In particular, three types of traffic loading scenarios have been studied: small,
medium, and large (see Table 8.7). In the small loading case, the client demands only
comprise 100 Mbps Fast Ethernet requests. The medium traffic case augments the above
with a small amount of Gigabit Ethernet demands (about 10 percent). Finally, the large
loading case adds a full range of demands from Fast Ethernet to Gigabit Ethernet and
even full 10 Gigabit Ethernet. To assess the economic CAPEX costs of the two schemes,
the required subsystems are briefly reviewed, as highlighted in Table 8.8.
NOTE The prices stated here are bound to decline over time, and hence the listing is
provided more for relative comparison purposes.
Consider the EoWDM solution first. Here, the overall ROADM systems are comprised
of three main sections??”multiplex, amplification, and local access. The multiplex
section consists of two AWG filters that are used to multiplex/demultiplex composite
DWDM signals. Meanwhile, the amplification section consists of preline and inline (i.e.,
post-line) EDFA devices for analog DWDM amplification. Finally, the local access section
consists of an optical switch, for example, WSS, that allows for adding or dropping
wavelength lightpaths.
Pages:
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572