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Waveguide-coupled octagonal microdisk channel add–drop filters

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Abstract

We report planar waveguide-coupled octagonal microdisk channel add–drop filters on silicon nitride-on-silica substrates. Using ray optics, we show that discrete octagonal cavities have wave-front-matched four- and eight-bounce ray orbits. From a planar waveguide-coupled 50µm-sized octagonal microdisk filter, our experiment demonstrates TM-polarized eight-bounce modes with a coupling efficiency of 56%, Q1150, and a finesse of 5. Using the two-dimensional finite-difference time-domain method, we obtain qualitative agreement between measurement and simulation of a smaller-sized waveguide-coupled octagonal microdisk filter.

© 2004 Optical Society of America

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