Department of Optics and Photonics, National Central University, 32001 Jhongli, Taiwan.
Optical Sciences Center, National Central University, 32001 Jhongli, Taiwan.
Sci Rep. 2015 May 20;5:10078. doi: 10.1038/srep10078.
In this work, we study the performances of ring resonators of different type by analyzing the bending loss and the condition of the critical coupling. We propose that the bending loss of microring can be reduced by wrapping a concentrically curved waveguide. The difference of propagation constant between two concentrically curved waveguides can be tuned by adjusting the bus waveguide width to optimize the critical coupling. Furthermore, we propose to enlarge the difference of the propagation constant between two concentrically curved waveguides to maintain the circulating light in the ring to obtain higher quality factor. In this study, the highest quality factor that we measured is 7 × 10(5).
在这项工作中，我们通过分析弯曲损耗和临界耦合条件来研究不同类型的环形谐振器的性能。我们提出，通过缠绕同心弯曲波导可以降低微环的弯曲损耗。通过调整总线波导的宽度来调整两个同心弯曲波导之间的传播常数的差异，可以优化临界耦合。此外，我们建议扩大两个同心弯曲波导之间的传播常数的差异，以保持环中的循环光，从而获得更高的品质因数。在这项研究中，我们测量到的最高品质因数为 7×10(5)。
