Enhanced resonances by waveguide wrapping of a bulbed microring resonator

A high -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 -factor increment ( =828) compared to a standard circle MRR ( =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 -factor ( =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 -factors at lower wavelengths.