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We have reported comparatively the influences of square- and triangular corrugations on the optical waveguide to be used as optical filter. To do this, the performance parameters, reflectance and transmittance have been derived for the two types of periodic corrugated waveguides. By visualizing reflectance and transmittance characteristics, it is found that both types of corrugated optical waveguide act as optical filter. It is also found that triangular corrugated filter gives betterdoi:10.5281/zenodo.4415333 fatcat:xorkje3pcbadnbkpu6wevjucwy