Nested-ring Mach–Zehnder interferometer

Abstract

We propose for the first time, a newly configured device based on nested-ring Mach-Zehnder interferometer structure (NRMZI). The device is capable of generating a box-shaped spectral response approaching an ideal filter due to the double-Fano resonances that arise from multiple interference within the nested-ring as well as that within the MZI. It may be considered as the integrated-optic analog of a reflection or diffraction grating, and as with grating, can be used efficiently as a filter, sensor, or switch at the appropriate operating wavelengths.