07-015234
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20070731
<FILING-DATE>20070802
<DATE-OF-FILING-DATE-CHANGE>20070802
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>JDS UNIPHASE CORP /CA/
<CIK>0000912093
<ASSIGNED-SIC>3674
<IRS-NUMBER>942579683
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>0630
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>430 NORTH MCCARTHY BOULEVARD
<CITY>MILPITAS
<STATE>CA
<ZIP>95035
<PHONE>4085465000
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>430 NORTH MCCARTHY BOULEVARD
<CITY>MILPITAS
<STATE>CA
<ZIP>95035
</MAIL-ADDRESS>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>KENNEDY KEVIN
<CIK>0001182379
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>000-22874
<FILM-NUMBER>071019936
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>JDS UNIPHASE CORP
<STREET2>1768 AUTOMATION PKWY
<CITY>SAN JOSE
<STATE>CA
<ZIP>95131
</BUSINESS-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-07-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000912093</issuerCik>
        <issuerName>JDS UNIPHASE CORP /CA/</issuerName>
        <issuerTradingSymbol>JDSU</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001182379</rptOwnerCik>
            <rptOwnerName>KENNEDY KEVIN</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O JDS UNIPHASE CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>430 N MCCARTHY BOULEVARD</rptOwnerStreet2>
            <rptOwnerCity>MILPITAS</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95035</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Pres. &amp;  Chief Exec. Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>46374</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The balance reflects 492 shares acquired under the JDS Uniphase Corporation 1998 Amended and Restated Employee Stock Purchase Plan on July 31, 2007.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Sheri Piazza, Sr. Stock Administrator, Attorney-in-fact</signatureName>
        <signatureDate>2007-08-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
