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

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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.