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

光纤WDM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激发了充分利用光纤容量的愿望。光纤通道具有以比目前所利用的更快的数量级(以比特/秒为单位)进行信息传输的潜力。光纤通道的信号衰减是实现高容量的关键问题，特别是在长途链路(跨大陆或跨大洋)和大型网络中。这项研究探索了光纤前后的编码和信号处理，以可能减少信道衰落的影响。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极大增加。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，有时会导致信号的严重线性和非线性退化。所采用的方法是一种通信理论方法，考虑了信号星座、编码、信道均衡和联合信号检测。研究将分三个阶段进行。第一个是识别WDM的最佳和最差时间/波长序列。然后设计出适用于WDM系统的有效的联合最优线路码。最后对串扰抵消的非线性均衡方法进行了研究。优化和系统性能分析的工具是光纤非线性的输入/输出描述和系统仿真。

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.