The mode coupling among guided modes in a photorefractive crystal waveguide is investigated. We derive the coupled equations of guided modes in a photorefractive crystal waveguide. Analytical solutions of the coupled 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 HEνm and EHνm modes for cylindrical fibers made of uniaxial crystals.
© 2000 Optical Society of America
[Optical Society of America ]
Huang-Tzung Jan, Sien Chi, and Pochi Yeh, "Theory of mode coupling in a photorefractive crystal waveguide," J. Opt. Soc. Am. B 17, 1176-1181 (2000)