Abstract
Extensions of coupled-mode theory for splice of different optical fiber with arbitrary refractive index profiles is considered. Solutions for optical fibers were obtained by Gaussian approximation based on approximation of fiber optical waveguide with arbitrary index profile to equivalent optical waveguide with parabolic index profile. A mode coupling coefficients at splice of different optical fibers are determined by analytical expressions for splice of fiber lightguides with parabolic index profile and non-identical geometric parameters. Redistribution of energy of optical emission between modes up to condition of balanced mode distribution is determined as a decision of equations of coupling mode of equivalent lightguide with parabolic index profile. The results of investigations of mode dependent on geometric conditions of splice are represented.
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