ABSTRACT
This chapter explains the survivability of optical networks. The issues of wavelength division multiplexing (WDM) mesh network survivability are discussed for designing a survivable WDM mesh network. To enhance the resource use, there are reports on shared-protection scheme in WDM mesh networks in order to optimize network resource efficiency. Different considerations for restoration schemes in optical WDM mesh networks are given. The chapter discusses the strategy with alternate path routing, the use of wavelength converter, and traffic grooming. In in-fiber, out-band signaling, a wavelength layer is dedicated for the control network. The chapter mentions the fault-management mechanisms used in deploying a survivable optical network in both synchronous optical network/synchronous digital hierarchy rings and mesh-based architectures using optical cross-connects. The chapter explains the advanced network survivability in terms of service availability, service reliability, RT, and service restorability. Efficient algorithms are mentioned in this chapter to reduce network resources for establishing multicast connections using light-trees.
