A topology-optimized L-taper with input and output waveguides rotated 90 degrees converts a 0.5 micron waveguide to a 12 micron waveguide with -0.38 dB simulated transmission in a 16 by 6 micron footprint.
Grating couplers on silicon photonics: Design principles, emerging trends and practical issues,
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Inverse-Designed Tapers for Compact Conversion Between Single-Mode and Wide Waveguides
A topology-optimized L-taper with input and output waveguides rotated 90 degrees converts a 0.5 micron waveguide to a 12 micron waveguide with -0.38 dB simulated transmission in a 16 by 6 micron footprint.