Optical WDM Mesh Networks with Dedicated Optical Path Protection with Finite Differences

Protection and restoration strategies are critical to Optical mesh networks. Two are the most usual methods of the optical path protection. In the first method, the spare capacity is usually allocated as a "dedicated" resource where the backup capacity is allocated for the sole use of the connection or link. In the second method, it is associated as a "shared" resource, where the allocated backup capacity can be shared with other connections or links. In this paper, the first method will be examined in light of the finite differences. The latter provide two methods, the first is the linear function and the second is the polynomial function. The polynomial function is calculated by two methods. One is accurate and the other approximated. These methods are arithmetical and solve successfully the survivability problems. These methods are used for the verification of their results.