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【Technical articles】Design Optimization of Grating Fiber Couplers With RSoft Products

2018.07

Optimization of the Apodized Grating
In silicon photonics, grating couplers (GCs) are essential for coupling light between optical fibers and silicon waveguides. To reduce insertion loss and achieve efficient coupling, significant effort has been made in the past, such as the inclusion of reflecting mirrors under the buried oxide (BOX) layer to stop leakage into the silicon substrate, as well as the use of apodized gratings to better match the coupled light with the fiber modal profile. The best result achieved to date is 0.58dB coupling loss, which was obtained by carefully engineering sub-wavelength photonic bandgap structures to provide the necessary refractive indices for optimum coupling [1].
 
With the help of Synopsys RSoft™ photonic simulation tools, complex device designs can be easily achieved by starting with simple design rules. For GCs, a simple design rule can be extracted directly from geometric optics as shown in Figure 1.
 
Figure 1. Schematic diagram of the coupler and phase matching condition
 
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RSoft-Grating-Coupler-Design-Optimization.pdf

RSoft-Grating-Coupler-Design-Optimization
2018-07-23 16:37:00
2018-07-23 16:37:00
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