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
Original Manuscript: April 19, 1977
Published: July 1, 1977
P. S. Cross and H. Kogelnik, "Sidelobe suppression in corrugated-waveguide filters," Opt. Lett. 1, 43-45 (1977)