High coupling efficiency grating couplers on lithium niobate on insulator.

  title={High coupling efficiency grating couplers on lithium niobate on insulator.},
  author={Inna Krasnokutska and Robert J. Chapman and Jean-Luc Tambasco and Alberto Peruzzo},
  journal={Optics express},
  volume={27 13},
We demonstrate monolithically defined grating couplers in Z-cut lithium niobate on insulator for efficient vertical coupling between an optical fiber and a single mode waveguide. The grating couplers exhibit ∼ 44.6%/coupler and ∼ 19.4%/coupler coupling efficiency for TE and TM polarized light respectively. Taperless grating couplers are investigated to realize a more compact design. 

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