Unformatted text preview: We will use the Optical Transport Network (OTN) architecture introduced in Section 6.2 as a model of a layered optical network, as shown in Figure 8.2. In Section 6.2, we primarily discussed the electronic layer of OTN. Now we turn our attention to the optical layer. At the top is the optical channel (OCh) layer. This layer takes care of end-to-end routing of the lightpaths. We have been using the term lightpath to denote an optical connection. More precisely, a lightpath is an optical channel trail between two nodes that carries an entire wavelength’s worth of trafﬁc. A lightpath traverses many links in the network, wherein it is multiplexed with many other wavelengths carrying other lightpaths. It may also get regenerated along the way. Note that we do not include any electronic time division multiplexing functions in the optical layer....
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- Spring '09
- Amplifier, Time-division multiplexing, Multiplexing, Optical Transport Network, optical layer