光通信技术2024，Vol.48Issue(4)：9-14,6.DOI:10.13921/j.cnki.issn1002-5561.2024.04.002
基于改进PSO算法设计的TFLN平台偏振不敏感光栅耦合器
Polarization-insensitive grating coupler designed for TFLN platform based on improved PSO algorithm
摘要
Abstract
Aming at the polarization-dependency issue of grating couplers,standard and improved polarization-insensitive grating couplers are successively designed on the thin film lithium niobate(TFLN)platform.During the design process,the particle swarm optimization(PSO)algorithm is first improved,and then the improved PSO algorithm is used to optimize the grating parameters,including critical parameters such as grating period,duty cycle,etching depth,and incident angle.Finally,a polarization-insensi-tive chirped grating coupler is designed,and the effective refractive index is adjusted through linear chirp,significantly improving the coupling efficiency and polarization-insensitive bandwidth.The simulation results show that the coupling efficiency is the highest at the wavelength of 1 544 nm,and the coupling losses of the transverse electric(TE)and transverse magnetic(TM)modes of the polarization-insensitive chirped grating coupler are-4.88 and-5.05 dB,respectively.The polarization-dependent loss(PDL)is less than 0.5 dB within the wavelength range of 1 500 nm to 1 580 nm,and the polarization-insensitive bandwidth is 45 nm.关键词
薄膜铌酸锂/偏振不敏感/光栅耦合器/啁啾/改进粒子群算法Key words
thin film lithium niobate/polarization-insensitive/grating coupler/chirp/improved particle swarm optimization algo-rithm分类
信息技术与安全科学引用本文复制引用
李坚平,邓冶,王烈,张振荣..基于改进PSO算法设计的TFLN平台偏振不敏感光栅耦合器[J].光通信技术,2024,48(4):9-14,6.基金项目
广西重点研发计划项目(桂科 AB22080048)资助. （桂科 AB22080048）
