Exhibit 23.2

                       CONSENT OF INDEPENDENT ACCOUNTANTS

     We hereby consent to the incorporation by reference in this Registration
Statement on Form S-8 of Sycamore Networks, Inc. (the "Company"), relating to
the Company's stock incentive plans, employee stock purchase plan and
non-employee directors option plan, of our report dated August 23, 1999 relating
to the financial statements of Sycamore Networks, Inc., which appears in the
Company's Registration Statement on Form S-1 (File No. 333-84635).

/s/ PricewaterhouseCoopers LLP
Boston, Massachusetts
November 12, 1999