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Efficient grating couplers on a thin film lithium niobate–silicon rich nitride hybrid platform

Yang Liu, Xingrui Huang, Zezheng Li, Huan Guan, Qingquan Wei, Zhongchao Fan, Weihua Han, and Zhiyong Li

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Abstract

A grating coupler on a thin film $x$-cut lithium niobate–silicon rich nitride hybrid platform is proposed and demonstrated. An inverse taper is applied to suppress higher-order mode excitation. A coupling efficiency of ${-}{5.82}\;{\rm{dB}}$ and 3 dB bandwidth of 57 nm are obtained near the wavelength of 1550 nm between the standard single-mode fiber (SMF-28) and sub-micrometer waveguides.

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