CAREER: Optimizing Fiber-Optic Communication Systems Through Analytical Modeling of Linear and Nonlinear Signal Degradations

职业：通过线性和非线性信号衰减的分析建模优化光纤通信系统

• 批准号: 9703347
• 负责人: Maite Brandt-Pearce
• 金额: $ 21.85万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-06-01 至 2001-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9703347&HistoricalAwards=false
• 关键词: CAREER; Optimizing; Fiber; Optic; Communication

This research pursues the design and analysis of multiuser optical communication systems to increase the performance, distance, and capacity of existing and future systems. The focus is on the physical layer - i.e., the actual single fiber links that connect the nodes of large. The intense demand for more data, voice, and video in and out of every home and office has led to multiuser systems that are typically broadband and high power, sometimes leading to severe linear and nonlinear degradation in the signal due to properties inherent to the fiber. Mastering these physical limitations can translate into a hundred to thousand fold increase in capacity of existing infrastructure, with a potential savings of billions of dollars. The goal of this research project is to identify, characterize, and combat signal degradation in fibers, and to use this information to design the highest capacity multiuser systems. While the physical properties of fibers have been broadly measured and defined, the proper design of fiber systems to optimize signal properties for communications has not been fully considered. A tool has been developed that provides a method of obtaining an analytical closed-form solution of a nonlinear differential equation describing the propagation of optical signals through silica fiber. The result is a Volterra model for the fiber which can be used to both quantify the signal degradation due to the fiber and to design algorithms and devices to combat this effect. The model will be used to analyze the performance of optical TDMA, CDMA, and WDMA networks including realistic distortions such as intermodulation products, intersymbol interference, and multiple user interference. This same model will then be used to define signal processing algorithms and corresponding nonlinear devices to combat signal degradation. The possibility of creating a communication system that uses the soliton waveform in multiuser systems will be studied. Solitons are hi ghly desirable in that they take advantage of the nonlinear fiber effects to cancel pulse dispersion caused by linear effects. Finally, effects such as nonlinear polarization on coherent light communication systems will be analyzed using a modification of our Volterra model. The education portion of this study includes three new courses for improving the instruction of undergraduates and graduates in optical communications and multiuser communication at the University of Virginia. Two courses emphasize development of the optical communication system from the ground up (without relying on the usual RF analog), followed by a third course in multiuser communication, tied directly to this and related research. The primary goal of an educational institution to prepare the new generations for tomorrow can be accomplished only if the institution responds to the needs of the current and future students. One important aspect of this goal is to respond to the increased interest of women in the field of engineering. Following her hypothesis that women are socialized to find importance in issues of human and social concern, this researcher will be active in modifying the current methods of teaching engineering to show the link between technical methodology and the resulting products and services. Students will be encouraged to work within well defined groups that echo the work place environment. Being a female in a field that is in transition from being male dominated carries the responsibility of being a role model. Female engineering students will be especially encouraged to participate in a mentoring program instituted to promote success, a sense of belonging and strong self esteem. World-Wide Web Link: http://watt.seas.Virginia.EDU/~mb9q/

本研究追求多用户光通信系统的设计和分析，以提高现有和未来系统的性能，距离和容量。 重点是物理层-即，连接大型节点的实际单光纤链路。 每个家庭和办公室对更多数据、语音和视频的强烈需求导致了通常为宽带和高功率的多用户系统，有时由于光纤固有的特性导致信号中严重的线性和非线性退化。 掌握这些物理限制可以转化为现有基础设施容量的百倍至千倍增长，并可能节省数十亿美元。 该研究项目的目标是识别、表征和对抗光纤中的信号退化，并利用这些信息来设计最高容量的多用户系统。 虽然光纤的物理特性已经被广泛地测量和定义，但尚未充分考虑光纤系统的适当设计以优化通信的信号特性。 已经开发了一种工具，该工具提供了一种获得描述光信号通过石英光纤的传播的非线性微分方程的解析封闭形式解的方法。 结果是光纤的沃尔泰拉模型，其可用于量化由于光纤引起的信号退化，并设计算法和设备来对抗这种效应。 该模型将用于分析光TDMA，CDMA和WDMA网络的性能，包括实际的失真，如互调产物，符号间干扰，多用户干扰。 然后，将使用相同的模型来定义信号处理算法和相应的非线性设备，以对抗信号退化。 将研究在多用户系统中创建使用孤子波形的通信系统的可能性。 孤子是利用光纤的非线性效应来抵消线性效应引起的脉冲色散的理想光孤子。最后，将使用我们的沃尔泰拉模型的修改，如相干光通信系统的非线性偏振的影响进行分析。 本研究的教育部分包括三个新的课程，以提高本科生和研究生在光通信和多用户通信在弗吉尼亚大学的教学。 两门课程强调光通信系统的从头开始的发展（不依赖于通常的RF模拟），其次是多用户通信的第三门课程，直接与此相关的研究。 一个教育机构的首要目标是为明天的新一代做好准备，只有当该机构对当前和未来学生的需求做出反应时，才能实现这一目标。 这一目标的一个重要方面是应对妇女对工程领域日益增长的兴趣。 根据她的假设，即妇女社会化，发现在人类和社会关注的问题的重要性，这位研究人员将积极修改目前的教学方法工程，以显示技术方法和由此产生的产品和服务之间的联系。学生将被鼓励在明确定义的小组内工作，以反映工作场所的环境。 在一个由男性主导的领域中，作为一名女性，有责任成为一个榜样。 将特别鼓励工科女学生参加一个旨在促进成功、归属感和强烈自尊的辅导方案。 万维网链接：http://watt.seas.Virginia.EDU/~mb9q/