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首页> 外文学位 >Low dispersion, high spectral efficiency, RF photonic transmission systems and low loss grating couplers for silicon -on -insulator nanophotonic integrated circuits.
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Low dispersion, high spectral efficiency, RF photonic transmission systems and low loss grating couplers for silicon -on -insulator nanophotonic integrated circuits.

机译：低色散，高光谱效率，RF光子传输系统和低损耗光栅耦合器，用于绝缘体上硅纳米光子集成电路。

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摘要

There has been tremendous interest in applying the sophistication present in electrical communication to the field of fiber optic communications. This includes the area of coherent detection, which has eluded optics due to the absence of stable and noise free optical local oscillators. The first half of this dissertation discusses the design and experimental demonstration of high spectral efficiency, low dispersion transmission systems that use the strengths of electrical communication to compensate for areas in which optics is lacking. We propose a system that achieves high spectral efficiency by using microwave filtering to compensate for the slow roll-off in optical filters. We also demonstrate coherent detection without an optical local oscillator, by using microwave photonic mixing rather than all-optical mixing.;The receivers described here use high-performance modulators to perform the function of microwave photonic mixing. Adding such sophistication to optical communications circuits is currently impeded by the cost and complexity of the different optical components that currently exist in diverse material systems. In order to truly exploit the potential of optical functionalities across a broad range of applications, it is essential to realize ultra-compact multi-functional optics on a single platform. Silicon-on-Insulator (SOI) is a material system that shows great promise in this regard. Silicon is ubiquitous in the electronics industry, and processing techniques are well established. The superficial silicon of SOI presents us with a high index contrast layer in which miniaturized optics and electronics could coexist in a high density optoelectronic IC. This could lead to a hybrid photonic/electronic circuit that would be compatible with CMOS technology.;However, the high index contrast system comes with a penalty. The need for single mode optical waveguides in the silicon, requires a waveguiding layer that is 200--300 nm thick. This results in a huge mode mismatch with single mode fiber, precluding the use of simple end-fire coupling to interface the fiber with the nanophotonic chip.;The second half of this dissertation discusses the design, fabrication and characterization of a grating coupler that addresses this problem. A novel design is proposed to enhance coupling efficiency, and a proof-of-concept experiment is performed.
机译：将电通信中存在的复杂性应用于光纤通信领域引起了极大的兴趣。这包括相干检测的区域，由于缺少稳定且无噪声的光学本地振荡器，因此无法进行光学检测。本文的前半部分讨论了高光谱效率，低色散传输系统的设计和实验演示，该系统利用电通信的优势来弥补光学方面的不足。我们提出了一种系统，该系统通过使用微波滤波来补偿光学滤波器中的缓慢滚降来实现高光谱效率。我们还展示了通过使用微波光子混合而不是全光混合，无需光学本地振荡器的相干检测。此处描述的接收器使用高性能调制器来执行微波光子混合的功能。当前，由于在各种材料系统中存在的不同光学组件的成本和复杂性，阻碍了将这种复杂性添加到光学通信电路中。为了在各种应用中真正发挥光学功能的潜力，至关重要的是在一个平台上实现超紧凑型多功能光学器件。绝缘体上硅（SOI）是在这方面显示出巨大希望的材料系统。硅在电子工业中无处不在，并且处理技术已经成熟。 SOI的表层硅为我们提供了一个高折射率对比层，在该对比层中，微型光学器件和电子器件可以共存于高密度光电IC中。这可能会导致与CMOS技术兼容的光子/电子混合电路。但是，高折射率对比系统会带来损失。硅中对单模光波导的需求需要200--300 nm厚的波导层。这导致与单模光纤的巨大模式失配，从而排除了使用简单的端射耦合将光纤与纳米光子芯片连接的问题。本论文的第二部分讨论了光栅耦合器的设计，制造和表征。这个问题。提出了一种新颖的设计来提高耦合效率，并进行了概念验证实验。

著录项

  • 作者

    Narasimha, Adithyaram.;

  • 作者单位

    University of California, Los Angeles.;

  • 授予单位 University of California, Los Angeles.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 127 p.
  • 总页数 127
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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