10/29/2023 0 Comments Fdtd example lumericalIn particular, we need to determine the optimal incident angle θ in, laser beam waist radius ω 0 and the distance d between the center of the input laser beam and the end of the grating coupler(beginning of the waveguide). The grating itself has duty cycle of 50%, grating period of 500nm and the etching depth of the groves is 30nm as shown on figure 3.įigure 2: Index profile of the simulated structureĬorrect source setup representing the laser beam is as important as optimizing the grating coupler structure in order to achieve the maximum coupling efficiency. The waveguide is then covered by a 700nm thick SiO2 cladding as depicted on figure 2. The simulated SOI structure is optimized for maximum coupling efficiency at 1310nm and it consists of a 200nm thick Si waveguide that is placed on 700nm thick SiO2 layer. To better understand the differences between single and multi-frequency beam calculation visit this page. Furthermore, this application example demonstrates correct use and benefits of the multi-frequency beam calculation and compares the results with standard single frequency beam calculation. ![]() This 2D FDTD example shows how to obtain broadband characteristics of a grating coupler and compares the results to experimental data.
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