Space continuity constraint in dynamic Flex-Grid/SDM optical core networks: An evaluation with spatial and spectral super-channels
Space continuity constraint in dynamic Flex-Grid/SDM optical core networks: An evaluation with spatial and spectral super-channels
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DOI：
10.1016/j.comcom.2018.05.013
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发表时间：
2018-08-01
影响因子：
6
通讯作者：
Spadaro, Salvatore
中科院分区：
文献类型：
--
作者：
Rumipamba-Zambrano, Ruben;Moreno-Muro, Francisco-Javier;Spadaro, Salvatore
空分复用（SDM）作为克服单模光纤的容量限制的有希望的解决方案出现。在Flex-Grid/SDM光网络中，提供输入/输出光纤端口和空间信道之间的完全互连的节点，典型的SDM可重构光分插复用器（SDMROADM），称为具有通道支持的独立交换（具有LC支持的InS），需要非常复杂和昂贵的节点架构。已经提出了替代设计来放松它们的要求，例如通过一次在所有空间信道上切换一个频谱片来实现联合切换（JoS）的设计。在这项工作中，我们评估了一个具有成本效益的SDM-ROADM架构的好处，该架构在（i）网络吞吐量方面的性能和（ii）通过强制空间连续性约束（SCC）端到端，即，沿着连接物理路径。在动态Flex-Grid/在空间和频谱超级信道下，针对基于具有LC支持的InS和JoS SDM-ROADM的基准网络的SDM场景。考虑到多光纤（MF）和多芯光纤（MCF）SDM解决方案，我们量化了将空间多重性从7个空间信道扩展到30个空间信道时的网络吞吐量。所获得的结果表明，在网络吞吐量方面的差异，采用没有LC支持SDM-ROADM的InS仅比具有LC支持SDM-ROADM的InS低14%，而网络资本支出可以显著降低86%。相比之下，采用InS而不支持LC的网络SDM-ROADM的吞吐量比Jos高出40%，而网络CAPEX可以提高到3倍。本文还分析了空间多样性对网络指标（吞吐量和CAPEX）的影响。
Space Division Multiplexing (SDM) appears as a promising solution to overcome the capacity limits of single mode optical fibers. In Flex-Grid/SDM optical networks, nodes offering full interconnection between input/ output fiber ports and spatial channels, typical SDM-Reconfigurable Optical Add/Drop Multiplexer (SDMROADM) referred to as independent switching with lane support (InS with LC support), require very complex and expensive node architectures. Alternative designs have been proposed to relax their requirements, such as those realizing Joint-switching (JoS) by switching one spectrum slice across all spatial channels at once. In this work, we evaluate the benefits of a cost-effective SDM-ROADM architecture that makes a trade-off between (i) performance in terms of network throughput and (ii) architectural complexity by forcing the Space Continuity Constraint (SCC) end-to-end, that is, along the connection physical path. The performance and architectural complexity of such a SDM-ROADM solution are compared in dynamic Flex-Grid/SDM scenarios against benchmark networks based on InS with LC support and JoS SDM-ROADMs, under both spatial and spectral super-channels. We quantify the network throughput when scaling the spatial multiplicity from 7 to 30 spatial channels, considering Multi-Fiber (MF) as well as Multi-Core Fiber (MCF) SDM solutions. The obtained results reveal that differences in terms of network throughput employing InS without LC support SDM-ROADMs is merely up to 14% lower than InS with LC support SDM-ROADMs, while the network CAPEX can be dramatically reduced by 86%. In contrast, networks employing InS without LC support SDM-ROADMs carry up to 40% higher throughput than JoS ones, whereas the network CAPEX can be raised up to 3 x. This paper also analyses the spatial multiplicity impact on both network metrics (throughput and CAPEX).