High Q-factor microring resonator wrapped by the curved waveguide

Dong Po Cai, Jyun Hong Lu, Chii Chang Chen, Chien Chieh Lee, Chu En Lin, Ta Jen Yen

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

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.

Original languageEnglish
Article number10078
JournalScientific Reports
Volume5
DOIs
StatePublished - 20 May 2015

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