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                                                                    EXHIBIT 23.8

                          CONSENT OF FINANCIAL ADVISOR


We consent to inclusion of our opinion dated October 4, 2001 as Annex B to the
prospectus supplement included in Post-Effective Amendment No. 1 to Registration
Statement on Form S-4 (the "Registration Statement") of MRV Communications and
to all references to us in the Registration Statement.

By providing our opinion or by giving this consent, we do not admit that we are
experts with respect to any part of the Registration Statement within the
meaning of the term "expert": as used in the United States securities laws, or
the rules and regulations promulgated thereunder by the Securities and Exchange
Commission, nor do we admit that we are in the category of persons whose consent
is required.

October 4, 2001
Los Angeles, California

                                            /s/ Duff & Phelps, LLC

                                            DUFF & PHELPS, LLC