Maximising throughput in multiwavelength optical networks operating in nonlinear regime

高容量、低时延无处不在的宽带通信基础设施是数字经济发展壮大的关键。光纤是这一基础设施的骨干，必须确保有足够的能力发展新的、高容量的改变生活的服务。然而，光纤通道是非线性的。非线性信道的容量是未知的，研究的重点是开发适当的信道模型，以便能够计算不同调制格式和符号速率的可实现信息速率，以及可以通过非线性缓解和编码实现的任何增加。虽然这些技术对点对点链路的可实现速率的提高可能有限，但当应用于网络拓扑结构时，它们可以转化为网络吞吐量的显着增益。这需要结合非线性信道的信息论和图论来量化网络吞吐量作为网络拓扑和非线性信道特性的函数。这项研究可能会从整体上改变光网络架构的设计和数据通信基础设施的设计。该学生的研究重点是在比目前使用的带宽更宽的带宽下运行光纤系统和网络性能的分析。光纤带宽工作范围的扩展需要对相干光纤传输的受激拉曼散射进行分析，这是迄今为止尚未分析的，需要开发用于系统和网络分析的快速分析工具，以及宽带非线性状态下网络吞吐量的量化。与EPSRC主题领域的相关性：面向未来系统的智能信息基础设施和光子学的ICT战略优先事项；数字信号处理、信息通信技术网络领域的数字经济。

High-capacity, low-delay ubiquitous broadband communication infrastructure is critical to the development and grown of the digital economy. Optical fibres form the backbone of this infrastructure and must ensure sufficient capacity for the development of new, high-capacity life transforming services. However, optical fibre channels are nonlinear. The capacity of nonlinear channels is unknown and the research is focused on the development of appropriate channel models to enable the calculation of achievable information rates for different modulation formats and symbol rates and any increaseswhich can be achieved through nonlinearity mitigation and coding. Whilst increases in achievable rates with these techniques may be limited for point-to-point links, they could be translated in significant gains in network throughput when applied to network topologies. This requires the combination of information theory for nonlinear channels and graph theory for quantifying network throughputs as a function of both the network topology and nonlinear channel properties. Potentially this research could transform he design of optical network architectures and the design of the data communications infrastructure as a whole. The student's research focuses on the ananlysis of optical fibre systems and network performance when operated over significantly wider bandwidths than used currently. Expansion of the optical fibre bandwidth operating range requires the analysis of stimulated Raman scattering for coherent optical fibre transmission, not analysed to date, the development of rapid analytical tools for systems and networks analysis and the quantification of the network throughputs in the wideband nonlinear regime.Relevance to EPSRC thematic areas: ICT with strategic priorities in Towards Intelligent Information Infrastructure and Photonics for future systems; Digital Economy in areas Digital Signal Processing, ICT Networks.