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A grating coupler on 700-nm-thick Z-cut lithium-niobate-on-insulator platformwith high coupling efficiency, large bandwidth, and high fabrication toleranceis designed and optimized by inverse design method. The optimized gratingcoupler is fabricated with a single set of e-beam lithography and etchingprocess, and it is experimentally characterized to possess peak couplingefficiency of -3.8 dB at 1574.93 nm, 1-dB bandwidth of 71.7 nm, and 3-dBbandwidth of over 120 nm.

Inverse-designed broadband low-loss grating coupler on thick lithium-niobate-on-insulator platform