Multiple Optical Ring Resonators for Free Spectral Range Squeezing

Optical ring resonators are an integral component of large-scale photonic circuits having the potential to be used in ultrafast data communication and numerous sensing application. Ring resonator coupled to a bus waveguide has the ability to function as spectral filter, temperature sensor, biosensor etc. where multiple rings are promising to enhance the capabilities and performance in order to apply its functionalities for Dense WDM and Sensing applications. However, matching the resonant wavelength in multiple ring resonator case is still challenging to optimize. Consequently, it is essential to precisely design and analyze ring resonators’ structural characteristics to have a thorough understanding of the features that could operate as the controlling factors. Therefore, in this study, the design criteria and the feedback of a double micro ring resonator (DMRR) has been analyzed by 2D Finite Element Method. We demonstrate that both rings are simultaneously resonant, at 1550 nm which is the telecommunication wavelength, with the analysis of a double MRR simulation performed using COMSOL Multiphysics.