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                                                                    Exhibit 23.3

                       CONSENT OF INDEPENDENT ACCOUNTANTS

   We hereby consent to the use in this Registration Statement on Form S-4 of
Sycamore Networks, Inc. of our report dated June 4, 2000 relating to the
financial statements of Sirocco Systems, Inc., a development stage company,
which appears in such Registration Statement. We also consent to the references
to us under the headings "Experts" and "Selected Historical Financial Data of
Sirocco" in such Registration Statement.

/s/ PricewaterhouseCoopers LLP

Hartford, Connecticut
June 26, 2000



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