Abstract
We report a silicon-waveguide-type polarization rotation Bragg grating with high diffraction efficiency to be used in a wavelength filter. An antisymmetric grating structure formed on the top surface of the waveguide with a terrace is used to generate polarization rotation Bragg diffraction. The finite difference time domain method is used to simulate the device. We found that introducing a side terrace of 25 to 75 nm can attain a high diffraction efficiency. The diffraction efficiency can be more than 20% larger when using this structure. A 300-nm-thick waveguide used in foundries is beneficial for fabricating a device showing large diffraction and main-subpeak separation.
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