chapter 10
WDM Network Design
IN PREVIOUS CHAPTERS, WE LEARNED that the optical layer provides high-speed circuit-switched connections, or lightpaths, between pairs of higher-layer equipment such as SONET/SDH muxes, IP routers, and Ethernet switches. The optical layer realizes these lightpaths over the physical fiber using elements such as optical line terminals (OLTs), optical add/drop multiplexers (OADMs), and optical cross-connects (OXCs). We called a network using such lightpaths a wavelength-routing network. In this chapter, our goal is to study how to design a wavelength-routing network. This involves studying not only how to design the optical layer but also how the higher-layer SONET or IP network is to be designed because the design ...
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