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首页> 外文期刊>Optical and quantum electronics >Low polarization dependence for evanescently coupled avalanche photodiodes: theoretical analysis and design
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Low polarization dependence for evanescently coupled avalanche photodiodes: theoretical analysis and design

机译：van逝耦合雪崩光电二极管的低偏振依赖性：理论分析和设计

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摘要

In this report, we study the difference of propagation conditions for different polarized modes in evanescently coupled waveguides. We propose a factor, the sum of squared deviations of indexes ratios, to describe the difference of propagation conditions between transverse-electric mode and transverse-magnetic mode. A simple and intuitive method based on above theoretical analysis is presented that can be used to design evanescently coupled avalanche photodiodes (ECAPDs) with low polarization dependence. We also propose a structure of ECAPDs that air slots are introduced into the matching layer. This improved structure can reduce the polarization dependence and achieve efficient coupling with a short coupling length. Our approach is compared to the other methods, such as mode analysis and beam propagation method. Agreement between predicted values and calculated results with other methods confirms the feasibility of our approach in the accurate design of polarization insensitive ECAPDs. The polarization dependence is reduced to 0.2 dB and coupling efficiency above 80 % is achieved for both polarized modes with an absorption length as short as 15μm.
机译：在这份报告中，我们研究了van逝耦合波导中不同极化模式的传播条件的差异。我们提出一个因子，即指标比率的平方偏差之和，以描述横向电模和横向磁模之间的传播条件差异。提出了一种基于上述理论分析的简单直观的方法，可用于设计偏振依赖性低的e逝耦合雪崩光电二极管（ECAPD）。我们还提出了将空位引入匹配层的ECAPD的结构。这种改进的结构可以减少偏振依赖性，并以短的耦合长度实现有效的耦合。我们的方法与其他方法进行了比较，例如模式分析和光束传播方法。预测值和计算结果与其他方法之间的一致性证明了我们的方法在极化不敏感ECAPD的准确设计中的可行性。两种偏振模式的偏振依赖性降低到0.2 dB，并且吸收长度短至15μm时，耦合效率均达到80％以上。

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  • 来源
    《Optical and quantum electronics》 |2015年第8期|2407-2422|共16页
  • 作者

    Jing Gao; Ji Zhang; Yanli Zhao;

  • 作者单位

    Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China;

    Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China;

    Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Avalanche photodiodes; Waveguides; Evanescent wave coupling; Optical polarization;

    机译：雪崩光电二极管;波导;逝波耦合;光偏振;

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