Abstract
High energy efficiency is expected to become a mandatory design criterion in
optical networks of the future. This paper investigates schemes for enhancing the energy
efficiency of core optical networks based on multicarrier transmission. Such networks of
the future will incorporate flexible techniques, namely: 1) adaptive modulation and
coding, 2) flexible spectrum allocation, 3) wavelength conversion, and 4) traffic
grooming. We investigate the problem of energy efficient routing and spectrum allocation
in core optical networks incorporating these flexible techniques. We propose a heuristic
solution that provides an energy minimized design of long-haul optical networks by
avoiding under-utilization of network resources such as optical fibers, transponders,
and amplifiers. A fixed architecture that does not employ the aforementioned flexible
techniques is used as a benchmark for comparison. The numerical results in the west
European (24-node US) core optical network show that the energy efficiency of the
flexible architecture can outperform the fixed architecture by a factor of 4.2 (6.4) for
low and 1.8 (1.9) for high traffic demands, respectively.
© 2014 IEEE
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