Protection domain allocation for optical networks with partial wavelength conversion

In this paper, we propose an approach of optimal protection domain allocation, called OPDA (Optimal Protection Domain Allocation), for dynamically allocating spare capacity for a given working lightpath in WDM networks with partial wavelength conversion capability. The optimization process is formulated as a shortest path searching problem in a transferred graph of cycles and wavelength graph of paths. We conduct a series of experiments to verify the proposed approach on four networks with different topologies and traffic load. We conduct experiments to compare the blocking probability of using OPSA with four reported schemes. The results show that OPDA achieves the best performance.