光通信研究, 2018 (3): 43, 网络出版: 2018-07-30  

零对比度光栅平面外慢光滤波器设计与分析

Design and Analysis of the Out-of-plane Slow Light Filter with Zero Contrast Grating
李俊浪 1,2桑田 1,2周健宇 1,2王睿 1,2
作者单位
1 江南大学 a. 理学院 光电信息科学与工程系
2 b. 江苏省轻工光电工程技术研究中心,江苏 无锡 214122
摘要
慢光在未来全光网络通信中具有重要作用。文章提出一种基于零对比度光栅共振诱导透明效应的可实现平面外慢光滤波的设计,该设计兼具优良的透射滤波功能和慢光效应。分析了刻蚀深度和光栅周期对慢光滤波性能的影响,指出刻蚀深度影响波导层对共振诱导模式的束缚,刻蚀深度的改变将显著降低零对比度光栅的慢光滤波性能;而光栅周期主要影响入射光与波导模的相位匹配,选取不同光栅周期可在C波段实现对不同慢光滤波通道的选择。此外,研究了斜入射条件的模式劈裂效应,指出由于斜入射条件下非简并共振波导模的激发,±1级劈裂模式被激发,其虽然导致峰值透射的降低,但可以显著提高透射慢光的群折射率。该研究为慢光器件的设计提供了一种新的解决方案。
Abstract
Slow light will play an important role for all optical network communication in the future. A design of out-of-plane slow light filter based on resonance induced transparency of zero contrast grating is proposed, which combines excellent transmission filtering function and slow light effect. The influences of etch depth and grating period on the slow light filtering performance is analyzed. It is noted that the change of the etching depth can significantly reduce the slow light filtering performance of the zero contrast grating due to the influence of the etching depth on the resonance mode constrained within the waveguide layer. However, the grating period mainly affects the phase matching between the incident light and the waveguide mode. Different grating periods can be used to select the different slow light filtering channels in the C band. In addition, the mode splitting effect of the oblique incidence condition is studied, and it is noted that the excitation of the non-degenerate resonant waveguide under the oblique incident condition leads to smaller the peak transmission an larger group refraction index. This research provides a new solution for the design of slow light devices.

李俊浪, 桑田, 周健宇, 王睿. 零对比度光栅平面外慢光滤波器设计与分析[J]. 光通信研究, 2018, 44(3): 43. LI Jun-lang, SANG Tian, ZHOU Jian-yu, WANG Rui. Design and Analysis of the Out-of-plane Slow Light Filter with Zero Contrast Grating[J]. Study On Optical Communications, 2018, 44(3): 43.

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