Resource Allocation for Space-Division Multiplexing: Optical White Box Versus Optical Black Box Networking
Resource Allocation for Space-Division Multiplexing: Optical White Box Versus Optical Black Box Networking
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DOI：
10.1109/jlt.2015.2493123
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发表时间：
2015-12-01
影响因子：
4.7
通讯作者：
Forchheimer, Robert
中科院分区：
文献类型：
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作者：
Muhammad, Ajmal;Zervas, Georgios;Forchheimer, Robert
具有空分复用（SDM）的弹性光网络（EON）是满足未来网络容量需求的唯一明显的长期解决方案。通过空间光纤（例如多芯光纤（MCF））向EON引入空间为网络规划和资源优化问题提供了额外的维度以及挑战。存在用于SDM传输介质、交换和放大的各种类型的技术;它们中的每一个引起对网络的不同能力和约束。例如，采用MCF作为SDM的传输介质可以减轻EON路由和频谱分配问题的频谱连续性约束。事实上，在网络流量的路由期间，核心可以在不同的链路上自由切换。另一方面，在解决资源分配问题时，应考虑核间串扰。在弹性SDM网络的交换框架中，可编程按需架构（AoD）节点（光白色盒）相对于硬连线可重配置光分插复用器（ROADM）（光黑盒）可以提供更可扩展的解决方案。本研究探讨了路由，调制，频谱和核心分配（RMSCA）的问题，弱耦合MCF为基础的弹性SDM网络，通过AoD和静态ROADM实现。建议的RMSCA策略集成的频谱资源分配，交换资源的部署，和物理层损害的核心间串扰，通过一个多目标的成本函数。所提出的策略在网络层和物理层之间执行跨层优化，以计算候选资源解决方案的实际核间串扰，并且专门定制以适应网络中部署的光节点的类型。所有这些策略的目的是在提供具有不同容量要求的需求时联合优化交换和频谱资源效率。广泛的仿真结果表明：1）通过利用基于ROADM的SDM网络的密集节点内连接性，与基于AoD的解决方案相关的资源效率和供应的业务量显著提高，2）核间串扰感知策略实质上提高了基于AoD的SDM网络的供应的业务量，以及3）对于设计有与具有ROADM的AoD节点相关的AoD节点的网络，交换模块随着业务量的增加而非常缓慢地增长，从而使AoD成为未来SDM网络的可扩展且成本有效的选择。
Elastic optical networking (EON) with space-division multiplexing (SDM) is the only evident long-term solution to the capacity needs of the future networks. The introduction of space via spatial fibers, such as multicore fibers (MCF) to EON provides an additional dimension as well as challenges to the network planning and resource optimization problem. There are various types of technologies for SDM transmission medium, switching, and amplification; each of them induces different capabilities and constraints on the network. For example, employing MCF as the transmission medium for SDM mitigates the spectrum continuity constraint of the routing and spectrum allocation problem for EON. In fact, cores can be switched freely on different links during routing of the network traffic. On the other hand, intercore crosstalk should be taken into account while solving the resource allocation problem. In the framework of switching for elastic SDM network, the programmable architecture on demand (AoD) node (optical white box) can provide a more scalable solution with respect to the hard-wired reconfigurable optical add/drop multiplexers (ROADMs) (optical black box). This study looks into the routing, modulation, spectrum, and core allocation (RMSCA) problem for weakly-coupled MCF-based elastic SDM networks implemented through AoDs and static ROADMs. The proposed RMSCA strategies integrate the spectrum resource allocation, switching resource deployment, and physical layer impairment in terms of intercore crosstalk through a multiobjective cost function. The presented strategies perform a cross-layer optimization between the network and physical layers to compute the actual intercore crosstalk for the candidate resource solutions and are specifically tailored to fit the type of optical node deployed in the network. The aim of all these strategies is to jointly optimize the switching and spectrum resource efficiency when provisioning demands with diverse capacity requirements. Extensive simulation results demonstrate that 1) by exploiting the dense intranodal connectivity of the ROADM-based SDM network, resource efficiency and provisioned traffic volume improve significantly related to the AoD-based solution, 2) the intercore crosstalk aware strategies improve substantially the provisioned traffic volume for the AoD-based SDM network, and 3) the switching modules grows very gently for the network designed with AoD nodes related to the one with ROADMs as the traffic increases, qualifying AoD as a scalable and cost-efficient choice for future SDM networks.