针对固定栅格WDM(波分复用)光网络频谱利用率低的缺点, 需对网络使用灵活栅格技术进行升级, 提出了基于瓶颈链路优先的升级策略。文章定义了瓶颈链路, 提出两种基于瓶颈链路的升级策略: 链路密度策略和拥塞链路策略, 并对这两种策略进行仿真, 仿真结果显示两种策略都能够降低带宽阻塞率。链路密度策略的带宽阻塞率降低程度取决于所取阈值的不同, 而拥塞链路策略能有效地降低带宽阻塞率。

In order to solve the inefficient spectrum utilization problem in fixed-grid WDM networks, an upgrading scheme is proposed to upgrade the bottleneck links from fixed grid to flex grid networks. The paper defines the concept of bottleneck links, and proposes two strategies: the Link Density(LD) strategy and the congestion strategy. Numerical results show that the Bandwidth Blocking Rate (BBR) is reduced by the two strategies. The LD strategy performs different BBR reduction depending on different thresholds and the congestion strategy can effectively reduce the BBR.