Optimization of Pulley-Type Ring Resonator with Waveguide Offset

Meng-Hua Yen; Pei-Yu Feng; Chu-En Lin; Chii-Chang Chen; Jenq-Yang Chang

doi:10.3390/mi9050226

Optimization of Pulley-Type Ring Resonator with Waveguide Offset

Micromachines (Basel). 2018 May 10;9(5):226. doi: 10.3390/mi9050226.

Authors

Meng-Hua Yen¹, Pei-Yu Feng², Chu-En Lin³, Chii-Chang Chen⁴, Jenq-Yang Chang⁵

Affiliations

¹ Department of Mechanical Engineering, National Chin-Yi University of Technology, Taichung 411, Taiwan. emh1989@mail.ncut.edu.tw.
² Department of Optics and Photonics, National Central University, Taoyuan 320, Taiwan. 102226020@cc.ncu.edu.tw.
³ Department of Mechanical Engineering, National Chin-Yi University of Technology, Taichung 411, Taiwan. celin@ncut.edu.tw.
⁴ Department of Optics and Photonics, National Central University, Taoyuan 320, Taiwan. trich@dop.ncu.edu.tw.
⁵ Department of Optics and Photonics, National Central University, Taoyuan 320, Taiwan. jychang@dop.ncu.edu.tw.

Abstract

In this work, we dealt with the optimization of the pulley-type ring resonator using the offset of the straight input and output waveguide at the junction with the curved waveguide. We adopted the finite-difference time-domain method to simulate the structure. It was found that the coupling loss could be significantly reduced and the critical coupling could be precisely tuned. This results in the possibility of the Q-factor being higher than that of the structure without waveguide offset. In this study, the Q-factor of the ring resonator is increased from 9180 to 11,302. The corresponding enhancement is 23.1%.

Keywords: Q-factor; ring resonators; waveguide offset.