Minimum-Cost Optical Amplifier Placement in Metro Networks
Minimum-Cost Optical Amplifier Placement in Metro Networks
复制标题
在城域网络中放置成本最低的光放大器
DOI：
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发表时间：
2020
影响因子：
4.7
通讯作者：
M. Tornatore
中科院分区：
文献类型：
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作者：
Memedhe Ibrahimi;Omran Ayoub;F. Musumeci;O. Karandin;A. Castoldi;R. Pastorelli;M. Tornatore
新兴的5G服务正在彻底改变运营商管理和优化其光纤城域网的方式，因此必须重新考虑城域网的设计过程。特别是，最大限度地降低网络成本对于抑制运营商的投资至关重要。利用城域网中相对较短的距离，运营商有机会优化光放大器（OA）的放置，目标是最小化放大器的成本（从而降低网络成本），而不会显著影响传输的光信号的质量。最小化OA成本不仅意味着最小化设备成本（即，升压器、前置放大器和线内放大器），而且可以最小化有源放大器站点的部署和维护成本。在这篇文章中，我们提出了一个启发式算法OA布局和路由和频谱分配（RSA）在城域网中，目标是最大限度地减少OA的总成本，同时保证足够的光信噪比（OSNR）建立光路。在我们的方法中，我们根据部署的OA的位置和类型考虑不同的成本，即，线内放大器（ILA）、增强器和前置放大器，并将我们的优化布局与基准策略进行比较，在基准策略中，OA预先部署在网络节点处，并且沿光纤链路彼此相距沿着固定距离。我们还评估了不同的路由策略对总成本和利用频谱的影响。仿真结果表明，在现实的城域网拓扑结构，我们的策略提供了高达47%的OA成本节约，同时满足最低OSNR的限制。
Emerging 5G services are revolutionizing the way operators manage and optimize their optical metro networks, and the metro network design process must be rethought accordingly. In particular, minimizing network cost is crucial to curb operators’ investment. Taking advantage of relatively-short distances in metro networks, operators have the opportunity to optimize the placement of optical amplifiers (OAs) with the goal of minimizing amplifiers’ cost (and hence decrease network cost) without significantly affecting the quality of transmitted optical signals. Minimizing OA cost translates not only in minimizing the cost of equipment (i.e., boosters, pre-amplifiers and inline amplifiers), but also in minimizing deployment and maintenance costs of active amplifier sites. In this article, we propose a heuristic algorithm for OA placement and for the Routing and Spectrum Assignment (RSA) in metro networks, with the objective of minimizing the total cost of OAs while guaranteeing sufficient optical signal-to-noise ratio (OSNR) of established lightpaths. In our approach, we consider different cost for the deployed OAs, according to their location and type, i.e., inline amplifiers (ILAs), boosters and pre-amplifiers, and compare our optimized placement against benchmark strategies where OAs are pre-deployed at network nodes and at a fixed distance one from the other along optical fiber links. We also evaluate the impact of different routing strategies on the total cost and utilized spectrum. Simulative results, performed over realistic metro network topologies, show that our strategy provides up to 47% OAs cost savings while satisfying minimum OSNR constraints.