Abstract
This paper presents the design and evaluation of our optical broadcast-and-select
wavelength-routed network architecture that uses a centralized multicarrier light source
(C-MCLS). The large number of optical carriers/wavelengths generated by the C-MCLS are
distributed to all edge nodes (ENs), which select and modulate wavelengths to realize upstream
transmission. To utilize wavelengths efficiently, we introduce a framework for wavelength
allocation and selection (WAS). Both static and dynamic schemes are adopted for WAS and their
implementations are shown. By using fixed or tunable band pass filters and periodic arrayed
waveguide grating demultiplexers, wavelengths are selected and utilized by ENs in a static or
dynamic manner. After considering the design parameters used in the implementations,
wavelength allocation procedures are described. We evaluate the cost, power consumption and
network performance of the proposed network. Numerical results show that it offers greatly
reduced cost and power consumption compared to the conventional one when the number of
required access wavelengths at EN becomes large. We delineate its applicable areas through
cost comparisons. Blocking probabilities of static and dynamic schemes are analyzed to
evaluate network performance. Numerical results show that by choosing appropriate design
parameters, the dynamic scheme offers about 25% increase in admissible offered load under the
specified blocking probability, compared to the static scheme. This indicates that the dynamic
scheme makes the proposed network more robust against traffic fluctuations.
© 2009 IEEE
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