Modulation strategies and phase noise mitigation for spectrally efficient optical coherent communications

频谱效率高的光相干通信的调制策略和相位噪声抑制

• 批准号: 170405-2013
• 负责人: Rusch, LeslieAnn
• 金额: $ 4.44万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=569578
• 关键词: Modulation; strategies; phase; noise; mitigation

The optical fiber provides an extremely low attenuation, high bandwidth (terahertz) communications media and is the backbone of modern communications networks. The cost per bit of communications has fallen exponentially over past decades, however we are quickly approaching the capacity limits via exploitation of wavelength division multiplexing with coherent detection and higher order modulation. The increasing level of data manipulations in data centres and in local networks, nonetheless, continues to push demand for greater information density on fibers. This proposal applies experimentation, modeling and numerical techniques to research into new modulation strategies in the context of coherent detection systems. The focus will be on spatial multiplexing in fiber with the concomitant cross modal interference and phase noise enhancement. Spatial multiplexing attempts to create new communications channels in the same optical media by exploiting quasi orthogonal channels - quasi because physical imperfections in materials and devices destroy the theoretical orthogonality. Critical analysis of the fiber and multiplexer induced modal correlations must be examined to determine which, if any, of the spatial multiplexing approaches can increase the information bearing capacity of fiber at reasonable complexities for digital signal processing. We will examine the performance of linearly polarized and orbital angular momentum guided modes for spatial multiplexing within the same analytical framework to quantify and elucidate their relative merits. Our long term goals are to develop expertise and experimental facilities for the examination of spatial multiplexing in optical fibers (multiple core fiber, few mode fibers and orbital angular momentum varieties); develop collaboration in design of specialty fibers supporting spatial multiplexing - reconciling systems analysis with design criteria; and to discover niche applications benefiting from spatial multiplexing.

光纤提供极低衰减、高带宽（太赫兹）的通信介质，是现代通信网络的骨干。在过去的几十年中，通信的每比特成本呈指数级下降，然而，通过利用具有相干检测和高阶调制的波分复用，我们正在迅速接近容量极限。然而，数据中心和本地网络中数据处理水平的不断提高，继续推动对光纤上更大信息密度的需求。 该建议应用实验，建模和数值技术研究新的调制策略的背景下，相干检测系统。重点将放在光纤空间复用与随之而来的交叉模式的干扰和相位噪声增强。空间复用试图通过利用准正交信道在相同的光学介质中创建新的通信信道-准是因为材料和设备中的物理缺陷破坏了理论上的正交性。必须检查光纤和复用器引起的模式相关性的关键分析，以确定空间复用方法中的哪一种（如果有的话）可以在数字信号处理的合理复杂度下增加光纤的信息承载能力。我们将研究线性偏振和轨道角动量引导模式的性能，在同一分析框架内的空间复用，量化和阐明他们的相对优点。我们的长期目标是发展专业知识和实验设施，用于光纤（多芯光纤，少模光纤和轨道角动量品种）中的空间复用的检查;在支持空间复用的特种光纤设计方面开展合作-协调系统分析与设计标准;并发现受益于空间复用的利基应用。