Wavelength-selective reflector based on a circular array of coupled microring resonators

Abstract—We propose and analyze a novel type of wavelength-selective reflector for planar lightwave technology based on a cir-cular array of coupled microring resonators. Narrow-band reflec-tion peaks can be achieved without the need for additional complex lithography and processing steps. The ring resonators also allow for simple and wide-range tuning of the reflection peak. Index Terms—Integrated optics, microresonators, optical filters, tunable filters. I