Exploiting Spatial Dimensions in Multimode Fiber Using Adaptive Optical Signal Processing

集成、混合和复杂系统约瑟夫·M·卡恩斯坦福大学使用自适应光学信号处理技术开发多模光纤的空间维度智能优点：多模光纤(MMF)受到模式色散的影响，限制了比特率和传输距离。对单模光纤(SMF)的研究已经远远超过了对MMF的研究，因此我们对单模光纤的传输和色散的了解比MMF要先进得多。自适应信号处理在无线和有线通信系统中是必不可少的，但它在光通信系统中的潜力几乎没有被发掘。斯坦福大学的研究人员将利用为SMF开发的概念来促进对MMF中传播和色散的理解。他们将使用自适应光信号处理来提高MMF的传输能力。这项研究将在三个主要方面进行分析、模拟和实验：(I)发展对多模传播和模式色散的基本理解；(Ii)缓解单通道系统中的模式色散；以及(Iii)缓解多通道系统中的模式色散。分析和实验将解决波分复用(WDM)在模分复用(MDM)中的基本和实际限制。MDM和其他多输入多输出(MIMO)传输方案尚未实现其潜力。分析和模拟将涉及MDM，特别是如何实施必须具有适应性的模式复用器和解复用器。广泛影响：该项目将显著提高新的和以前安装的多模光纤基础设施的传输容量，使研究、教育、医疗保健、商业和国土安全受益。多模光纤和波导的新应用可能会受到启发，作为单模介质的补充。将为研究生提供研究经验。首席调查员将继续致力于教育来自不同背景的学生，并培训未来的教育工作者。他还将继续将研究与课程工作紧密结合起来。他将继续强调在期刊和会议上及时传播成果。

Integrative, Hybrid and Complex SystemsJoseph M. KahnStanford UniversityExploiting Spatial Dimensions in Multimode Fiber Using Adaptive Optical Signal ProcessingIntellectual Merit: Multimode fiber (MMF) is subject to modal dispersion that limits bit rates and transmission distances. Research on single-mode fiber (SMF) has far outstripped work on MMF, so our understanding of propagation and dispersion is much more advanced for SMF than for MMF. Adaptive signal processing is essential in wireless and wired communication systems, yet its potential has barely been explored in optical communication systems. Researchers at Stanford University will exploit concepts developed for SMF to advance understanding of propagation and dispersion in MMF. They will use adaptive optical signal processing to enhance transmission capacity in MMF. The research will integrate analysis, simulation and experiment in three major thrusts: (i) developing a fundamental understanding of multimode propagation and modal dispersion; (ii) mitigation of modal dispersion in single-channel systems; and (iii) mitigation of modal dispersion in multi-channel systems. Analysis and experiment will address fundamental and practical limits to wavelength-division multiplexing (WDM) in mode-division multiplexing (MDM). MDM and other multi-input, multi-output (MIMO) transmission schemes have yet to realize their potential. Analysis and simulation will address MDM, particularly how to implement modal multiplexers and demultiplexers, which must be adaptive.Broader Impact:This project will enable significant increases in transmission capacity on new and previously installed multimode fiber infrastructure, benefiting research, education, healthcare, commerce, and homeland security. New applications of multimode fibers and waveguides may be inspired, complementing single-mode media. Research experience will be provided for graduate students. The principal investigator will continue his commitment to educating students from diverse backgrounds, and to training of future educators. He will also continue to integrate research closely with course work. He will continue to emphasize timely dissemination of results in journals and conferences.