CIF: Small: Multichannel Signal Processing for Dense Optical Communication Networks

摘要：骨干传输数据网络吞吐量需求的急剧增长推动了全光波分复用(WDM)网络的发展。随着对这些系统的容量需求的增加，物理层的退化变得如此严重，以至于需要复杂的信号处理技术来维持服务质量。通道非线性使多通道光纤系统有别于传统的有线和无线系统。因此，需要新的信号处理和通信理论方法来设计和分析信道；本研究项目满足了这一需求。因此，WDM系统的设计得到了改进，通过这些网络提供给社会的数据吞吐量也大大增加。本研究为WDM系统建立了一个离散的时间-波长非线性模型，并利用该模型设计了强大的信号处理技术。到目前为止，WDM信道一直被认为是一组并行的信道，忽略了信道间的相互影响或简单地将其建模为噪声。在诸如多用户检测、MIMO处理、多信道预编码等无线通信中非常成功的技术的激励下，本研究开发了应用于WDM光纤信道的算法，该算法可以产生显著的容量增益。建立了WDM系统的二维离散时间多项式模型，以考虑信道内和信道间的线性和非线性影响。设计并评估了用于干扰抑制的跨时间和跨波长的多信道处理算法。由于非线性干扰限制了网络的性能，因此使用约束编码来减小这种干扰以换取容量。在全光网络中，来自其他光路的串扰会限制性能。明智地使用空闲光路为整个网络提供多用户编码和路径多样性(冗余和内存)。工作级别声明：在建议的支持级别，PI将尽一切努力满足项目的原始工作范围和级别。

Abstract:The dramatic increase in throughput demands from backbone transport data networks has propelled the development of all-optical wavelength-division-multiplexed (WDM) networks. As the capacity demands on these systems increase, the physical layer degradation becomes so severe that sophisticated signal processing techniques are necessary to maintain the quality of service. Channel nonlinearity differentiates multichannel fiber-optic systems from conventional wireline and wireless systems. Consequently, novel signal processing and communication theoretic approaches are required to design and analyze the channel; this research project addresses this need. As a consequence, WDM system designs are improved and the data throughput available to society though these networks is substantially increased.This research develops a discrete time-wavelength nonlinear model for the WDM system and uses this model to design powerful signal processing techniques. Up to now, the WDM channel has been considered as a set of parallel channels, ignoring the cross-channel effects or modeling them simply as noise. Motivated by techniques that have been so successful in wireless communications, such as multiuser detection, MIMO processing, multichannel precoding, etc., this research develops algorithms to apply to the WDM fiber channel that can produce substantial capacity gains. A two-dimensional discrete-time polynomial model for a WDM system is formulated to account for intra-channel and inter-channel linear and nonlinear effects. Multichannel processing algorithms across time and wavelength for interference mitigation are designed and evaluated. Since nonlinear interference limits the performance of networks, constrained coding to diminish this interference is used to trade capacity for performance. In all-optical networks, crosstalk emanating from other lightpaths can limit performance. Employing idle lightpaths judiciously provides multiuser coding and path diversity (redundancy and memory) to the entire network.Level of effort statement: At the recommended level of support, the PI will make every attempt to meet the original scope and level of effort of the project.