Washington, DC 20549

                    Under the Securities Exchange Act of 1934
                                (Amendment No. 0)

                               EMCORE CORPORATION
                                (Name of Issuer)

                         (Title of Class of Securities)

                                 (CUSIP NUMBER)

                                  Rebecca Cinci
                       Pioneer Investment Management, Inc.
                                 60 State Street
                                Boston, MA 02109
              (Name, Address and Telephone Number of Person Authorized to
                          Receive Notices and Communications)

                                February 25, 2004
             (Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box. [x]

1.        Name of Reporting Pioneer Global Asset Person Management S.p.A.

          IRS Identification                     98-0362802
          No. of Above

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

3.        SEC Use Only

4.        Source of Funds (See instructions) 00

5.        Check if Disclosure of Legal Proceedings Is Required Pursuant to Items
          2(d) or 2(e)

6.        Citizenship of Place of
          Organization                           Milan, Italy

          Number of                            7.  Sole Voting       10,444,837
          Shares                                   Power
          Beneficially Owned                   8.  Shared Voting     0
          by Each Reporting                        Power
          Person With                          9.  Sole Dispositive  10,444,837
                                               10. Shared Disposi-   0
                                                   Dispositive Power

11.       Aggregate Amount Beneficially
          Owned by Each
          Reporting Person                       10,444,837

12.       Check if the aggregate Amount in Row (11) Exclude Certain Shares (See
          Instructions) [ ]

13.       Percent of Class Represented By Amount in Row 11. 23.34%

14.       Type of Reporting
          Person (See Instructions)              HC

Item 1.  Security and Issuer
- ----------------------------

         The class of equity securities to which this Statement relates is the
common stock, $0.01 par value per share (the "Common Stock"), of Emcore
Corporation (the "Issuer"), the executive office of which is located at 145
Belmont Drive Somerset, NJ 08873.

Item 2.  Identity and Background
- --------------------------------

(a)  Name: Pioneer Global Asset Management S.p.A.

(b)  Residence or Business Address: Galleria San Carlo 6, 20122 Milan, Italy

(c)  Present Principal Occupation or Employment: Financial Services, Galleria
     San Carlo 6, 20122 Milan, Italy

(d)  None.

(e)  None.

(f)  Citizenship: Italy

Item 3.  Source and Amount of Funds or Other Consideration
- ----------------------------------------------------------

         The purchase of the Common  Stock was made with the  personal  funds of
Mr. Windisch. Mr. Windisch received 26,304 shares which may be acquired pursuant
to the exercise of options which were granted pursuant to compensation  plans of
the Issuer.

Item 4.  Purpose of Transaction
- -------------------------------

The Funds acquired the Common Stock of Emcore Corporation reported herein for
the purposes of investment. The Funds may, in the future, purchase additional
shares of Common Stock of Emcore Corporation or sell such securities.

The Funds do not have any present plan or proposal which would relate to or
result in transactions of the kind described in paragraphs (a) through (j) of
Item 4 of Schedule 13d-101 of the Securities and Exchange Commission. The Funds
reserve the right, in the future, to adopt such plans or proposals.

     (a)  the acquisition by any person of additional securities of the Issuer,
          or the disposition of securities of the Issuer;

     (b)  an extraordinary corporate transaction, such as a merger,
          reorganization or liquidation, involving the Issuer or any of its

     (c)  a sale or transfer of a material amount of assets of the Issuer or any
          of its subsidiaries;

     (d)  any change in the present board of directors or management of the
          Issuer, including any plans or proposals to change the number or term
          of directors or to fill any existing vacancies on the board;

     (e)  any material change in the present capitalization or dividend policy
          of the Issuer;

     (f)  any other material change in the Issuer's business or corporate

     (g)  changes in the Issuer's articles of incorporation, bylaws or
          instruments corresponding thereto or other actions which may impede
          the acquisition of control of the Issuer by any persons;

     (h)  causing a class of securities of the Issuer to be delisted from a
          national securities exchange or to cease to be authorized to be quoted
          in an inter-dealer quotation system of a registered national
          securities association;

     (i)  a class of equity securities of the Issuer becoming eligible for
          termination of registration pursuant to Section 12(g)(4) of the
          Securities Exchange Act of 1934, as amended; or

     (j)  any action similar to any of those enumerated above.

Item 5.  Interest in Securities of the Issuer
- ---------------------------------------------

         (a) The reporting person beneficially owns 10,444,837 shares of the
Issuer as of the date of this statement, representing 23.34% of the issued and
outstanding shares. This includes 4,538,881 shares of the Common Stock and
$47,602,000 5% 05/15/2011 convertible bonds, which represent 5,905,956 shares of
common stock upon conversion.

         (b) Pioneer Global Asset Management S.p.A exercises sole voting and
dispositive power over 10,444,837 shares.

         (c) On 02/25/2004 there was a corporate action exchange of $86,550,000
Emcore Corporation 5% 05/15/2006 (old) bonds for $47,602,000 5% 05/15/2011 (new)
bonds, and 4,538,881 shares of common stock.

         (d) No other person has any interest in the securities reported on
pursuant to his Schedule 13D.

         (e) Not applicable.

Item 6. Contracts, Arrangements, Understanding, or Relationships With Respect to
        Securities of the Issuer
- ------------------------------------------------------------------------------

         There are no contracts, arrangements, understandings, or relationships
between the undersigned and any other person with respect to the issuer's
securities, including but not limited to the transfer or voting of securities,
finder's fees, joint ventures, loan or option arrangements, puts or calls,
guarantees of profits, division of profits or loss, the giving or withholding of
proxies, or otherwise.

Item 7.  Material to be Filed as Exhibits
- -----------------------------------------

         Not applicable.

- -------

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

          March 5, 2004

          /s/Dario Frigerio
          Dario Frigerio
          Chief Executive Officer