Passive Optical Networks (PON) support subscribers with bandwidth requirements more than 10 Mbps. Fiber and node failures in a PON network can lead to large amounts of data loss, while isolating the central office from the subscribers. Hence, high network availability is desired when a PON is used for business enterprises and for providing mobile backhaul services. To maximize network availability, several protection architectures have been proposed in literature. In this chapter, we critically analyze and compare novel WDM PON protection architectures amongst those proposed in the literature. The comparison is done from topology, resource utilization and power budget perspectives. We also discuss protection mechanisms that are typically used in the architectures and their impact on restoration.
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