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- W2603943428 abstract "Computational Methods: We calculate the propagation of signal in two directions and compare the electric field profiles. The observed difference for the two cases allows for estimation of the mode mismatch between the coupled and scattered modes. Based on this comparison, we are able to calculate both the losses and coupled power. The losses originate from the mode mismatch between the signal scattered by grating and a fundamental fiber mode. We show that they can be minimized by implementing the proper profile into the grating. The simulations were performed by FD and BM analysis of COMSOL RF module. We used two excitation schemes: one with the power entering through the waveguide and another with an incident beam irradiating the grating (the beam was supposed to arrive from an optical fiber). In the fiber excitation scheme, the incident light was launched from the white rectangle, as shown in Fig. 4. The electric field profile was set to be Gaussian along the rectangle front side inducing a Gaussian beam (Fig. 4.) through the grating center. The coupled and scattered powers were calculated through the power flow integration over the model internal boundaries. The undesirable reflections from the model boundaries were suppressed by self constructed absorbing layer with the linearly increasing imaginary part of refractive index. The mesh density was adjusted to be dense near the grating and sparse in distant areas. In the absorbing layer, numerical reflections were minimized by using a mapped mesh. Matlab LiveLink TM was used to optimize the grating geometry in a semi-automated fashion. The code performed flipping of the geometry, stored electric field distributions, specified by unique ID string." @default.
- W2603943428 created "2017-04-07" @default.
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- W2603943428 date "2013-01-01" @default.
- W2603943428 modified "2023-09-24" @default.
- W2603943428 title "Simulation of Light Coupling Reciprocity for a Photonic Grating" @default.
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