Abstract
Due to the ever-growing network capacity demand, energy-efficient and
scalable networking solutions are needed in all networking segments. This
paper focuses on the metro segment and compares the power consumption for
four different technologies: Ethernet, Reconfigurable Optical Add-Drop Multiplexers
(ROADM), Optical Transport Networks (OTN), and an optical packet switching
(OPS) solution called Packet Optical Add-Drop Multiplexers (“POADM”),
which was recently proposed.A novel resource allocation strategy for POADM-based OPS multi-rate
rings is proposed for the first time. The multi-rate POADM ring network resource
allocation problem is shown to be NP-hard and solved using both an MILP formulation
and a heuristic. The MILP formulation and the heuristic are compared, along
with dimensioning results for Ethernet and ROADM/OTN ring networks. Results
show that multi-rate POADM rings achieve savings up to 10% with respect to
single-rate design and can be enabled by assigning a different rate to each
wavelength. Furthermore, POADM rings can be up to 5 times more energy-efficient
than Ethernet rings and 30% than ROADM rings, assuming similar network efficiencies.
© 2012 IEEE
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