Exhibit 31.2

CERTIFICATION PURSUANT TO

RULE 13a-14(a) and 15d-14(a) UNDER THE
SECURITIES EXCHANGE ACT OF 1934,

AS AMENDED

I, Jeffrey Parsons, certify that:

1. I have reviewed this annual report on
Form 10-K of GigOptix, Inc.

2. Based on my knowledge, this report does not contain any untrue statement of a
material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all
material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report.

4. The registrants other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and
15d-15(e)) and internal control over financial reporting for the registrant and have:

a)Designed
such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant is made known to us by others within those entities,
particularly during the period in which this report is being prepared;

b)Designed such internal
control over financial reporting, or caused such internal controls over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial
statements for external purposed in accordance with generally accepted accounting principles.

c)Evaluated the effectiveness of the registrants disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this
report based on such evaluation; and

d) Disclosed in this report any change in the
registrants internal control over financial reporting that occurred during the registrants most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrants internal control over
financial reporting; and

5. The registrants other certifying officer and I have disclosed, based on our most
recent evaluation of internal control over financial reporting, to the registrants auditors and the audit committee of registrants board of directors:

a)All significant deficiencies and material weaknesses in the design or operation of internal control over
financial reporting which are reasonably likely to adversely affect the registrants ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in
the registrants internal control over financial reporting.



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|Date: March 2, 2011                                                                    
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|/s/    Jeffrey Parsons                                                                 
|Jeffrey Parsons                                                                        
|Acting Chief Financial Officer and Principal Financial and Principal Accounting Officer