Advanced Multi-functional Photonic Filters Based on Integrated Sagnac Interferometers

As a fundamental optical approach to interferometry, Sagnac interference has been widely used for reflection manipulation, precision measurements, and spectral engineering in optical systems. This thesis presents advanced multi-functional integrated photonic devices formed by Sagnac interferometers, opening up a new avenue towards realizing various filter functions based on integrated waveguide-coupled resonators and shows new perspectives for realizing optical analogues of quantum physics by exploiting Sagnac interference in integrated photonic devices, which could provide competitive benefits including compact footprint, high scalability, high stability, and mass producibility for practical applications.