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On optimal designs of transparent WDM networks with 1 + 1 protection leveraged by all-optical XOR network coding schemes

机译：全光XOR网络编码方案利用1 + 1保护的透明WDM网络的最佳设计

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摘要

Network coding techniques are seen as the new dimension to improve the network performances thanks to the capability of utilizing network resources more efficiently. Indeed, the application of network coding to the realm of failure recovery in optical networks has been marking a major departure from traditional protection schemes as it could potentially achieve both rapid recovery and capacity improvement, challenging the prevailing wisdom of trading capacity efficiency for speed recovery and vice versa. In this context, the maturing of all-optical XOR technologies appears as a good match to the necessity of a more efficient protection in transparent optical networks. In addressing this opportunity, we propose to use a practical all-optical XOR network coding to leverage the conventional 1 + 1 optical path protection in transparent WDM optical networks. The network coding-assisted protection solution combines protection flows of two demands sharing the same destination node in supportive conditions, paving the way for reducing the backup capacity. A novel mathematical model taking into account the operation of new protection scheme for optimal network designs is formulated as the integer linear programming. Numerical results based on extensive simulations on realistic topologies, COST239 and NSFNET networks, are presented to highlight the benefits of our proposal compared to the conventional approach in terms of wavelength resources efficiency and network throughput.
机译：由于能够更有效地利用网络资源，网络编码技术被视为提高网络性能的新维度。的确，将网络编码应用于光网络故障恢复领域已标志着与传统保护方案的重大偏离，因为它有可能同时实现快速恢复和容量提高，从而挑战了为提高速度而降低容量效率的普遍智慧。反之亦然。在这种情况下，全光XOR技术的成熟似乎与透明光网络中更有效保护的必要性很好地匹配。为了抓住这个机会，我们建议使用一种实用的全光XOR网络编码来利用透明WDM光网络中的常规1 +1光路保护。网络编码辅助保护解决方案在支持条件下结合了共享同一目标节点的两个需求的保护流，为减少备用容量铺平了道路。考虑到针对最佳网络设计的新保护方案的运行，一个新颖的数学模型被表述为整数线性规划。提出了基于对实际拓扑，COST239和NSFNET网络进行广泛仿真的数值结果，以突出我们的建议与传统方法相比在波长资源效率和网络吞吐量方面的优势。

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