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:


 Download Chapter



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].

Search for more...
Back to top

Use of cookies on this website

We are using cookies to provide statistics that help us give you the best experience of our site. You can find out more in our Privacy Policy. By continuing to use the site you are agreeing to our use of cookies.