Impairment aware routing with service differentiation in heterogeneous WDM networks
2009 (English)In: Network Architectures, Management, and Applications VII, SPIE - International Society for Optical Engineering, 2009, 763307- p.Conference paper (Refereed)
In transparent Wavelength Division Multiplexing (WDM) networks, the signal is transported from source to destination in the optical domain through all-optical channels, or lightpaths. A lightpath may traverse several fiber segments and optical components that in general degrade the optical signal. This effect introduces the need for considering physical layer impairments during the connection-provisioning phase. Physical layer impairments can be divided into linear and non-linear. Both types of impairments are highly dependent on the fiber characteristics, which in turn are sensitive to length, temperature and age. A close look at the fiber infrastructure of today's network operators reveals a situation where old and newly deployed fibers coexist in the network. This heterogeneous fiber plant presents a challenge. A tradeoff should be found between the QoS requirements of connection requests and the use of the available (old and new) network resources. This calls for a provisioning mechanism able to adapt to the various fiber composition scenarios. In parallel, given the need for service differentiation, the authors recently proposed an Impairment Constraint Based Routing (ICBR) algorithm, referred to as ICBR-Diff, supporting differentiation of services at the BER (Bit Error Rate) level in a network with a homogeneous fiber infrastructure. In this paper the ICBR-Diff algorithm is extended to heterogeneous network; particularly, it is evaluated in WDM networks with fiber links having varying Polarization Mode Dispersion characteristics, i.e., with old and new fiber coexisting. Simulation results show that the ICBR-Diff algorithm exhibits high adaptability in a heterogeneous fiber composition scenario. This translates into improved performance in terms of blocking probability, when compared to traditional impairment aware routing algorithms.
Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2009. 763307- p.
, Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277-786X ; 7633
All-optical, BER (bit error rate), Constraint based routing, Deployed fiber, Differentiation of services, Fiber characteristics, Fiber composition, Fiber links, Fiber plants, Fiber segments, Light path, Network operator, Network resource, Non-linear, Optical components, Optical domains, Optical signals, Physical layers, Polarization modes, QoS requirements, Service differentiation, Simulation result, Wavelength division multiplexing networks, WDM networks
Telecommunications Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-152765DOI: 10.1117/12.852076ScopusID: 2-s2.0-73849140892ISBN: 978-081948035-4OAI: oai:DiVA.org:kth-152765DiVA: diva2:755171
Network Architectures, Management, and Applications VII, 2 November 2009 through 6 November 2009, Shanghai, China
QC 201410142014-10-142014-10-012014-10-14Bibliographically approved