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A self‐consistent procedure is suggested, designed to calculate the power leakage out of dielectric waveguide with field‐dependent dielectric constant. The method is to consider the guide, on the one hand, as a ‘‘black box’’ with an intrinsically lossy but linear medium and, on the other hand, as a guide with loss‐free linear medium but containing a radiating current source composed of the nonlinear terms. Equating the results for the two alternative viewpoints gives the effective decay constant.