Connection provisioning in Wavelength Division Multiplexing (WDM) networks needs to account for a number of crucial parameters. On the one hand, operators need to ensure the connection availability requirements defined in Service Level Agreements (SLAs). This is addressed by selecting an appropriate amount of backup resources and recovery strategies for the connections over which services are provisioned. Services requiring less strict availability requirements can be routed over unprotected lightpaths. Services with more strict availability requirements are provisioned over protected lightpaths in order to cope with possible failures in the network. Another important aspect to consider during the provisioning process is energy efficiency. Green strategies leverage on setting network devices in Sleep Mode (SM) or Active Mode (AM) depending on whether or not they are needed to accommodate traffic. However, frequent power state changes introduce thermal fatigue which in turn has a negative effect on the device lifetime. Finally, in multi-period traffic scenarios, it is also important to minimize the number of reconfigurations of lightpaths already established in the network in order to avoid possible traffic disruptions at higher layers. The work presented in this paper tackles the connection provisioning paradigm in an optical backbone network with a multi-period traffic scenario. More specifically the paper looks into the interplay among (i) energy efficiency, (ii) thermal fatigue, and (iii) lightpath reconfiguration aspects. To this end, the Energy and Fatigue Aware Heuristic with Unnecessary Reconfiguration Avoidance (EFAH-URA) is introduced, showing that it is possible to balance the three aspects mentioned above in an efficient way. When compared to the pure energy-aware strategies, EFAH-URA significantly improves the average connection availability for both unprotected and protected connections. On the other hand, it is done at the expense of reduced energy saving.

波分复用（WDM）网络中的连接设置需要考虑许多关键参数。一方面，运营商需要确保服务级别协议（SLA）中定义的连接可用性要求。通过为提供服务的连接选择适当数量的备份资源和恢复策略，可以解决此问题。要求不太严格的可用性要求的服务可以通过不受保护的光路进行路由。为了保护网络中可能出现的故障，在受保护的光路上提供了对可用性要求更为严格的服务。在供应过程中要考虑的另一个重要方面是能源效率。绿色策略根据将网络设备设置为睡眠模式（SM）或活动模式（AM）的方式来利用，具体取决于是否需要它们来容纳流量。但是，频繁的功率状态变化会引入热疲劳，进而对器件寿命产生负面影响。最后，在多周期流量场景中，最小化网络中已经建立的光路径的重新配置次数也很重要，以避免高层的流量中断。本文中介绍的工作解决了具有多周期流量场景的光骨干网中的连接供应范例。更具体地说，本文探讨了 频繁的功率状态变化会引入热疲劳，进而对器件的寿命产生负面影响。最后，在多周期流量场景中，最小化网络中已经建立的光路径的重新配置次数也很重要，以避免高层的流量中断。本文中介绍的工作解决了具有多周期流量场景的光骨干网中的连接供应范例。更具体地说，本文探讨了 频繁的功率状态变化会引入热疲劳，进而对器件的寿命产生负面影响。最后，在多周期流量场景中，最小化网络中已经建立的光路径的重新配置次数也很重要，以避免高层的流量中断。本文中介绍的工作解决了具有多周期流量场景的光骨干网中的连接供应范例。更具体地说，本文探讨了 本文中介绍的工作解决了具有多周期流量场景的光骨干网中的连接供应范例。更具体地说，本文探讨了 本文中介绍的工作解决了具有多周期流量场景的光骨干网中的连接供应范例。更具体地说，本文探讨了（i）能源效率，（ii）热疲劳和（iii）光路重构方面。为此，引入了避免不必要的重新配置的能量和疲劳意识启发式方法（EFAH-URA），这表明可以有效地平衡上述三个方面。与纯能量感知策略相比，EFAH-URA可显着提高无保护连接和受保护连接的平均连接可用性。另一方面，这样做是以减少节能为代价的。