Abstract

The reflection sidelobes of a corrugated optical waveguide filter are shown to be suppressed when the corrugation depth is tapered with a function that has low, Fourier-transform sidelobes. Several specific taper functions are considered, and sidelobe levels lower than −70 dB are shown to be feasible. A simple rule for estimating the 3-dB reflection bandwidth of a tapered corrugation is also presented.

© 1977 Optical Society of America

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