SCHEDULE 13G Amendment No. 4 EXFO Electro-Optical Engineering Incorporated Subordinate Voting Common Stock Cusip #302043104 Cusip #302043104 Item 1: Reporting Person - FMR Corp. Item 4: Delaware Item 5: 68,100 Item 6: 0 Item 7: 4,583,100 Item 8: 0 Item 9: 4,583,100 Item 11: 15.000% Item 12: HC Cusip #302043104 Item 1: Reporting Person - Edward C. Johnson 3d Item 4: United States of America Item 5: 0 Item 6: 0 Item 7: 4,583,100 Item 8: 0 Item 9: 4,583,100 Item 11: 15.000% Item 12: IN Cusip #302043104 Item 1: Reporting Person - Abigail P. Johnson Item 4: United States of America Item 5: 0 Item 6: 0 Item 7: 4,583,100 Item 8: 0 Item 9: 4,583,100 Item 11: 15.000% Item 12: IN SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) Item 1(a). Name of Issuer: EXFO Electro-Optical Engineering Incorporated Item 1(b). Name of Issuer's Principal Executive Offices: 465 Godin Avenue Vanier, Quebec, Canada G1M 2K2 Item 2(a). Name of Person Filing: FMR Corp. Item 2(b). Address or Principal Business Office or, if None, Residence: 82 Devonshire Street, Boston, Massachusetts 02109 Item 2(c). Citizenship: Not applicable Item 2(d). Title of Class of Securities: Subordinate Voting Common Stock Item 2(e). CUSIP Number: 302043104 Item 3. This statement is filed pursuant to Rule 13d-1(b) or 13d-2(b) and the person filing, FMR Corp., is a parent holding company in accordance with Section 240.13d-1(b)(ii)(G). (Note: See Item 7). Item 4. Ownership (a) Amount Beneficially Owned: 4,583,100 (b) Percent of Class: 15.000% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 68,100 (ii) shared power to vote or to direct the vote: 0 (iii) sole power to dispose or to direct the disposition of: 4,583,100 (iv) shared power to dispose or to direct the disposition of: 0 Item 5. Ownership of Five Percent or Less of a Class. Not applicable. Item 6. Ownership of More than Five Percent on Behalf of Another Person. Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Subordinate Voting Common Stock of EXFO Electro-Optical Engineering Incorporated. The interest of one person, Canadian Growth Company Fund, an investment company registered under the Investment Company Act of 1940, in the Subordinate Voting Common Stock of EXFO Electro-Optical Engineering Incorporated, amounted to 1,898,000 shares or 6.212% of the total outstanding Subordinate Voting Common Stock at December 31, 2004. The interest of one person, FICL Canadian Asset Alloc-cad, an investment company registered under the Investment Company Act of 1940, in the Subordinate Voting Common Stock of EXFO Electro-Optical Engineering Incorporated, amounted to 2,500,000 shares or 8.182% of the total outstanding Subordinate Voting Common Stock at December 31, 2004. Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company. See attached Exhibit(s) A, B. Item 8. Identification and Classification of Members of the Group. Not Applicable. See attached Exhibit A. Item 9. Notice of Dissolution of Group. Not applicable. Item 10. Certification. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purpose or effect. Signature After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this Schedule 13G in connection with FMR Corp.'s beneficial ownership of the Subordinate Voting Common Stock of EXFO Electro- Optical Engineering Incorporated at December 31, 2004 is true, complete and correct. February 14, 2005 Date /s/Eric D. Roiter Signature Eric D. Roiter Duly authorized under Power of Attorney dated December 30, 1997 by and on behalf of FMR Corp. and its direct and indirect subsidiaries SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) Pursuant to the instructions in Item 7 of Schedule 13G, Fidelity Management & Research Company ("Fidelity"), 82 Devonshire Street, Boston, Massachusetts 02109, a wholly-owned subsidiary of FMR Corp. and an investment adviser registered under Section 203 of the Investment Advisers Act of 1940, is the beneficial owner of 4,583,100 shares or 15.000% of the Subordinate Voting Common Stock outstanding of EXFO Electro-Optical Engineering Incorporated ("the Company") as a result of acting as investment adviser to various investment companies registered under Section 8 of the Investment Company Act of 1940. The ownership of one investment company, Canadian Growth Company Fund, amounted to 1,898,000 shares or 6.212% of the Subordinate Voting Common Stock outstanding. Canadian Growth Company Fund has its principal business office at 82 Devonshire Street, Boston, Massachusetts 02109. The ownership of one investment company, FICL Canadian Asset Alloc-cad, amounted to 2,500,000 shares or 8.182% of the Subordinate Voting Common Stock outstanding. FICL Canadian Asset Alloc-cad has its principal business office at 82 Devonshire Street, Boston, Massachusetts 02109. Edward C. Johnson 3d, FMR Corp., through its control of Fidelity, and the funds each has sole power to dispose of the 4,583,100 shares owned by the Funds. Neither FMR Corp. nor Edward C. Johnson 3d, Chairman of FMR Corp., has the sole power to vote or direct the voting of the shares owned directly by the Fidelity Funds, which power resides with the Funds' Boards of Trustees. Fidelity carries out the voting of the shares under written guidelines established by the Funds' Boards of Trustees. Members of the Edward C. Johnson 3d family are the predominant owners of Class B shares of common stock of FMR Corp., representing approximately 49% of the voting power of FMR Corp. Mr. Johnson 3d owns 12.0% and Abigail Johnson owns 24.5% of the aggregate outstanding voting stock of FMR Corp. Mr. Johnson 3d is Chairman of FMR Corp. and Abigail P. Johnson is a Director of FMR Corp. The Johnson family group and all other Class B shareholders have entered into a shareholders' voting agreement under which all Class B shares will be voted in accordance with the majority vote of Class B shares. Accordingly, through their ownership of voting common stock and the execution of the shareholders' voting agreement, members of the Johnson family may be deemed, under the Investment Company Act of 1940, to form a controlling group with respect to FMR Corp. SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) RULE 13d-1(f)(1) AGREEMENT The undersigned persons, on February 14, 2005, agree and consent to the joint filing on their behalf of this Schedule 13G in connection with their beneficial ownership of the Subordinate Voting Common Stock of EXFO Electro-Optical Engineering Incorporated at December 31, 2004. FMR Corp. By /s/ Eric D. Roiter Eric D. Roiter Duly authorized under Power of Attorney dated December 30, 1997, by and on behalf of FMR Corp. and its direct and indirect subsidiaries Edward C. Johnson 3d By /s/ Eric D. Roiter Eric D. Roiter Duly authorized under Power of Attorney dated December 30, 1997, by and on behalf of Edward C. Johnson 3d Abigail P. Johnson By /s/ Eric D. Roiter Eric D. Roiter Duly authorized under Power of Attorney dated December 30, 1997, by and on behalf of Abigail P. Johnson Fidelity Management & Research Company By /s/ Eric D. Roiter Eric D. Roiter Senior V.P. and General Counsel Canadian Growth Company Fund By /s/John H. Costello John H. Costello Fidelity Investments Canada Limited, as trustee of Canadian Growth Company Fund FICL Canadian Asset Alloc-cad By /s/John H. Costello John H. Costello Fidelity Investments Canada Limited, as trustee of FICL Canadian Asset Alloc-cad