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My Research At the present, the communication system using optical fiber is interesting and important. Thus, I am researching about optical waveguide analysis. I am interested the propagation characteristics of optical waveguides, since they are the most important passive elements which can operate as power dividers, switches, and combiners in optical integrated circuits. I will analyze the physical structure of Y-junction optical waveguide by using the finite element beam propagation method (FE-BPM). The analysis is based on beam propagation method (BPM) that is the numerical simulation of the field in a guide, not an approximate solution to the exact wave equation. The BPM can help to determine the mode profile in an unusual waveguide, and it can determine the dynamic behavior of mode as the index profile changes along with z. This latter effect is very common in practical devices such as waveguide tapers, or in waveguides perturbed by a second nearby waveguide. The beam propagation method works by slightly different direction. After advancing each wave, a certain distance through the structure of interest, the plane waves are added back together to reconstruct the spatial mode into the superposition of plane waves, and back again. |