SGER: Exploratory Research on Integrative Physical/Logical Layers Performance Scaling in Optical Packet Switching Systems

0532762 Bergman以数据为中心的流量的爆炸性增长和对多样化服务的需求正在推动光通信系统向分组交换网络迁移。光分组交换（OPS）网络具有光域的巨大容量和独立的分组路由所提供的灵活连接的独特组合，其逻辑层的关键性能指标，包括吞吐量、延迟、可扩展性和丢包率，已经被广泛研究。然而，物理层的性能，一个关键措施的可行性分组交换网络旨在实现在光域中，没有很好地理解在这方面。在OPS网络中，光分组通常通过复杂的互连拓扑网络进行自路由.由于路由机制可以统计地执行以确保公平性和负载平衡，因此通常不知道任何分组可能采取的确切路径。此外，在分组内携带的数据结构可以是多样的，并且包括以不同比特率和调制格式编码的数据。因此，尽管可以示出逻辑拓扑根据网络层性能度量缩放，但这并不一定意味着具有复杂光分组传播的物理层也在维持端到端通信方面进行缩放，在这个提议的探索性研究中，PI将致力于实现一种用于评估OPS网络中集成物理/逻辑层性能的方法，该方法真正涵盖了缩放度量的不同集合，并捕获了这些网络中光信号传播的复杂性质。为了实现这些目标的实验调查将进行采用一个独特的，集成系统的一个完全连接的12端口OPS网络包含36个开关元件。这个experimentartest-床将使直接耦合的数值和分析建模与现实的数据传播端到端通过一个完整的实施OPS network.Intellectual优点：拟议的探索性研究将建立一个新的方法bridgingthe网络之间的差距在OPS通信系统的逻辑和物理层。这些活动将为一个新兴的研究领域奠定基础，该领域将整合两个目前独立的学科。逻辑层和物理层的合并将使集成系统方法能够重新理解OPS网络的关键性能指标。与电子系统不同，光通信系统的物理层受到光场与传输介质、开关元件和放大器的相互作用（线性和非线性）的影响。因此，总的复杂系统的性能不能解耦到其物理和logicalcomponent层，必须在一个综合的方式进行研究。然而，进行这种调查的工具还不存在。在这个探索性的研究计划中，PI将在一个完全实现的光分组交换网络单元中进行实际的流量路由实验.这些实验将强调物理层的可扩展性，因为进入每个超高容量端口的数据包可能包含跨越WDM C波段的有效载荷数据。整个有效载荷通过网络元件被连续地端到端路由，并且因此可以包括沿着多个有效载荷波长沿着编码的调制速度和格式的不同集合。这些实验研究通过直接耦合物理层和逻辑层，将使创建一个真正的综合systemsmodel的OPS networks.Broader影响的性能：显然，迁移的光通信系统是朝着dynamicnetworks驱动的爆炸性增长的数据包为中心的流量。OPS网络提供了利用光波通信的巨大容量的潜力，同时通过单独的分组路由向多个流量目的地提供细粒度的连接。由透明的端到端有效载荷路径实现的数据结构、编码和调制方案的多样化集合是一个网络元件，可以潜在地随着许多新的网络代而无缝地演进。实验台实验和建模用于演示集成的物理/逻辑层性能和可扩展性将使未来超高容量分组交换系统的智能设计成为可能。

0532762BergmanThe explosive growth in data centric traffic and demand for diverse services are driving the migration ofoptical communication systems toward packet switched networks. Optical packet switched (OPS)networks offer the unique combination of encompassing the enormous capacity of the optical domainwhile providing versatile connectivity afforded by individual packet routing.The key performance metrics of OPS networks at the logical layer, including throughput, latency,scalability, and packet-loss-rates have been studied extensively for various architectures. However, thephysical layer performance, a critical measure of the feasibility of packet switched networks intended forimplementation in the optical domain, is not well understood in this context. In OPS networks opticalpackets are typically self-routed through a complex web of interconnection topologies. The exact path anypacket may take is not often known, as the routing mechanism may be performed statistically to achievefairness and load balancing. Furthermore, the data structure carried within the packet may be diverse andinclude data encoded in different bitrates and modulation formats.Thus, whereas it may be shown that the logical topology scales in terms of the network layer performancemetrics, it does not necessarily follow that the physical layer with complex optical packet propagationalso scales in terms of maintaining end-to-end signal integrity.In this proposed exploratory research the PI will aim to achieve a methodology for evaluating theintegrated physical/logical layers performance in OPS networks that truly encompasses the diverse setof scaling metrics and captures the complex nature of optical signal propagation in these networks. Toaccomplish these goals an experimental investigation will be performed employing a unique, integratedsystem of a fully connected 12-port OPS network containing 36 switching elements. This experimentaltest-bed will enable direct coupling between numerical and analytical modeling with realistic datapropagated end-to-end through a complete implemented OPS network.Intellectual Merit: The proposed exploratory research will establish a novel methodology for bridgingthe gap between the network logical and physical layers in OPS communication systems. These activitieswill create the groundwork for an emerging field of research that integrates two currently separatedisciplines. The merging of the logical and physical layers will enable an integrated systems approach to anew understanding of the critical performance metrics for OPS networks. Unlike electronic systems, thephysical layer of optical communication systems is subject to numerous impairments arising from theinteractions (linear and nonlinear) of the optical field with the transport medium, switching elements, andamplifiers. Thus, the total complex system performance cannot be decoupled into its physical and logicalcomponent layers and must be studied in an integrated fashion. The tools to perform this investigationhowever do not yet exist. In this proposed exploratory research program the PI will perform realistic trafficrouting experiments in a completely implemented optical packet switched network element. Theseexperiments will stress the physical layer scalability as incoming packets to each of the ultra-highcapacity ports may contain payload data that spans the WDM C-band. The entire payload is transparentlyrouted end-to-end through the network element and thus may include a diverse set of modulation speedsand formats encoded along the multiple payload wavelengths. These experimental investigations bydirectly coupling the physical and logical layers, will enable the creation of a truly integrative systemsmodel for the performance of OPS networks.Broader Impact: Clearly, the migration of optical communication systems is headed toward dynamicnetworks driven by the explosive growth of packetized data centric traffic. OPS networks offer thepotential of exploiting the enormous capacity of lightwave communications while delivering fine grainedconnectivity to a multitude of traffic destinations via individual packet routing. The diverse set of datastructures, encoding, and modulation schemes enabled by the transparent end-to-end payload path createsa network element that can potentially seamlessly evolve with many new network generations. Test-bedexperiments and modeling employed to demonstrate the integrated physical/logical layers performancescalability will enable intelligent design of future ultra-high capacity packet switched systems.