Network to support multiple lightpaths as long as no

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network to support multiple lightpaths as long as no two lightpaths are assigned the same wavelength on a given link. Lightpaths may be protected by the network in the event of failures. They can be used to provide flexible interconnections between users of the optical network, such as IP routers, allowing the router topology to be tailored to the needs of the router network. An optical line terminal (OLT) multiplexes and demultiplexes wavelengths and is used for point-to-point applications. It typically includes transponders, multiplexers, and optical amplifiers. Transponders provide the adaptation of user signals into the
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462 WDM Network Elements Optical switch l 1 Optical switch l 2 Optical switch l 3 Optical switch l 4 l 1 l 2 l 3 l 4 l 1 l 2 l 3 l 4 OXC OLT OLT Optical switch Local add/drop Tunable transponders From/to clients T R T R T R T R T R T R Figure 7.15 Dealing with add/drop terminations in a wavelength plane approach. An additional optical switch is required between the tunable transponders and the wave- length plane switches. Here, T denotes a transmitter, assumed to be a tunable transmitter
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