This chapter covers the following topics:
Challenges in the metro-area network
Multiplexing optical signals
Dense wavelength division multiplexing fundamentals
Optical impairments in DWDM systems
Cisco DWDM equipment
Building a DWDM infrastructure
Today's explosion in data traffic, fueled in large part by the growth of the Internet, has caused rapid depletion of available fiber bandwidth in the metropolitan area. As a result, service providers have reacted by increasing capacity in their long-haul and core networks. The bandwidth bottleneck is now that of the metropolitan-area networks (MANs), where capacity has not increased as greatly as the long-haul networks. Keeping pace with ...