Toward the forthcoming spatial division multiplexing (SDM) era, a spatial channel network (SCN) was recently proposed in which the optical layer is explicitly decoupled from the hierarchical SDM and wavelength division multiplexing (WDM) layers, and an optical node evolves into a spatial cross-connect (SXC) and wavelength cross-connect (WXC) to achieve a hierarchical optical cross-connect (HOXC). In this paper, we perform a technoeconomic analysis of SCNs comprising different HOXC architectures employing different planning policies on how the degree of spectral grooming by WXCs and spatial bypassing by SXCs in an SCN affects the total required number of spatial lanes (SLs), whose physical entity is the core in parallel single-mode fibers or a multicore fiber and the total node cost in the SCN. Toward this end, we develop a routing and SDM/WDM multilayer resource assignment (RSWA) heuristic in which spatial bypassing and spectral grooming are performed such that the required number of SLs is minimized. Using RSWA with four planning policies, i.e., express-only, express/local-hybrid (spatial-bypass-oriented), express/local-hybrid (spectral-grooming-oriented), and local-only, we compare the performance levels of a high-port-count matrix-switch-based HOXC and core selective switch (CSS) based HOXC with those of the baseline-stacked conventional WXCs as the network traffic load increases. Here, a CSS is a new type of spatial switch, which is the counterpart to a wavelength selective switch in a current WDM network. We clearly show that hierarchical spatial bypassing and spectral grooming are beneficial in terms of the required number of SLs and network-total node cost when the required number of SLs between optical nodes in an SCN is equal to or greater than roughly 10.

中文翻译：

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空间通道网络（SCN）的技术经济分析：空间旁路和频谱修饰带来的好处[已邀请]

在即将到来的空分复用（SDM）时代，最近提出了一种空间信道网络（SCN），其中光层与分层SDM和波分复用（WDM）层明确分离，并且光节点发展成为空间交叉连接（SXC）和波长交叉连接（WXC）以实现分层的光学交叉连接（HOXC）。在本文中，我们对包含不同HOXC架构的SCN进行了技术经济分析，并采用了不同的规划策略来研究WCN的频谱修饰程度和SXC在SCN中的空间绕过程度如何影响所需的空间通道总数（SL）实体是并行单模光纤或多芯光纤的核心，而SCN中的总节点成本。为此，我们开发了路由和SDM / WDM多层资源分配（RSWA）启发式方法，其中进行了空间旁路和频谱修饰，以使所需的SL数量最小化。通过将RSWA与四种计划策略结合使用，即仅快速，快速/本地混合（面向空间绕过），快速/本地混合（面向频谱整理）和仅本地，我们比较了性能水平随着网络流量负载的增加，基于高端口数矩阵交换机的HOXC和基于核心选择交换机（CSS）的HOXC以及那些基线堆叠的常规WXC的HOXC。在这里，CSS是一种新型的空间交换器，它是当前WDM网络中波长选择交换器的对应物。