Exploiting Spatial Dimensions in Multimode Fiber Using Adaptive Optical Signal Processing

综合、混合和复杂系统斯坦福大学利用自适应光信号处理技术开发多模光纤的空间维度智力优势：多模光纤（MMF）受模态色散的影响，限制了比特率和传输距离。对单模光纤的研究远远超过了对MMF的研究，因此我们对单模光纤的传播和色散的理解要比MMF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，但其在光通信系统中的潜力尚未得到充分开发。斯坦福大学的研究人员将利用为SMF开发的概念来推进对MMF传播和分散的理解。他们将使用自适应光信号处理来增强MMF的传输能力。研究将在三个主要方面整合分析、模拟和实验：(i)发展对多模传播和模态色散的基本理解；（ii）减轻单通道系统中的模态色散；（三）减缓多通道系统中的模态色散。分析和实验将解决模分多路复用（MDM）中波分多路复用（WDM）的基本和实际限制。MDM和其他多输入多输出（MIMO）传输方案尚未发挥其潜力。分析和模拟将讨论MDM，特别是如何实现模态多路复用器和解路复用器，它们必须是自适应的。更广泛的影响：该项目将使新的和以前安装的多模光纤基础设施的传输容量显著增加，有利于研究、教育、医疗保健、商业和国土安全。多模光纤和波导的新应用可能会受到启发，补充单模介质。研究生将获得研究经验。首席研究员将继续致力于教育来自不同背景的学生，并培养未来的教育工作者。他还将继续将研究与课程紧密结合。他将继续强调及时在期刊和会议上传播结果。

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.