Transmission Properties of a 3x3 Cross-Coupled Double-Ring Resonator-based Photonic Integrated Circuit (PIC) Filter

Abstract

We propose a novel Photonic Integrated Circuit (PIC)-based configuration for a double-ring resonator (DRR) that incorporates both (i) 3x3 coupler and (ii) cross-coupling directional coupler (DC) to increase its performance as a photonic filter. It is compared to a standard 3x3 DRR and its transmission properties were analyzed. We also investigated the effects of varying the two coupling parameters (k_r and k_x) on the transmission properties. The results show that the internal cross-coupling DC (k_x) significantly enhances the filter’s capability through selection of appropriate coupling parameters.