chapter 7
WDM Network Elements
WE HAVE ALREADY EXPLORED some of the motivations for deploying WDM networks in Chapter 1 and will go back to this issue in Chapter 13. These networks provide circuit-switched end-to-end optical channels, or lightpaths, between network nodes to their users, or clients. A lightpath consists of an optical channel, or wavelength, between two network nodes that is routed through multiple intermediate nodes. Intermediate nodes may switch and convert wavelengths. These networks may thus be thought of as wavelength-routing networks. Lightpaths are set up and taken down as dictated by the users of the network.
In this chapter we will explore the architectural aspects of the network elements that are part of this network. ...
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