Multiuser Coding and Signal-Processing for Fiber-Optic WDM Communication Systems

光纤波分复用通信系统的多用户编码和信号处理摘要：对高速数据传输的需求促使人们希望充分利用光纤的全部容量。 光纤通道具有比目前利用的信息传输速度快几个数量级（以每秒比特数计）的潜力。 通过光纤信道的信号降级是实现高容量的关键问题，特别是在长距离链路（跨大陆或跨洋）和大型网络中。 本研究探讨了光纤前后编码和信号处理可能减少信道退化的影响。 掌握光纤介质的这些物理限制可以转化为现有基础设施容量的巨大增加。本研究致力于多信道波分复用（WDM）光纤系统的设计和优化。 多用户系统通常是宽带和高功率的，由于光纤固有的特性，有时会导致信号中严重的线性和非线性退化。 所采取的方法是一个通信理论的方法，考虑信号星座，编码，信道均衡，和联合信号检测。 研究分三个阶段进行。 第一是确定WDM的最佳和最差时间/波长序列。 有效的联合最优线路码的WDM系统将被设计。 最后，本文研究了用于串扰消除的非线性均衡方法，并利用光纤非线性的输入输出描述和系统仿真进行了优化和系统性能分析。

Multiuser Coding and Signal-Processing for Fiber-Optic WDMCommunication Systemsby Maite Brandt-PearceUniversity of VirginiaAbstract:The need for high speed data transmission has motivated the desire toutilize the full capacity of optical fibers. The fiber optic channelholds the potential for information transfer orders of magnitude faster(in bits per second) than is currently exploited. Signal degradationthrough the fiber channel is a key problem in accomplishing highcapacity, especially in long-haul links (transcontinental ortransoceanic) and large networks. This research explores pre- andpost-fiber coding and signal processing possible to reduce the effect ofchannel degradation. Mastering these physical limitations of the fibermedium can translate into a tremendous increase in the capacity ofexisting infrastructure.This research addresses the design and optimization of multi-channelwavelength division multiplexed (WDM) fiber-optic systems. Multiusersystems are typically broadband and high power, sometimes leading tosevere linear and nonlinear degradation in the signal due to propertiesinherent to the fiber. The approach taken is a communications theoreticapproach, considering signal constellation, coding, channelequalization, and joint signal detection. The research is to beperformed in three phases. The first is to identify best and worsttime/wavelength sequences for WDM. Effective jointly optimal line-codesfor WDM systems will then be designed. The research will conclude witha study of nonlinear equalization methods for crosstalk cancellation.The tools used for optimization and system performance analysis areinput/output descriptions of the fiber nonlinearity and systemsimulation.