Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 12, Issue 4, Pages 398-400Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/68.839031
Keywords
microresonators; optical waveguide filters
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Microresonator filters reported so far have been ah-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 degrees with 0.5-dB loss, The second is a ring whose toss exactly matches the coupling to the input/output waveguide with an extinction greater than 20 dB.
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