2 May 1994 Bidirectional beam propagation modeling of photonic structures based on mode expansion and matching
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The problem of optical wave propagation in dielectric waveguide structures with large refractive-index discontinuities and abrupt transitions that give rise to backreflections of the propagating wave is addressed. A set of `transmission-line equations' for the dominant transverse components of electric and magnetic fields in a semivectoral approximation is derived. The wave propagation is described by eigenmode expansion into both forward and backward waves in longitudinally discretized uniform sections using mode matching between the sections. Although the theory is valid for a general class of 3D structures (i.e., channel waveguides), the computer code for numerical calculations presented here was written for 2D (planar) structures only. Examples of wave propagation and reflection from waveguide discontinuities are given, and some problems evoked by the application of a reduced set of eigenmodes for the calculation are briefly discussed.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jiri Ctyroky and Jan Plesingr "Bidirectional beam propagation modeling of photonic structures based on mode expansion and matching", Proc. SPIE 2150, Design, Simulation, and Fabrication of Optoelectronic Devices and Circuits, (2 May 1994); doi: 10.1117/12.174981; https://doi.org/10.1117/12.174981

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