Abstract
Wavelength routing algorithms (WRAs) aware of Physical layer impairments
(PLIs) have been proposed in order to manage the establishment of optical
paths in wavelength-switched optical networks. However, if optical nodes incorporate
regenerators/wavelength converters, PLI-aware WRAs should be devised in order
to incorporate error accumulation in the signal in the PLI estimation and
relaxation of the wavelength continuity constraint in the path calculation.
In this paper, we utilize a new bit error rate performance estimation in combination
with the PLI-aware WRA in order to systematically investigate the role of
regeneration and wavelength conversion in optical networks. Based on the outcomes
of the study, we also propose a path establishment algorithm that is based
on the “instant” physical properties of the path and can dynamically
adapt to the network state. This is proven beneficial as far as the blocking
performance is concerned as it circumvents the weaknesses that appear in the
traditional shortest distance path establishment algorithms in a PLI-aware
environment that operates without the wavelength continuity constraint.
© 2012 IEEE
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