Exhibit 32.2

                                  Harmonic Inc.
                 Certification of Principal Financial Officer
          Pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to
                Section 906 of the Sarbanes-Oxley Act of 2002

As of the date hereof, I, Robin N. Dickson, Chief Financial Officer of Harmonic
Inc. (the "Company"), certify, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the annual
report of the Company on Form 10-K for the fiscal year ended December 31, 2003,
as filed with the Securities and Exchange Commission (the "Report"), fully
complies with the requirements of Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 and that information contained in the Report fairly
presents, in all material respects, the financial condition and results of
operations of the Company. This written statement is being furnished to the
Securities and Exchange Commission as an exhibit accompanying such Report and
shall not be deemed filed pursuant to the Securities Exchange Act of 1934.

Date:  March 8, 2004

                                       /s/ Robin N. Dickson
                                       ---------------------------------
                                       Robin N. Dickson
                                       Chief Financial Officer
                                       (Principal Financial Officer)