Reflection analysis of the end-facet dielectric slab waveguide by FDTD method

The finite difference time domain (FDTD) method has been applied to the analysis of abruptly-ended dielectric waveguides. In these waveguides, the incident propagating wave undergoes reflection in an interaction with the end-facet. As a result of the discontinuity, all possible propagating modes may be excited. The constituent propagating modes are extracted from the reflected wave by the least square method. Thus, we present a good estimation of the amplitudes of the reflected modes. This full wave analysis technique is also capable of analyzing any arbitrarily shaped facet.