Enhanced axial confinement in a monolithically integrated self-rolled-up SiNx vertical microring photonic coupler

Xin Yu, Lynford L. Goddard, Xiuling Li, Xiaogang Chen

Research output: Contribution to journalArticlepeer-review


We report an efficient method to introduce enhanced axial confinement in the self-rolled-up SiNx vertical microtube coupler by depositing a thin layer of high refractive index material strip within the coupling section and effectively forming a vertical microring. Three times wider mode spacing is observed in such a vertical microring coupler monolithically integrated with a silicon nitride ridge waveguide as compared to the one without such axial confinement. More importantly, single mode operation within the telecomm C-band and S-band is achieved.

Original languageEnglish (US)
Article number111104
JournalApplied Physics Letters
Issue number11
StatePublished - Sep 12 2016

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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