Abstract
In transparent optical networks, the signal transmission is degraded by
optical layer physical impairments. Therefore, lightpaths may be blocked due
to unacceptable quality of transmission (QoT). Among physical impairments,
polarization mode dispersion (PMD) is a detrimental effect which has
stochastic characteristics. Moreover, PMD depends on time-variant factors,
such as the temperature and the fiber stress.When implementing a dynamic GMPLS-controlled transparent optical network,
the GMPLS protocol suite must take into account physical impairment
information in order to establish lightpaths while guaranteeing the required
QoT. In the literature, solutions for QoT-aware GMPLS control plane commonly
consider that the effects of PMD on QoT are not detrimental when the average
differential group delay (DGD) does not exceed a threshold. However, even
with a high average DGD, it may happen that the instantaneous DGD is not
detrimental. Additionally, given PMD temporal correlation properties, once
that the instantaneous DGD is not detrimental, it continues to be not
detrimental within considerable time ranges. Therefore, more accurate models
can be implemented in the GMPLS control plane to account for PMD.In this paper we propose a novel lightpath provisioning scheme based on a
PMD prediction model which accounts for PMD temporal correlation properties.
The proposed PMD-temporal-correlation (PTC) based lightpath provisioning
scheme is compared with a scheme based on a classical PMD model. Simulation
results show that PTC scheme significantly reduces the lightpath blocking
probability with respect to the classical scheme. Moreover, PTC demonstrates
that, by considering PMD temporal correlation, the transparency domain size
can be increased, since paths that would be rejected by a classical model
can be actually accepted within specific time ranges.
© 2010 IEEE
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