Abstract
In the evolution from opaque networks, using 3R regenerators and OEO
conversions for every wavelength channel, towards transparent networks,
relying on end-to-end all-optical connections, translucent networks is
considered as an intermediate step. A translucent network is a
cost-efficient infrastructure between opaque and transparent networks, that
aims at attaining an adequate trade-off between network construction cost
(i.e., due to the high cost of 3R regenerators) and the service provisioning
performance (i.e., end-to-end optical signal quality). This article
addresses the dynamic provisioning of connections within a GMPLS-enabled
translucent wavelength switched optical network with sparse 3R regenerators.
To this end, translucent-oriented GMPLS protocol extensions are proposed to,
on the one hand, disseminate required per node regenerator availability and
OSNR-related link and node attributes and, on the other hand, allocate
regenerator resources when setting up connections. An on-line OSNR-based
impairment-aware RWA algorithm is devised to compute routes aiming at
satisfying two constraints: the wavelength continuity constraint and the
end-to-end optical signal quality. If either constraint cannot be satisfied,
available regenerators along the route are used. To the best of our
knowledge, the novelty and progress of this work is that, for the first
time, both the proposed translucent GMPLS protocol enhancements and the
performance of the RWA algorithm are combined within an experimental control
plane network scenario (CTTC's ADRENALINE testbed). This allows validating
and evaluating the feasibility of the described translucent GMPLS routing
strategy when being potentially deployed into real WSON networks. Several
configurations with numbers of 3R regenerators and wavelength channels per
link, are experimentally evaluated and compared mainly in terms of the
connection blocking probability. Although concrete details about the
measured average setup delay are also discussed.
© 2010 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription