Reverse Design Of Microring Resonator Channel Dropping Filters

We present a reverse solving design approach to achieve accurate control over the response shapes and resonant peak positions of channel dropping filters implemented by coupled microring resonators. From performance to geometry, we obtain the geometric parameters based on the layout connecting multiple cells consisting of two straight waveguides and one microring in series to achieve the desired filter performance. We discuss the theoretical limit that the filters can reach and how to obtain the geometric parameters corresponding to the desired response reversely. Finally, the numerical simulations are carried out, and the results agree well with theoretical analysis, verifying the efficacy of our approach.