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

April 29, 2009

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)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

 o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

 o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

 o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

 o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 2.05: Costs Associated with Exit or Disposal Activities.

On April 29, 2009, the Registrant announced, in response to current economic conditions and the resulting weakness in the global telecommunications market, that it will reduce its global workforce by approximately 30%.  This action, expected to be completed over the next several quarters, will affect all functional organizations and multiple geographic locations.  The Registrant expects that this reduction will result in aggregate restructuring charges in the range of $4.0 million to $5.0 million primarily associated with employee separation packages, which include severance pay, benefits continuation and outplacement services.  The Registrant anticipates that this action, when completed, will result in annualized cost savings in the range of  $17.0 million to $18.0 million.

A copy of the press release issued by the Registrant with respect to the foregoing is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

Item 9.01: Financial Statements and Exhibits.

(d) Exhibits

Exhibit
Number	Description
99.1	Press Release of the Registrant, dated April 29, 2009.

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/ Alan R. Cormier

Alan R. Cormier

General Counsel and Secretary

Dated: April 29, 2009