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We demonstrate monolithically defined grating couplers in $Z$-cut lithiumniobate on insulator for efficient vertical coupling between an optical fiberand a single mode waveguide. The grating couplers exhibit $\sim 44.6\%$/couplerand $\sim 19.4\%$/coupler coupling efficiency for TE and TM polarized lightrespectively. Taperless grating couplers are investigated to realize a morecompact design.

High coupling efficiency grating couplers on lithium niobate on insulator