We present a method for full-wave characterization of optical waveguide structures. The method computes mode-propagation constants and cross-sectional field profiles from a straightforward discretization of Maxwell’s equations. These modes are directly excited in a three-dimensional finite-difference time-domain simulation to obtain optical field transmission and reflection coefficients for arbitrary waveguide discontinuities. The implementation uses the perfectly-matched-layer technique to absorb both guided modes and radiated fields. A scattered-field formulation is also utilized to allow accurate determination of weak scattered-field strengths. Individual three-dimensional waveguide sections are cascaded by <i>S</i>-parameter analysis. A complete 10<sup>4</sup>-section Bragg resonator is successfully simulated with the method.
© 2002 Optical Society of America
(000.3860) General : Mathematical methods in physics
(000.4430) General : Numerical approximation and analysis
(060.2310) Fiber optics and optical communications : Fiber optics
(230.1480) Optical devices : Bragg reflectors
(230.7370) Optical devices : Waveguides
Jon W. Wallace and Michael A. Jensen, "Analysis of optical waveguide structures by use of a combined finite-difference/ finite-difference time-domain method," J. Opt. Soc. Am. A 19, 610-619 (2002)