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

• DOI: 10.1364/ol.413246
• Publication Date: 2020-11-30T15:35:10Z
• Authors: Yang Liu; Xingrui Huang; Zezheng Li; Huan Guan; Qingquan Wei; Zhongchao Fan; Weihua Han; Zhiyong Li
• Keywords: 0103 physical sciences; 01 natural sciences

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

d B

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.