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Lithium-Niobate-On-Insulator (LNOI) has emerged as a promising platform inthe field of integrated photonics. Nonlinear optical processes and fastelectro-optic modulation have been reported with outstanding performance inultra-low loss waveguides. In order to harness the advantages offered by theLNOI technology, suitable fiber-to-chip interconnects operating at differentwavelength ranges are demanded. Here we present easily manufacturable,self-imaging apodized grating couplers, featuring a coupling efficiency of theTE0 mode as high as $\simeq 47.1\%$ at $\lambda$=1550 nm and $\simeq 44.9\%$ at$\lambda$=775 nm. Our approach avoids the use of any metal back-reflector foran improved directivity or multi-layer structures for an enhanced gratingstrength.

Efficient self-imaging grating couplers on a Lithium-Niobate-On-Insulator platform at near-visible and telecom wavelengths