Theory of mode coupling in a photorefractive crystal waveguide

Abstract

The mode coupling among guided modes in a photorefractive crystal waveguide is investigated. coupled equations of guided modes in a photorefractive crystal waveguide. Analytical solutions of the couples equations are obtained for a two-mode photorefractive crystal waveguide. We also numerically analyze the coupled equations of guided modes in a multimode photorefractive crystal fiber. As a result of the coupling, power may flow to the fundamental mode or the highest-order mode, depending on the direction of the crystal optical axis. In addition, we report an analytical solution of the modal power in core and cladding for all guided HEvm, and EHvm modes for cylindrical fibers made of uniaxial crystals. (C) 2000 Optical Society of America [S0740-3224(00)02406-1].