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     <!-- Control Number: form8k                                                           -->
     <!-- Filing Type:    8k                                                               -->
     <!-- Client Name:    Sycamore Networks                                                     -->
     <!-- Project Name:   ny11781                                               -->
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<TD><H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2> 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 WIDTH="600" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"> August 19, 2003 </FONT></TD></TR>
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     <TD WIDTH="600" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Date of Report (Date of earliest event reported) </FONT></TD></TR>
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<TR VALIGN="BOTTOM">
     <TD WIDTH="600" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>SYCAMORE NETWORKS, INC.</B></FONT></TD></TR>
<TR VALIGN="TOP">
     <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 Align=CENTER Width=33%><Font Face="Times New Roman, Times, Serif" Size=2>Delaware </font></td>
<td Align=CENTER Width=34%><Font Face="Times New Roman, Times, Serif" Size=2> 000-27273  </font></td>
<td Align=CENTER Width=33%><Font Face="Times New Roman, Times, Serif" Size=2>04-3410558</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)
</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 Road <BR>Chelmsford, MA &nbsp;01824 <BR>
(Address of principal executive offices)<BR>
(Zip code)</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:&nbsp;(978) 250-2900 </FONT></TD></TR>
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     <TD WIDTH="600" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"> Not Applicable </FONT></TD></TR>
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     <TD WIDTH="600" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">(Former name or former address, if changed since last report) </FONT></TD></TR>
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<TD>
<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Item
12: &nbsp;Results of Operations and Financial Condition</FONT></H1></TD></TR>
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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>On
August 19, 2003, the Registrant reported its fourth quarter and fiscal year end results
for the period ended July 31, 2003. A copy of the press release issued by the Registrant
on August 19, 2003 concerning the foregoing results is furnished herewith as Exhibit 99.1
and is incorporated herein by reference. </FONT></TD></TR></TABLE><BR>

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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>The
information contained herein and in the accompanying exhibit shall not be incorporated by
reference into any filing of the Registrant, whether made before or after the date hereof,
regardless of any general incorporation language in such filing, unless expressly
incorporated by specific reference into such filing. The information in this report,
including the exhibit hereto, shall not be deemed to be &#147;filed&#148; for purposes of
Section&nbsp;18 of the Securities Exchange Act of 1934, as amended, or otherwise subject
to the liabilities of that section or Sections&nbsp;11 and 12(a)(2) of the Securities Act
of 1933, as amended. </FONT></TD></TR></TABLE><BR>

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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>The
Registrant provides pro forma financial data in addition to providing financial results in
accordance with generally accepted accounting principles (&#147;GAAP&#148;). These
measures are not in accordance with, or an alternative for, GAAP and may be different from
pro forma measures used by other companies. The Registrant believes that this presentation
of pro forma financial data provides useful information to management and investors
regarding certain additional financial and business trends relating to its financial
condition and results of operations. In addition, the Registrant&#146;s management uses
these measures for reviewing the Registrant&#146;s financial results and for
budget-planning purposes. </FONT></TD></TR></TABLE><BR>

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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><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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  <TR VALIGN="BOTTOM">
<TD WIDTH=40%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>/s/ Frances M. Jewels</FONT></TD></TR>
<TR VALIGN=TOP>
<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2> </FONT><HR NOSHADE SIZE="1"></TD>

</TR>

<TR VALIGN=TOP>
<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Frances M. Jewels</FONT></TD>
<TD COLSPAN=2> &nbsp;</TD>
<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>

<TR VALIGN=TOP>
<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Chief Financial Officer</FONT></TD>
<TD COLSPAN=2> &nbsp;</TD>
<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>

<TR VALIGN=TOP>
<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(Duly
Authorized Officer and Principal<BR>Financial  and Accounting Officer)</FONT></TD>
<TD COLSPAN=2> &nbsp;</TD>
<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
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<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Dated:
August 19, 2003 </FONT></P></TD></TR>
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<TD><H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>EXHIBIT
INDEX </FONT></H1></TD></TR>
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<TD WIDTH="12%" VALIGN="BOTTOM"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Exhibit<BR><u>Number </u></FONT></TD>
<TD WIDTH="82%" VALIGN="BOTTOM"><FONT FACE="Times New Roman, Times, Serif" SIZE=2><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=82%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
Press Release of the Registrant, dated August 19, 2003, reporting the Registrant&#146;s
fourth quarter and fiscal year end results for the period ended July 31, 2003.</FONT></TD>
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{"company-data": {"conformed-name": "SYCAMORE NETWORKS INC", "cik": "0001092367", "assigned-sic": "3661", "irs-number": "043410558", "state-of-incorporation": "DE", "fiscal-year-end": "0731"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-27273", "film-number": "03855893"}, "business-address": {"street1": "220 MILL ROAD", "city": "CHELMSFORD", "state": "MA", "zip": "01824", "phone": "9782502900"}, "mail-address": {"street1": "220 MILL ROAD", "city": "CHELMSFORD", "state": "MA", "zip": "01824"}}
8K Form
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
August 19, 2003
Date of Report (Date of earliest event reported)
SYCAMORE NETWORKS, INC.
(Exact name of registrant as specified in its charter)
Delaware
000-27273
04-3410558
(State or other jurisdiction
of incorporation)
(Commission
file number)
(IRS Employer
Identification No.)
220
Mill Road
Chelmsford, MA  01824
(Address of principal executive offices)
(Zip code)
Registrant's
Telephone Number, including Area Code: (978) 250-2900
Not Applicable
(Former name or former address, if changed since last report)
Item
12:  Results of Operations and Financial Condition
On
August 19, 2003, the Registrant reported its fourth quarter and fiscal year end results
for the period ended July 31, 2003. A copy of the press release issued by the Registrant
on August 19, 2003 concerning the foregoing results is furnished herewith as Exhibit 99.1
and is incorporated herein by reference.
The
information contained herein and in the accompanying exhibit shall not be incorporated by
reference into any filing of the Registrant, whether made before or after the date hereof,
regardless of any general incorporation language in such filing, unless expressly
incorporated by specific reference into such filing. The information in this report,
including the exhibit hereto, shall not be deemed to be "filed" for purposes of
Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject
to the liabilities of that section or Sections 11 and 12(a)(2) of the Securities Act
of 1933, as amended.
The
Registrant provides pro forma financial data in addition to providing financial results in
accordance with generally accepted accounting principles ("GAAP"). These
measures are not in accordance with, or an alternative for, GAAP and may be different from
pro forma measures used by other companies. The Registrant believes that this presentation
of pro forma financial data provides useful information to management and investors
regarding certain additional financial and business trends relating to its financial
condition and results of operations. In addition, the Registrant's management uses
these measures for reviewing the Registrant's financial results and for
budget-planning purposes.
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/ Frances M. Jewels
Frances M. Jewels
Chief Financial Officer
(Duly
Authorized Officer and Principal
Financial  and Accounting Officer)
Dated:
August 19, 2003
EXHIBIT
INDEX
Exhibit
Number
Description
99.1
Press Release of the Registrant, dated August 19, 2003, reporting the Registrant's
fourth quarter and fiscal year end results for the period ended July 31, 2003.