POWER OF ATTORNEY
KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes
and appoints each of Michael Ashby and Denis Quinlan, signing singly, with
full power of substitution, as the undersigneds true and lawful
attorney-in-fact to:

(1) prepare, execute in the undersigneds name and on the
undersigneds behalf, and submit to the U.S. Securities and Exchange
Commission (the SEC) a Form ID, including amendments thereto, and any
other documents necessary or appropriate to obtain codes and passwords
enabling the undersigned to make electronic filings with the SEC of
reports required by Section 16(a) of the Securities Exchange Act of
1934 or any rule or regulation of the SEC;

(2) execute for and on behalf of the undersigned, in the
undersigneds capacity as an officer and/or director of Calix, Inc.
(the Company) and/or 10% holder of the Companys capital stock,
Forms 3, 4, and 5 and any amendments thereto in accordance with
Section 16(a) of the Securities Exchange Act of 1934 and the rules
thereunder;

(3) do and perform any and all acts for and on behalf of
the undersigned which may be necessary or desirable to complete and
execute any such Form 3, 4, or 5, complete and execute any amendment
or amendments thereto, and timely file such form with the SEC and
any stock exchange or similar authority; and

(4) take any other action of any type whatsoever in
connection with the foregoing which, in the opinion of such
attorney-in-fact, may be of benefit to, in the best interest of,
or legally required by, the undersigned, it being understood that
the documents executed by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form
and shall contain such terms and conditions as such attorney-in-fact
may approve in such attorney-in-facts discretion.

The undersigned hereby grants to each such attorney-in-fact full
power and authority to do and perform any and every act and thing
whatsoever requisite, necessary, or proper to be done in the exercise
of any of the rights and powers herein granted, as fully to all intents
and purposes as the undersigned might or could do if personally present,
with full power of substitution or revocation, hereby ratifying and
confirming all that such attorney-in-fact, or such attorney-in-facts
substitute or substitutes, shall lawfully do or cause to be done by
virtue of this power of attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the Company assuming, any of
the undersigneds responsibilities to comply with Section 16 of the
Securities Exchange Act of 1934.

This Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 4, and 5 with
respect to the undersigneds holdings of and transactions in securities
issued by the Company, unless earlier revoked by the undersigned in a
signed writing delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 25th day of September 2012.

Signature: /s/ Kevin DeNuccio
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Kevin DeNuccio








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