We propose a novel microring resonator concept which uses a polarization rotating asymmetrical directional coupler. The quasi-TE polarized mode in the bus waveguide is used to excite the quasi-TM polarized mode in the microring. This enables the realization of microrings with a high quality factor due to the lower scattering loss of the quasi-TM polarized mode. We demonstrate the operation principle with two all-pass
microrings with radius 30 ìm, working in the critically coupled regime with a quality factor of 31000 and in the under-coupled regime with a quality factor of 125000.
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