Quality Analysis of a Photonic Micro-ring Resonator

In this paper, we analyzed the resonance behavior of a silicon photonic micro-ring resonator. Photonic micro-ring resonator is a very important device for implementing photonic computation and communication circuitry. The resonance property of the ring-resonator is the key factor to use it in silicon photonic technology. To design a photonic circuit and system using ring resonator, we must have clear knowledge on the resonance behavior of the ring resonator. We investigated the ring resonator characteristics for the ring size between 1 um to 20 um and the waveguide material group index between 2 to 4. It is seen that the ring size and index have significant impact on the quality of the device. For a ring resonator of 1 um radius, the Q-factor is about 100, whereas the Q-factor is 1500 for a ring resonator with 20 um radius with index of 2.