Way of designing a periodic grating coupler with fully etched slots
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摘要:
In order to couple into or out of a silicon photonic waveguide on silicon on insulator (SOI) substrate from optical fibers,we present a simple but practical method to design a grating coupler.The grating is periodic with fully etched slots;strong reflection between the fully etched grating and the waveguide is avoided by adding an antireflection interface.Theoretical coupling efficiency up to 43% is demonstrated.A taper waveguide used to link the grating and waveguide is also designed.