Enhanced resonances by waveguide wrapping of a bulbed microring resonator

Abstract

A high Q -factor novel bulb design, to the best of our knowledge, inspired by the well-studied pulley microring resonator (MRR), is demonstrated and compared with circle and racetrack MRRs at wavelengths of 1.45–1.65 µm. A wrapping of 60% around the ring showed a three times Q -factor increment ( Q = 828 ) compared to a standard circle MRR ( Q = 206 ) at a telecom wavelength of 1.55 µm with a fixed ring radius of 2 µm, while further increasing the wrapping at 80% shows a decrease in its Q -factor ( Q = 454 ). A comparison of the wavelength dependence of the bulb design with other typical MRR designs suggests that bulb designs are highly sensitive to wavelength and have very high Q -factors at lower wavelengths.