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Reflection Properties of Dual-Mode Filters Consisting of a Circular Array of Microring Resonators |
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| Authors: | Xueping Wang Jianhong Zhou Yameng Xu |
| Institution: | 1. Department of Optoelectronic Information Science and Technology, School of Science, Changchun University of Science and Technology, Changchun, Jilin, China;2. Department of Optical Engineering, School of Photoelectric Engineering, Changchun University of Science and Technology, Changchun, Jilin, China |
| Abstract: | A circular array consisting of an odd number of microring resonators is a dual-mode reflection filter. Based on the photonic energy band of a coupled microring resonator string and the resonant condition of the circular array, reflection characteristics of the circular array filter are discussed in detail. The parameters that influence the reflection characteristics and their effect mechanisms are demonstrated. The critical coupling phenomenon and its condition are revealed. We also show that the existence of loss in the rings can suppress split peaks and subsequently flatten the reflection spectrum to the whole pass band. Our work illuminates the application potential of a circular array of an odd number of microring resonators as an integrated photonics reflection filter. |
| Keywords: | Critical coupling microring resonators photonic band gap reflection filters resonance splitting |