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     <!-- Project:        untitled                                                         -->
     <!-- Control Number: ny13385                                                          -->
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     <!-- Client Name:    Sycamore Networks, Inc.                                          -->
     <!-- Project Name:   Form 8-k                                                         -->
     <!-- Firm Name:      Skadden, Arps, Slate, Meagher & Flom LLP                         -->
     <TITLE>Form 8-k</TITLE>
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<TD><H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>UNITED
STATES<br>SECURITIES AND EXCHANGE COMMISSION<br>Washington, D.C. 20549  </FONT></H1></TD></TR>
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<TD><H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>FORM
8-K  </FONT></H1></TD></TR>
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<TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>CURRENT
REPORT<BR>Pursuant to Section 13 or 15(d) of the<BR> Securities Exchange Act of 1934  </FONT></TD></TR>
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<TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>October 5, 2004<br>Date
of Report (Date of earliest event reported)</FONT></TD></TR>
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     <TD WIDTH="600" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>&nbsp;<!-- Name of Registrant -->SYCAMORE NETWORKS, INC.</B></FONT></TD></TR>
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     <TD WIDTH="600" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">(Exact Name of Registrant as Specified in its Charter)</FONT></TD></TR>
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<TD WIDTH="33%" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2><!-- State-->Delaware</FONT></TD>
<TD WIDTH="34%" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2><!-- File No.-->000-27273</FONT></TD>
<TD WIDTH="33%" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2><!-- Irs No.-->04-341-558</FONT></TD>
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<TD ALIGN="CENTER"><Font Face="Times New Roman, Times, Serif" Size=2>(State or Other Jurisdiction <BR>of Incorporation or Organization)</font></td>
<TD ALIGN="CENTER"><Font Face="Times New Roman, Times, Serif" Size=2>(Commission<BR>File Number) </FONT></TD>
<TD ALIGN="CENTER"><Font Face="Times New Roman, Times, Serif" Size=2>(IRS Employer<BR> Identification No.) </FONT></TD>
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<TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>220
Mill<BR> Road Chelmsford, MA 01824<BR>(Address of Principal Executive Offices)</FONT></TD></TR>
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<TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Registrant's
Telephone Number, including Area Code:  (978) 250-2900 </FONT></TD></TR>
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Applicable<BR>(Former Name or Former Address, if Changed Since Last Report) </FONT></TD></TR>
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<TD WIDTH=12%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B><U>Item 5.02</U></B></FONT></TD>
<TD WIDTH=88%><FONT FACE="Times New Roman, Times, Serif" SIZE=2> <B>Departure of Directors or Principal Officers; Election of Directors; Appointment of
Principal Officers.</B></FONT></TD>
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<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(b) </FONT></P>


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    <TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;
      &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On
      October 5, 2004, Sycamore Networks, Inc. (the &#147;Company&#148;) issued
      a press release announcing that Richard J. Gaynor will be joining Sycamore
      as Chief Financial Officer and Vice President of Finance and Administration
      effective October 5, 2004. Frances M. Jewels has resigned from such positions
      effective as of such date, however, will remain with the Company in an advisory
      capacity. </FONT></TD>
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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
press release issued on October 5, 2004 is attached hereto as Exhibit 99.1 and is
incorporated herein by reference.  </FONT></TD></TR>
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<TD><H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SIGNATURES  </FONT></H1></TD></TR>
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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Pursuant
to the requirements of the Securities Exchange Act of 1934, the Registrant has duly
caused this report to be signed on its behalf by the undersigned thereunto duly
authorized.  </FONT></TD></TR></TABLE><BR><BR>



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<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Sycamore
Networks, Inc.  </FONT></P></TD></TR>
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<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>/s/ Daniel
        E. Smith</U><BR>
        Daniel E. Smith<BR>
        President and Chief Executive Officer<BR>
        </FONT></P></TD></TR>
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<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Dated:
October 5, 2004  </FONT></P></TD></TR>
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<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>EXHIBIT
INDEX </FONT></P></TD></TR>
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<TD WIDTH=12%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Exhibit<BR><U>Number</U></FONT></TD>
<TD WIDTH=88%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;<BR><U>Description</U></FONT></TD>
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<TD WIDTH=12%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>99.1 </FONT></TD>
<TD WIDTH=88%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
Press
Release of the Registrant, dated October 5, 2004, reporting the resignation of its chief
financial officer.</FONT></TD>
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Form 8-k
UNITED
STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM
8-K
CURRENT
REPORT
Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934
October 5, 2004
Date
of Report (Date of earliest event reported)
SYCAMORE NETWORKS, INC.
(Exact Name of Registrant as Specified in its Charter)
Delaware
000-27273
04-341-558
(State or Other Jurisdiction
of Incorporation or Organization)
(Commission
File Number)
(IRS Employer
Identification No.)
220
Mill
Road Chelmsford, MA 01824
(Address of Principal Executive Offices)
Registrant's
Telephone Number, including Area Code:  (978) 250-2900
Not
Applicable
(Former Name or Former Address, if Changed Since Last Report)
Item 5.02
Departure of Directors or Principal Officers; Election of Directors; Appointment of
Principal Officers.
(b)
On
      October 5, 2004, Sycamore Networks, Inc. (the "Company") issued
      a press release announcing that Richard J. Gaynor will be joining Sycamore
      as Chief Financial Officer and Vice President of Finance and Administration
      effective October 5, 2004. Frances M. Jewels has resigned from such positions
      effective as of such date, however, will remain with the Company in an advisory
      capacity.
The
press release issued on October 5, 2004 is attached hereto as Exhibit 99.1 and is
incorporated herein by reference.
SIGNATURES
Pursuant
to the requirements of the Securities Exchange Act of 1934, the Registrant has duly
caused this report to be signed on its behalf by the undersigned thereunto duly
authorized.
Sycamore
Networks, Inc.
/s/ Daniel
        E. Smith
Daniel E. Smith
President and Chief Executive Officer
Dated:
October 5, 2004
EXHIBIT
INDEX
Exhibit
Number
Description
99.1
Press
Release of the Registrant, dated October 5, 2004, reporting the resignation of its chief
financial officer.