Abstract Reconfigurable optical add-drop multiplexers (ROADMs) are central pieces in building transparent optical transport networks. However, due to physical limitations, these devices can be a source of in-band crosstalk, which affects the quality of the lightpaths routed and the network performance. Hence, to efficiently design optical networks it is important to study how this impairment is generated and to understand its dependency on relevant network parameters, such as the number of wavelengths used and the node degree. In this paper, we propose a framework to analyze the in-band crosstalk accumulation inside of ROADM-based networks. The framework computes the number of accumulated crosstalk terms in each link of a lightpath considering different physical topologies, as well as different routing and wavelength assignment strategies. An empirical formula is also derived for computing the maximum number of accumulated crosstalk terms as a function of the network parameters. We observe that in the majority of the studied cases, there is a complete agreement between the results of the proposed framework and the empirical formula.

中文翻译：

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一种分析基于 ROADM 的光网络中带内串扰累积的框架

摘要 可重构光分插复用器 (ROADM) 是构建透明光传输网络的核心部件。但是，由于物理限制，这些设备可能成为带内串扰的来源，从而影响路由的光路质量和网络性能。因此，为了有效地设计光网络，重要的是研究这种损伤是如何产生的，并了解其对相关网络参数的依赖，例如使用的波长数量和节点度。在本文中，我们提出了一个框架来分析基于 ROADM 的网络内部的带内串扰累积。考虑到不同的物理拓扑以及不同的路由和波长分配策略，该框架计算光路每个链路中累积串扰项的数量。还导出了一个经验公式，用于计算作为网络参数函数的累积串扰项的最大数量。我们观察到，在大多数研究案例中，所提出框架的结果与经验公式之间存在完全一致。