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DWDM Network Designs and Engineering Solutions by Tony Antony, Ashwin Gumaste

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Chapter 2. Networking with DWDM -1

For those readers who are well versed with the fundamentals of optical communication principles, this chapter sheds light on the underlined technologies and components involved in a wavelength division multiplexing (WDM) network. In Chapter 1, “Introduction to Optical Networking,” we discussed point-to-point WDM links. Each node in the link is a WDM network element (NE). In this chapter we focus on the individual heuristics of a node or NE. A WDM node has features of adding, dropping, or passing through lightpaths. This kind of lightpath communication is facilitated by O-E-O (opto-electro-opto) or O-O-O (optical to optical) switch fabrics. At the ingress of each node, the composite WDM signal is preamplified ...

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