基于倾斜罗兰圆结构的偏振无关硅纳米线阵列波导光栅的研究

项目名称： 基于倾斜罗兰圆结构的偏振无关硅纳米线阵列波导光栅的研究

项目编号： No.61205029

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 郎婷婷

作者单位： 中国计量学院

项目金额： 27万元

中文摘要： 阵列波导光栅（AWG）是光互连、无源光网络等光通信系统中的核心器件之一。硅纳米线光波导对模场的强限制为器件小型化和高密度集成提供便利，但高折射率差会引起很大的结构双折射，使器件偏振敏感。硅纳米线AWG的偏振敏感性不光表现在中心信道波长漂移，还会引起信道波长间隔的较大变化，对光通信系统有严重影响，劣化传输信号，增大误码率。本项目将研究基于硅纳米线光波导的AWG偏振敏感性机理，分析平板波导区和阵列波导区的双折射差异，在平板波导区采用创新的倾斜罗兰圆结构，选择上包层材料，设计TE和TM偏振模式的衍射级次，使硅纳米线AWG所有波长信道的偏振色散同时得到均匀补偿。该技术无需额外元件，不增加器件尺寸，具有制作简单、成本低且与平面光波导器件制作工艺完全兼容等优点。本项目将在原创思想的基础上建立准确可靠的理论模型，设计优化器件结构，实现所有波长信道均偏振无关的硅纳米线AWG。

中文关键词： 光互连；波分复用；偏振不敏感；阵列波导光栅；

英文摘要： A silicon nanowire waveguide based arrayed waveguide grating (AWG) is a key component for realizing on-chip wavelength selective functions in future high-capacity interchip optical interconnect systems. Because of its large refracitve index difference between Silicon and Silica, the silicon wire waveguide will enable optical circuits that are significantly smaller and have high integration density. However, owing to the large geometrical birefringence in silicon nanowire waveguides, a large polarization dependent wavelength shif occurs in the spectral response of each output channel.This problem is a major road block for realizing practical applications of nanowire AWGs. In this project, we propose a novel design of polarization dispersion compensated AWGs based on Si nanowires. Angled star couplers with an appropriate material as the upper-cladding, in combination with different diffraction orders for TE and TM polarizations are used to achieve uniform polarization compensation for all output channels.This method can achieve a much batter channel uniformity in the polarization dispersion compensation over previously reported techniques. This method does not require extra element, has the advantage of fabrication simplicity and low cost.Based on this novel idea, this project will build an accurate simulation mod

英文关键词： Optical interconnect；Wavelength division multiplexing；polarization insensitive；arrayed waveguide grating；