Semiconductor Optoelectronics, Volume. 43, Issue 2, 280(2022)
Design of High Efficiency Grating Coupler on X-Cut Thin-Film Lithium Niobate
Proposed and designed is a high coupling efficiency apodized one-dimensional grating coupler based on X-cut lithium niobate insulator platform. The overlay amorphous silicon is employed to enhance the coupling efficiency by combing subwavelength photonic crystal design and genetic algorithm. The optimized grating coupler exhibits a peak coupling efficiency of -1.08dB, which can be further improved up to -0.53dB by introducing a bottom metal mirror, with a 1dB bandwidth of 61nm at central wavelength of 1550nm.
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LUO Yannong, CAI Xinlun. Design of High Efficiency Grating Coupler on X-Cut Thin-Film Lithium Niobate[J]. Semiconductor Optoelectronics, 2022, 43(2): 280
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Received: Mar. 7, 2022
Accepted: --
Published Online: Jul. 21, 2022
The Author Email: Xinlun CAI (caixlun@mail.sysu.edu.cn)