On the design of microring resonator devices for switching applications in flexible-grid networks

The physical characteristics of microring resonator switching devices are thoroughly analyzed using a model based on the field coupling matrix theory. The spectral response and insertion loss properties of these switching elements are simulated using the developed model. Results show that by cascading three microring resonators it is possible to achieve flat-top passband widths ranging from 6.25 GHz to 3 THz, while having insertion losses compatible with the use in flexible-grid optical communication networks. In light of a potential use of these devices in the design of a scalable flexible wavelength selective switch, the architecture of simple optical switches with limited functionalities is discussed.