This paper presents the implementation of a parallelized Finite-Difference Time-Domain method, based on the Message Passing Interface (i.e. MPI), which is used to study the modal properties of three-dimensional (3D) dielectric waveguide structures. To this end, we also use the least-square method to obtain the wave vector, β, along the axis of propagation. Lastly, bending losses in arbitrary-angle waveguides are also discussed.
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