Attached is an example of how to create a grating bend. This structure group can be useful for grating rings. If you have any comments or suggestions, let me know.
SWG Bend.fsp (236.1 KB)
I think of expanding its functionality to have a more generic shape instead of rectangles as in the attached paper. Let me know if this is useful.
Engineered low loss grating waveguide.pdf (809.7 KB)