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     <!-- Control Number: ny11164                                                          -->
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     <!-- Client Name:    Sycamore Networks, Incs.                                         -->
     <!-- Project Name:   8K                                                               -->
     <!-- Firm Name:      044830/0001                                                      -->
     <TITLE>Sycamore Networks, Inc.</TITLE>
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<H1 Align=CENTER><Font Face="Times New Roman, Times, Serif" Size=2>SECURITIES AND
EXCHANGE COMMISSION<Br>
WASHINGTON, D.C. 20549 </font></h1>

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<H1 Align=CENTER><Font Face="Times New Roman, Times, Serif" Size=2>FORM 8-K </font></h1>

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<P 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></p>

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<A Name=A007></a>
<P Align=CENTER><Font Face="Times New Roman, Times, Serif" Size=2>May 13, 2003<Br>Date of Report (Date of earliest
event reported) </font></p>

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<P Align=CENTER><Font Face="Times New Roman, Times, Serif" Size=2><B>SYCAMORE NETWORKS, INC. </b><Br>(Exact name of
registrant as specified in its charter) </font></p>

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<td Width=33% Align=left><Font Face="Times New Roman, Times, Serif" Size=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Delaware</font></td>
<td Width=34% Align=center><Font Face="Times New Roman, Times, Serif" Size=2>000-27273</font></td>
<td Width=33% Align=left><Font Face="Times New Roman, Times, Serif" Size=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;04-3410558</font></td>
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<td Width=33% Align=LEFT><Font Face="Times New Roman, Times, Serif" Size=2> (State or other jurisdiction <Br>of incorporation)</font></td>
<td Width=33% Align=center><Font Face="Times New Roman, Times, Serif" Size=2>  (Commission<Br> file number)</font></td>
<td Width=35% Align=left><Font Face="Times New Roman, Times, Serif" Size=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(IRS Employer<Br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Identification No.)</font></td>
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<P Align=CENTER><Font Face="Times New Roman, Times, Serif" Size=2>220 Mill Road<Br>Chelmsford, MA 01824<Br>(Address of principal
executive offices)<Br>(Zip code) </font></p>

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<P Align=CENTER><Font Face="Times New Roman, Times, Serif" Size=2>Registrant&#146;s
telephone number, including area code: (978) 250-2900  </font></p>

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<A Name=A015></a>
<P Align=CENTER><Font Face="Times New Roman, Times, Serif" Size=2>Not Applicable<Br>(Former
name or former address, if changed since last report) </font></p>


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<A Name=A016></a>
<H1 Align=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>Item 7: Financial
Statements, <I>Pro Forma </I>Financial Information and Exhibits</B> </FONT> </h1>

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<P Align=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><I>(c)&nbsp;Exhibits</I> </FONT> </p>

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<td Width=8%><Font Face="Times New Roman, Times, Serif" Size=2>99.1  </font></td>
<td Width=92%><Font Face="Times New Roman, Times, Serif" Size=2>Press
Release of Sycamore Networks, Inc. (the "Registrant"), dated May 13, 2003, reporting the
              Registrant's third quarter results for the period ended April 26, 2003
(furnished and not filed herewith solely pursuant to Item 12).</font></td>
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      <A Name=A018></a>
      <H1 Align=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>Item
        9: Regulation FD Disclosure (Information furnished pursuant to Item 12.
        &nbsp;Results of Operations and Financial Condition)</B> </FONT>
      </h1>

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<P><Font Face="Times New Roman, Times, Serif" Size=2>On May 13, 2003, the Registrant
reported its third quarter results for the period ended April 26, 2003. A copy of the
press release issued by the Registrant on May 13, 2003 concerning the foregoing results is
furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

<BR>
<BR>
        The information contained herein and in the accompanying exhibit is being
        furnished pursuant to "Item 12. Results of Operations and Financial Condition"
        in acordance with interim guidance issued by the Securities and Exchange
        Commission in Release No. 33-8216. 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 to 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></p>

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<P><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></p>


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<H1 Align=CENTER><Font Face="Times New Roman, Times, Serif" Size=2>SIGNATURES </font></h1>

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<P><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></p>

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<A Name=A020></a>
<P Align=LEFT><Font Face="Times New Roman, Times, Serif" Size=2>Sycamore Networks, Inc. </font></p>

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<td Width=70%><Font Face="Times New Roman, Times, Serif" Size=2>&nbsp;<U>/s/Frances M. Jewels</u><Br>Frances M. Jewels<Br>
Chief Financial Officer<Br>(Duly Authorized Officer and Principal <Br> Financial and Accounting Officer) </font></td>
<td Width=30%><Font Face="Times New Roman, Times, Serif" Size=2>&nbsp;</font></td>
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<P Align=LEFT><Font Face="Times New Roman, Times, Serif" Size=2>Dated: May 13, 2003 </font></p>


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<H1 Align=CENTER><Font Face="Times New Roman, Times, Serif" Size=2>EXHIBIT INDEX </font></h1>

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<td Width=15%><Font Face="Times New Roman, Times, Serif" Size=2>Exhibit<Br><U>Number</u> </font></td>
<td Width=85%><Font Face="Times New Roman, Times, Serif" Size=2>
<U>Description </u></font></td>
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<td Width=15%><Font Face="Times New Roman, Times, Serif" Size=2>99.1 </font></td>
<td Width=85%><Font Face="Times New Roman, Times, Serif" Size=2>
Press Release of the Registrant, dated May 13, 2003, reporting the Registrant&#146;s third
quarter results for the period ended April 26, 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": "03695732"}, "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"}}
Sycamore Networks, Inc.
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
May 13, 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 7: Financial
Statements,
Pro Forma
Financial Information and Exhibits
(c) Exhibits
99.1
Press
Release of Sycamore Networks, Inc. (the "Registrant"), dated May 13, 2003, reporting the
              Registrant's third quarter results for the period ended April 26, 2003
(furnished and not filed herewith solely pursuant to Item 12).
Item
        9: Regulation FD Disclosure (Information furnished pursuant to Item 12.
         Results of Operations and Financial Condition)
On May 13, 2003, the Registrant
reported its third quarter results for the period ended April 26, 2003. A copy of the
press release issued by the Registrant on May 13, 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 is being
        furnished pursuant to "Item 12. Results of Operations and Financial Condition"
        in acordance with interim guidance issued by the Securities and Exchange
        Commission in Release No. 33-8216. 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 to 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: May 13, 2003
EXHIBIT INDEX
Exhibit
Number
Description
99.1
Press Release of the Registrant, dated May 13, 2003, reporting the Registrant's third
quarter results for the period ended April 26, 2003.