Lithium niobate (LN) devices have been used in optical communication and nonlinear optics widely due to its impressive optical properties. Thin-film lithium niobate on insulator (LNOI) improves performances of LN-based devices further. But a high-efficient fiber-chip optical coupler for the LNOI-based devices for practical applications is still absent. In this article, we demonstrate a wide-band, highly efficient and polarization independent edge coupler based on LNOI fabricated by planar semiconductor process. The measured ultra-high numerical aperture fiber (UHNAF)-to-chip optical coupling loss at 1550 nm is 0.54 dB/facet (0.59 dB/facet) for TE(TM). The coupler has the coupling loss lower than 1dB/facet for both TE and TM light at wavelengths longer than 1527nm.
Here we demonstrated a single polarization waveguide and spot size converter for edge coupling working at O band based on Lithium niobate on insulator.The improvement extinction ratio of 35dB/cm is obtained for the single polarization waveguides. The insertion loss of bilayer spot size converters is 3.5dB/facet from our best results at the light length of 1310nm.
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