Abstract
Optimization of IP over DWDM networks is studied under constraints of cost
(CAPEX) and energy consumption. Realistic IP traffic mapped to the optical
DWDM layer together with leased L1/L2 lines form the basic traffic load
which is expanded by a factor of 33 and 100 for a 10-year projection.
General power and cost savings are taken into account for the 2020
scenarios. The DWDM core network (Germany 50) is analyzed for
mixed-line-rate and reach/bandwidth adaptive scenarios; the latter is
realized by optical orthogonal frequency division multiplexing (O-OFDM).
Although the adaptive scenario shows to be more hardware efficient in terms
of total number of transponders, the mixed-line-rate approach has slight
advantages regarding cost and power. Moreover, a hierarchical network can
show benefits in cost and power consumption compared to a network without
restrictions in routing at high traffic loads.
© 2011 IEEE
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