Filed  Pursuant to Rule 424(b)(4)
                                                      Registration No. 333-65526


                          Prospectus Supplement No. 11
                       To Prospectus Dated August 31, 2001

                                  $175,000,000

                                  ------------

                               EMCORE Corporation
                   5% Convertible Subordinated Notes Due 2006
           and the Common Stock Issuable Upon Conversion of the Notes

          This  prospectus  supplement  relates  to the  resale  by the  selling
securityholders  of  5%  convertible  subordinated  notes  due  2006  of  EMCORE
Corporation and the shares of common stock, no par value, of EMCORE  Corporation
issuable upon the conversion of the notes.

          This  prospectus  supplement  should be read in  conjunction  with the
prospectus dated August 31, 2001, and the prospectus supplements dated September
18, 2001,  October 10, 2001,  October 30, 2001,  November 30, 2001,  January 10,
2002,  February 1, 2002,  May 22,  2002,  June 11,  2002,  September 3, 2002 and
October 9, 2002, which are to be delivered with the prospectus  supplement.  All
capitalized terms used but not defined in this prospectus  supplement shall have
the meanings given them in the prospectus.

          The  table  below  sets  forth  information  as  of  the  date  hereof
concerning  beneficial ownership of the notes of the selling  securityholders as
listed below. All information concerning beneficial ownership has been furnished
by the selling securityholders.
                                                                                         
                                       Principal Amount of
                                        Maturity of Notes     Percentage of     Number of Shares     Percentage of
                                       Beneficially Owned        Notes           of Common Stock      Common Stock
Name                                    that May be Sold       Outstanding     That May Be Sold(1)   Outstanding(2)(3)
- --------------------------------       -------------------    -------------    -------------------   -----------------
Salomon Brothers Asset                     $2,000,000(4)           1.1%               41,014                 *
Management Inc.
399 Park Avenue, 4th Floor
New York, NY  10022




- ---------------
*    Less than 1%

(1)  Assumes  conversion  of all the  holder's  notes at a  conversion  price of
     $48.7629 per share of common stock.  However, this conversion price will be
     subject to adjustment  as described in the  accompanying  prospectus  under
     "Description  of Notes-Right  of  Conversion."  As a result,  the amount of
     common stock issuable upon conversion of the notes may increase or decrease
     in the future.

(2)  Calculated  based on Rule  13d-3(d)(i) of the Exchange Act using 35,408,474
     shares of common stock  outstanding  as of August 24, 2001. In  calculating
     this amount, we treated as outstanding the number of shares of common stock
     issuable upon conversion of all of that particular holder's notes. However,
     we did not assume the conversion of any other holder's notes.


(3)  The  amounts  presented  herein are in  addition  to those  reported by the
     selling  securityholders  in the  accompanying  prospectus dated August 31,
     2001 and the accompanying  prospectus supplements dated September 18, 2001,
     October 10,  2001,  October 30, 2001,  November 30, 2001,  January 10, 2002
     February 1, 2002,  May 22,  2002,  June 11,  2002,  September  30, 2002 and
     October 9, 2002.

(4)  Does not include $7,000,000 of notes previously  registered by this selling
     securityholder.

                               -------------------

INVESTING IN THE SECURITIES  OFFERED HEREBY  INVOLVES A HIGH DEGREE OF RISK. SEE
"RISK FACTORS" BEGINNING ON PAGE 10 OF THE ACCOMPANYING PROSPECTUS.

THE SECURITIES AND EXCHANGE COMMISSION AND STATE SECURITIES  REGULATORS HAVE NOT
APPROVED OR  DISAPPROVED  OF THESE  SECURITIES OR DETERMINED IF THIS  PROSPECTUS
SUPPLEMENT  OR  THE  ACCOMPANYING   PROSPECTUS  IS  TRUTHFUL  OR  COMPLETE.  ANY
REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                               -------------------

            The date of this Prospectus Supplement is March 19, 2003.


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