Abstract
It is widely believed that dynamic operation of wavelength-routed optical
networks will help overcome the inefficiencies of static allocation in terms
of wavelength utilization. In this paper, this hypothesis is reviewed. The
wavelength requirements of dynamic wavelength-routed optical networks are
quantified and compared to static routing. To do so, new analytical and algorithmic
lower bounds for the wavelength requirements of dynamic networks are proposed.
They are used to evaluate the optimality of the already proposed algorithms
whose wavelength requirements are quantified - by means of simulation- with
and without the wavelength continuity constraint, as well as for uniform and
nonuniform traffic demand. Results show that, without wavelength conversion
capability, the benefit of dynamic wavelength-routed optical networks is not
significant: lower wavelengths requirements than static networks are achieved
only at low traffic loads $(<0.3-0.4)$. In wavelength convertible networks instead, dynamic operation
leads to lower wavelength requirements than static operation over a wide traffic
load range $(<0.7-0.8)$,
making dynamic operation attractive in this type of network. Under nonuniform
traffic it was found that dynamic operation achieves slightly higher wavelength
savings than in the uniform traffic case. But the savings were not high enough
as to impact on results of the uniform traffic case. These results can aid
network operators in the design and optimization of optical WDM networks.
© 2008 IEEE
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