X-切薄膜铌酸锂高效率光栅耦合器的设计

Design of High Efficiency Grating Coupler on X-Cut Thin-Film Lithium Niobate

摘要:

基于X-切绝缘体上薄膜铌酸锂平台,提出并设计了一种高耦合效率的切趾一维光栅耦合器。采用非晶硅覆盖层材料,结合亚波长光子晶体等效方案和遗传算法增强光栅耦合效率。在中心波长1550nm处,光栅的峰值耦合效率为-1.08dB,通过引入底部金属反射镜可进一步提高至-0.53dB,其1dB带宽约为61nm。

Abstract:

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.