Grating assisted optical waveguide coupler to excite individual modes of a multi-mode waveguide
Grating assisted optical waveguide coupler to excite individual modes of a multi-mode waveguide
复制标题
DOI：
10.1016/j.optcom.2015.08.050
复制
发表时间：
2015-12-01
影响因子：
2.4
通讯作者：
Roth, B.
中科院分区：
文献类型：
--
作者：
Bremer, K.;Lochmann, S.;Roth, B.
为了克服单模（SM）波导在数据传输技术中的容量限制，目前正在探索多模（MM）波导中的模分复用（MDM）形式的空分复用（SDM）。本文提出了一种新的模式选择光波导耦合器的方法，用于对MM波导的各个模式进行复用和解复用。讨论了一种光栅辅助选模光波导耦合器，并对其耦合效率进行了数值计算。该方法依赖于SM波导中的光栅结构，该SM波导用于经由倏逝场耦合来激发相邻的未修改的MM波导的各个模式。仿真结果表明，通过采用这种光栅结构并调整光栅周期，可以将单模波导中的光选择性地耦合到MM波导的基模或任意高阶模中，且耦合效率高，对相邻模通道的串扰小。结果表明，光栅辅助波导耦合器的方法在未来的应用在片上光子网络和（解）复用的MM波导的各个模式的潜力。(C)2015 Elsevier B.V.版权所有。
Spatial division multiplexing (SDM) in the form of mode division multiplexing (MDM) in multi-mode (MM) waveguides is currently explored to overcome the capacity limitation of single-mode (SM) waveguides in data transmission technology. In this work a new approach towards mode selective optical waveguide couplers to multiplex and demultiplex individual modes of MM waveguides is presented. We discuss a grating assisted mode selective optical waveguide coupler and evaluate numerically its coupling efficiency. The approach relies on a grating structure in a SM waveguide which is used to excite individual modes of an adjacent unmodified MM waveguide via evanescent field coupling. The simulations verify that by using the grating structure and tailoring the grating period, light from the SM waveguide can be coupled selectively into the fundamental mode or any higher-order mode of a MM waveguide with high efficiency and low crosstalk to adjacent mode-channels. The results indicate the potential of the grating assisted waveguide coupler approach for future applications in on-chip photonic networks and the (de)multiplexing of individual modes of MM waveguides. (C) 2015 Elsevier B.V. All rights reserved.