光通信技术2025，Vol.49Issue(6)：15-20,6.DOI:10.13921/j.cnki.issn1002-5561.2025.06.003
可调散射范围光栅耦合器的设计与分析
Design and analysis of a tunable scattering range grating coupler
摘要
Abstract
Traditional grating couplers face the challenge of low coupling efficiency due to momentum-space mode mismatch when dealing with large-divergence-angle light sources.This study proposes a design method for a grating coupler with tunable scattering range by employing the finite-difference time-domain(FDTD)algorithm.By adjusting the scattering angle of the grat-ing units,the scattering range of the coupler can be flexibly controlled,thereby optimizing the mode field matching between the light source and the grating coupler.Simulation results demonstrate that the designed single-etch silicon nitride grating coupler without a metal reflector achieves a coupling efficiency of 63%(-2.01 dB)with an 850 nm vertical-cavity surface-emitting laser(VCSEL),significantly reducing coupling loss compared with conventional grating couplers while exhibiting low sensitivity to the incident light angle.关键词
可调散射范围/模场匹配/时域有限差分/光栅耦合器/光源异构集成Key words
tunable scattering range/modal-field matching/finite-difference time-domain/grating coupler/light source hetero-geneous integration分类
信息技术与安全科学引用本文复制引用
范源,于海华,于浩,王浩然,左易,彭超..可调散射范围光栅耦合器的设计与分析[J].光通信技术,2025,49(6):15-20,6.基金项目
国家自然科学基金项目(62325501)资助. （62325501）
