Restoration Schemes in the Survivability of Optical Networks

Authored by: Partha Pratim Sahu

Advances in Optical Networks and Components

Print publication date:  July  2020
Online publication date:  July  2020

Print ISBN: 9780367265656
eBook ISBN: 9780429293962
Adobe ISBN:

10.1201/9780429293962-8

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Abstract

Due to failures occurring in a network, the transmission of signals is disrupted [1–3] as mentioned in Chapter 7. During construction or destructive natural calamities, such as earthquakes, flood, etc., a cut in a fiber cable (having a large number of optical fibers) can lead to a huge loss in data and revenue. There are mainly two failures which may disrupt transportation – traffic-node failure and link failure [1] – as shown in the ring network in Figure 8.1. A node can also fail because of disastrous events such as fire or flooding; this is called as node failure. Apart from node and link failures, there is another type of failure called channel failure in optical WDM networks. A channel failure is basically because of the failure of the transmitting or receiving equipment operating on that channel. For survivability against these failures, there are two types of approaches – protection and restoration. In protection, backup paths are formed during the establishment of a connection initially. Different protection schemes were already discussed in Chapter 7. Although resource utilization is improved by considering different sharing schemes (as discussed in Chapter 7), still a solution to the problem of poor utilization of resources [2] (especially wavelength channel and hardware (add/drop mux, WDM, optical switch, OXC, etc.)) needs to be found. Restoration may be a better solution to the resource utilization problem. In this chapter, we shall discuss different restoration schemes [4].

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