Satellite Laser Communication Assisted P-cycle Protection Against SRLG Failures in WDM Optical Networks

Since a single fiber carries a huge amount of data in WDM optical networks, survivability for terrestrial optical networks (TONs) has been an important area of research. P-cycle protection against shared risk links group (SRLG) failures in WDM optical networks has been studied extensively due to p-cycle’s ability to achieve ring like recovery speed and maintain the capability efficiency of a mesh-restorable network. However, existing protection technologies totally rely on TONs themselves, therefore it is difficult to deal with optical cable destructions in case of unforeseen SRLG failures. In recent years, optical wireless communication (OWC) has been widely studied owing to its advantages of large bandwidth, high data rate and license-free spectrum. As an important branch in the field of OWC, satellite laser communication (SLC) can provide homogeneous spatial ground-to-satellite and inter-satellite laser links, which are free from terrestrial disasters, and bring a new solution to improve the survivability of TONs. In this paper, we apply the SLC technology in the p-cycle design against SRLG failures in TONs. An integer linear programming (ILP) model is provided to analysis the performance of new p-cycle protection scheme in terms of joint working and spare capacity, the ratio of spare capacity and working capacity, and the success rate of protection.