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Statistical Approach for Fast Impairment-Aware Provisioning in Dynamic All-Optical Networks
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).ORCID iD: 0000-0002-5636-9910
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2012 (English)In: Journal of Optical Communications and Networking, ISSN 1943-0620, E-ISSN 1943-0639, Vol. 4, no 2, 130-141 p.Article in journal (Refereed) Published
Abstract [en]

Physical layer impairments (PLIs) need to be considered in the routing and wavelength assignment (RWA) process of all-optical networks to ensure the provisioning of good quality optical connections (i.e., lightpaths). A convenient way to model the impact of PLIs on the signal quality is to use the so-called Q-factor. In a dynamic provisioning environment, impairment-aware RWA (IA-RWA) algorithms include Q-factor evaluation in their on-line decisions on whether to accept a connection request or not. The Q-factor can be computed in either an approximated or an exact way. IA-RWA algorithms using an approximated Q-factor estimation (i.e., worst case) can be very fast and allow for a short setup delay. However, connection request blocking can be unnecessarily high because of the worst-case assumption for the Q-factor parameters. In contrast, an exact Q-factor computation results in a better blocking performance at the expense of a longer setup delay, mainly due to the time spent for the Q-factor computation itself. Moreover, an exact Q-factor approach requires extensions of the generalized multi-protocol label switching suite. To overcome these problems, we propose a statistical approach for fast impairment-aware RWA (SAFIR) computation. The evaluation results reveal that SAFIR improves the blocking probability performance compared to the worst-case scenario without adding extra computational complexity and, consequently, without increasing the connection setup delay.

Place, publisher, year, edition, pages
2012. Vol. 4, no 2, 130-141 p.
Keyword [en]
All-optical networks, Cross-phase modulation (XPM), Impairment-aware RWA
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-91264DOI: 10.1364/JOCN.4.000130ISI: 000300397900007Scopus ID: 2-s2.0-84858644132OAI: oai:DiVA.org:kth-91264DiVA: diva2:509049
Funder
ICT - The Next Generation
Note

QC 20150629

Available from: 2012-03-12 Created: 2012-03-12 Last updated: 2017-12-07Bibliographically approved

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Monti, PaoloWosinska, Lena

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