Washington, DC 20549

                    Under the Securities Exchange Act of 1934

                               (Amendment No. 2)

                               EMCORE CORPORATION
                                (Name of Issuer)

                         (Title of Class of Securities)

                                December 31, 2003
             (Date of Event Which Requires Filing of this Statement)

                   Check the appropriate box to designate the
                 rule pursuant to which this Schedule is filed:

                                [ ] Rule 13d-1(b)
                                [X] Rule 13d-1(c)
                                [ ] Rule 13d-1(d)

                                  (CUSIP NUMBER)

1)        Name of Reporting                      Pioneer
          Person                                 Global Asset

          IRS Identification                     98-0362802
          No. of Above

2)        Check the Appropriate Box              (a)
          of A Member of  Group
          (See Instructions)                     (b)

3)        SEC Use Only

4)        Citizenship of Place of
          Organization                           Milan,Italy

          Number of                              (5)  Sole Voting
          Shares                                 Power
          Beneficially Owned                     (6)  Shared Voting
          by Each Reporting                      Power
          Person With                            (7)  Sole Dispositive
                                                 (8)  Shared Disposi-
                                                 Dispositive Power

9)        Aggregate Amount Beneficially
          Owned by Each
          Reporting Person

10)       Check if the aggregate
          Amount in Row  (9) Exclude Certain
          Shares (See

11)       Percent of Class Represented
          By Amount in Row 9.

12)       Type of Reporting
          Person (See Instructions)

Item 1(a)         Name of Issuer.

                  EMCORE CORPORATION

Item 1(b)         Address of Issuer's Principal Executive Offices:

                  145 Belmont Drive
                  Somerset,  NJ   08873

Item 2(a)         Name of Person Filing:

                  Pioneer Global Asset Management S.p.A.

Item 2(b)         Address of Principal Business Office:

                  Galleria San Carlo 6
                  20122 Milan, Italy

Item 2(c)         Citizenship:


Item 2(d)         Title of Class of Securities:.

                  Common Stock

Item 2(e)         CUSIP Number:


Item 3.           The person filing this statement pursuant to Rule 13d-1(b)
                  or 13d-2(b) is:


Item 4.  Ownership.

(a)        Amount Beneficially Owned:

(b)        Percent of Class:

(c)      Number of shares as to which such person has

         (i)      sole power to vote or to direct the vote

         (ii)     shared power to vote or to direct vote

         (iii)    sole power to dispose or to direct disposition of

(iv) shared power to dispose or to direct disposition

Item 5.  Ownership of Five Percent or Less of a Class.

If this statement is being filed to report the fact that as of the date hereof
the reporting person has ceased to be the beneficial owner of more than five
percent of the class of securities, check here: YES

Item 6.  Ownership of More than Five Percent on Behalf of Another Person.


Item 7.  Identification and Classification of the Subsidiary Which Acquired
         the Security Being Reported On By the Parent Holding Company.


Item 8.  Identification and Classification of Members of the Group.


Item 9.  Notice of Dissolution of the Group.


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 transactions having
such purposes or effect.

         After reasonable inquiry and to the best of my knowledge and believe, I
certify that the information set forth in this statement is true, complete and

                  February 6, 2004

                  /s/Dario Frigerio
                  Dario Frigerio
                  Chief Executive Officer