**Exhibit      12.1**

**Certification      pursuant to Section 302 of the Sarbanes-Oxley Act of 2002**

| 1.   | I                have reviewed this annual report on Form 20-F of EXFO Electro-Optical                Engineering Inc. ("EXFO"); |
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| 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; |
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| 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 EXFO                as at,                and for, the periods presented in this                report; |
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| 4.   | EXFO'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 (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f))                for EXFO and have: |
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| 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 EXFO, including its consolidated                subsidiaries, is made known to us by others within those entities,                particularly during the period in which this report is being                prepared; |
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| b.   | Designed                such internal control over financial reporting, or caused such internal                control 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                purposes in accordance with generally accepted accounting                principles; |
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| c.   | Evaluated                the effectiveness of EXFO's disclosure controls and procedures and                presented in this report our conclusions about the effectiveness                of the                disclosure controls and procedures, as at the end of the period covered                by                this report based on such evaluation;                and |
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| d.   | Disclosed                in this report any change in EXFO's internal control over financial                reporting that occurred during the period covered by the annual report                that has materially affected, or is reasonably likely to materially                affect, EXFO's internal control over financial                reporting. |
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| 5.   | EXFO's                other certifying officer and I have disclosed, based on our most                recent                evaluation of internal control over financial reporting, to EXFO's                auditors and the audit committee of EXFO's board of                directors: |
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| 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 EXFO's ability to record, process,                summarize and report financial information;                and |
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| b.   | Any                fraud, whether or not material, that involves management or other                employees who have a significant role in the EXFO’s internal control over                financial reporting. |
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*Germain Lamonde*