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Design and analysis of a poled-polymer electro-optic modulator with a strip-loaded waveguide structure.

机译：带载波导结构的极化聚合物电光调制器的设计和分析。

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摘要

To fully utilize the advances of electro-optic (EO) polymer research, a detail design and model of a triple stacked poled-polymer, electro-optic waveguide modulator was developed to provide guidance in the selection of cladding layers and demonstrate how the mode conditions affect the overall device performance. Waveguide devices depend not only on the EO materials used in the core, but also on the cladding materials. In contrast to most of the research that has focused on molecular engineering of the electro-optically active materials to improve the core properties of the waveguide, this work studied the effects of cladding material properties to improve overall device performance of an electro-optic waveguide modulator. Various, commercially available polymer materials were identified and investigated for potential cladding layers according to their optical, electrical, process ability and film casting properties.;A poled-polymer, strip-loaded waveguide, EO modulator is designed and analyzed in terms of single mode conditions, optical loss due to the metal electrodes, modulation efficiency, and mode size. Two designs were compared: Design 1 optimized the half-wave voltage for a single-arm modulator ( Vpi=2.5 V) with a nearly symmetric waveguide by maximizing modulation efficiency and minimizing the overall thickness of the waveguide; Design 2 optimized the insertion loss (6 dB) with a strongly asymmetric waveguide by maximizing the overall mode size to most efficiently overlap with a single mode fiber. High frequency analysis of a microstrip electrode showed a modulator with a push-pull scheme can be fabricated with half-wave voltage ( Vpi) of 4.0 V for Design 1 and 5.1 V for Design 2 at 3 GHz.;Some general guidelines in the design of a poled-polymer electro-optic modulator incorporating a strip-loaded waveguide structure are suggested. First, the core layer thickness and ridge width supporting single mode propagation should be fabricated as large as possible by increases the asymmetry of the refractive index between the top and bottom cladding layer. Second, the thicknesses of the top and bottom cladding layers must be optimized through an analysis of the waveguide mode amplitude distribution so that the electrode-associated optical loss is minimized to a required level while simultaneously the total thickness of the waveguide is minimized. The ridge structure greatly simplifies fabrication procedures, reduces fabrication steps and eliminates propagation losses due to roughness of etched sidewalls. The results of the analysis were modeled in beam propagation software to confirm the ideal conditions for single mode propagation.
机译：为了充分利用电光（EO）聚合物研究的进展，开发了三重堆叠极化聚合物，电光波导调制器的详细设计和模型，以为包层的选择提供指导并演示模态条件影响整体设备性能。波导装置不仅取决于芯中使用的EO材料，而且还取决于包层材料。与大多数专注于电光活性材料的分子工程以改善波导核心特性的研究相反，这项工作研究了包层材料特性对改善电光波导调制器整体器件性能的影响。鉴定了各种可商购的聚合物材料，并根据其光学，电学，加工能力和薄膜流延性能对潜在的包层进行了研究。;根据单模设计并分析了极化聚合物，带载波导，EO调制器条件，由于金属电极引起的光损耗，调制效率和模式尺寸。比较了两种设计：设计1通过最大化调制效率和最小化波导的整体厚度，优化了具有近似对称波导的单臂调制器（Vpi = 2.5 V）的半波电压；设计2通过使整体模式尺寸最大化以最有效地与单模光纤重叠，从而通过强非对称波导优化了插入损耗（6 dB）。微带电极的高频分析表明，在3 GHz的频率下，设计1的半波电压（Vpi）为4.0 V，设计2的5.1 V的半波电压（Vpi）可以制造具有推挽方案的调制器;设计中的一些一般准则建议结合带状负载波导结构的极化聚合物电光调制器。首先，应通过增加顶部和底部包层之间折射率的不对称性，将支持单模传播的芯层厚度和脊宽制造得尽可能大。其次，必须通过分析波导模式振幅分布来优化顶部和底部包层的厚度，以使与电极相关的光损耗最小化至所需水平，同时使波导的总厚度最小化。脊结构极大地简化了制造过程，减少了制造步骤，并消除了由于蚀刻侧壁的粗糙度而引起的传播损失。在光束传播软件中对分析结果进行建模，以确认单模传播的理想条件。

著录项

  • 作者

    Davis, Antonio Arthur.;

  • 作者单位

    University of Dayton.;

  • 授予单位 University of Dayton.;
  • 学科 Physics Optics.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 208 p.
  • 总页数 208
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 人类学;
  • 关键词

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