Nondestructive measurement of propagation loss and coupling efficiency in microring resonator filters using filter responses

Since the device performance of microring resonator filters is determined by the propagation loss in the ring waveguide and the coupling efficiency between the busline and the ring, a precise and nondestructive measurement method for these parameters is needed to analyze the characteristics and to improve the performance of such filters. In this study, we propose and demonstrate a nondestructive measurement method for the loss and coupling efficiency in a microring resonator by analyzing the filter responses of throughput and drop ports. The accuracy of the method and applicable range of the propagation loss and coupling efficiency are discussed.