UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q/A

(Amendment No. 1)

For the quarterly period ended December 29, 2012

OR

For the transition period from                      to                     

Commission file number 000-30684

OCLARO, INC.

(Exact name of registrant as specified in its charter)

2560 Junction Avenue, San Jose, California 95134

(Address of principal executive offices, zip code)

(408) 383-1400

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days:    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer”, “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act):    Yes  ¨    No  x

91,816,729 shares of common stock outstanding as of February 1, 2013

EXPLANATORY NOTE

Oclaro, Inc. (the “Company”) is filing this Amendment No. 1 to Form 10-Q (this “Amendment”) to amend its Quarterly Report on Form 10-Q for the quarterly period ended December 29, 2012 (the “Form 10-Q”), originally filed with the Securities and Exchange Commission (the “Commission”) on February 7, 2013. The purpose of this Amendment is to file Exhibit 4.1, which was inadvertently omitted from the original filing of the Form 10-Q.

This Amendment contains only the Cover Page to this Form 10-Q/A, this Explanatory Note, Item 6, the Signature Page and Exhibits 4.1, 31.1 and 31.2. No other changes have been made to the Form 10-Q. This Amendment speaks as of the original filing date of the Form 10-Q, does not reflect events that may have occurred subsequent to the original filing date, and does not modify or update in any way disclosures made in the original Form 10-Q.

The exhibits filed as part of this Quarterly Report on Form 10-Q, or incorporated by reference, are listed on the Exhibit Index immediately preceding such exhibits, which Exhibit Index is incorporated herein by reference.

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SIGNATURE

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

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EXHIBIT INDEX