For the increasing complexity of integrated optical structures, there is a need of bends, which occupy a chip area as small as possible. The best results with respect to loss can be obtained by adiabatic bends with decreasing radius and variable waveguide width. Detailed simulations using 2D bend (mode) solver and adiabatic conformally-mapped 2D-BPM have been carried out in order to achieve a minimal size. Comparison is made with other approaches like standard bends with offsets.
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