3次元不規則導波路系の端面による平面波の散乱問題を摂動法により取り扱い，遠方散乱界を解析的に導出する．入射波としてTEおよびTM平面波を仮定する．遠方界の数値例を示し，遠方界の，入射波の偏波およびコア配置への依存性を議論する．遠方界はコアの断面上の入射波の位相のフーリエ変換で表わされ，入射波の偏波にほとんど依存しない．%A scattering problem of a plane wave from the end face of a three-dimensional disordered waveguide system is treated by the perturbation method and the far scattered field is analytically derived. The incident plane waves of a TE and a TM type are assumed. Numerical examples are shown and the dependence of the far field on the polarization of the incident wave and the arrangement of cores is discussed. The far field is expressed as the Fourier transform of the phase of the incident wave on the cross sections of cores and does not almost depend on the polarization of the incident wave.
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