<title>FD-BPM analysis to design the optimum structure and size of bent waveguide with small radius</title>

Abstract

A new version of the semi-vectorial Finite-Difference Beam Propagation Method equation in cylindrical coordinates is introduced to analyze and design the small radius of bent wave-guide in which the strong lateral confinement keeps the low-loss of radiation. The slowly varying envelope wave is finite-differenced in taking into account of the discontinuities of the electric field components across any arbitrary distribution of internal dielectric interfaces under the approximation of no coupling between the different polarized components. This version of equation can model the polarization effect of optical field and gives good results for the power loss rates even at radii < 100 micrometers . Using the implicit alternating method, the algorithm of 3D-wave equation is improved to carry out very stably and quickly.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.