Research On GMPLS-Based Transparent Optical Network And Failure Location Algorithm

Transport network is evolving to the next generation optical network with improved transparency and intelligence. "Transparency" means advanced all-optical switching nodes are expected to be deployed to all-optically transmit client datas from the source to the detination in order to achieve reduced energy consumption as well as enhanced network flexibility to support various potential services with different protocols. "Intelligence" means a distributed control plane is introduced to enable an automatic lightpath provisioning with high efficiency and resilience.However, the lightpath in transparent optical networks is subject to physical impairment and wavelength continuity constraints. One of solutions is to extend the control plane to encompass various kinds of optical performance information, but this may make the control protocol over-complicated and degrade the scalability.This thesis investigates the centralized control architecture, where a Network Management System (NMS) with awareness of physical impairment and wavelength availability information is introduced to collaborate with the traditional control plane and impairment-awared path computation element (PCE) to provision the lightpath with guaranteed quality. Corresponding design including the NMS architecture, the interface between NMS and network elements (NEs), the interface between NMS and PCE, and the interface between NMS and network operators, is discussed in detail. Furthermore, considering the lightpath resilience requirement and the failure spread feature in transparent optical networks, the fault management capability is intensively investigated under the aforementioned NMS architecture. Especially, a new failure location algorithm is proposed, and simulation results verify that this algorithm can achieve an improved failure location precision by using a reduced number of optical performance monitors (OPM).