Compact microring notch filters |
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| Authors: | Absil P.P. Hryniewicz J.V. Little B.E. Wilson R.A. Joneckis L.G. Ho P.-T. |
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| Affiliation: | Lab. for Phys. Sci., College Park, MD; |
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| Abstract: | Microresonator filters reported so far have been all-pole-type filters. We report two experimental realizations of zero-type (notch) filters using GaAs-AlGaAs microring resonators. The first is a ring coupled to one side of a Mach-Zehnder interferometer, the Y-branch of which has an effective splitting angle of 50° with 0.5-dB loss. The second is a ring whose loss exactly matches the coupling to the input/output waveguide with an extinction greater than 20 dB |
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