Abstract
This work examines the diffusion equation of radiation by modes in a waveguide with random inhomogeneities and absorbing walls. For the case of a constant average refractive index, analytical results are derived for the model intensity distribution functions and average energy density for both regular and irregular waveguides. The characteristic spatial parameter r/sub o/ is found, which determines the role of random inhomogeneities in the waveguide. In the absence of random inhomogeneities (r/sub o/ /yields/ /infinity/) the operating equations reduce to the familiar equations for the average field intensity.
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