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<P ALIGN="RIGHT">Exhibit 5.1</P>

<B><P ALIGN="CENTER">MORRISON &amp; FOERSTER LLP<BR>
Palo Alto, California</P>
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<P ALIGN="CENTER">May 2, 2000</P>

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<P>JDS Uniphase Corporation<BR>
163 Baypointe Parkway<BR>
San Jose, California 95134</P>

<P>Ladies and Gentlemen:</P>

<P>&#9;&#9;We have examined the Registration Statement on Form S-8 to be filed
by JDS Uniphase Corporation (the &quot;Company&quot;) with the Securities and
Exchange Commission (the &quot;SEC&quot;) in connection with the registration
under the Securities Act of 1933, as amended, of an aggregate of 181,190 shares
of the Company's Common Stock, $.001 par value (the &quot;Plan Shares&quot;)
which will be issuable under the Cronos Integrated Microsystems, Inc. 1999 Stock
Plan (the &quot;Plan&quot;).</P>

<P>&#9;&#9;As your counsel in connection with the Registration Statement, we
have examined the proceedings taken by you in connection with the assumption of
the Plan and the authorization of the issuance of the shares of Common Stock
under the Plan and such documents as we have deemed necessary to render this
opinion.</P>
<P>&#9;&#9;Based upon the foregoing, it is our opinion that the Plan Shares,
when issued and outstanding pursuant to the terms of the Plan, will be validly
issued, fully paid and nonassessable shares of the Company's Common Stock.</P>
<P>We consent to the use of this opinion as an exhibit to the Registration
Statement.  </P>

<P ALIGN="CENTER">Very truly yours,</P>

<I><P ALIGN="CENTER">&nbsp;/s/ Morrison  &amp; Foerster LLP</P>
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