Please use this identifier to cite or link to this item: http://hdl.handle.net/10321/3473
Title: Quality of transmsision aware routing and wavelength assignment algorithm for blocking minimization in translucent optical networks
Authors: Khumalo, Philani
Nleya, Bakhe
Mutsvangwa, Andrew 
Chidzonga, Richard
Keywords: Transparent optical networks;QoT aware;Lock-ing probability;Optical repeaters
Issue Date: Aug-2020
Publisher: IEEE
Source: Khumalo, P., Nleya, B., Mutsvangwa, A., Chidzonga, R. 2020. Quality of transmsision aware routing and wavelength assignment algorithm for blocking minimization in translucent optical networks Presented at: 2020 International Conference on Artificial Intelligence, Big Data, Computing and Data Communication Systems (icABCD). Available: doi:10.1109/icabcd49160.2020.9183804
Conference: 2020 International Conference on Artificial Intelligence, Big Data, Computing and Data Communication Systems (icABCD) 
Abstract: In Optical Transport networks, the optical reach is defined as the maximum distance (number of hops) a lightpath connection can span before the intelligence of the sig-nal it is carrying to unrecoverable state as a result of the degra-dation in the signal to noise power ratios. When the signal to noise ratio has degraded below a certain acceptable threshold, regeneration is necessary. Optical Transport networks will nor-mally incorporate optical repeaters throughout to facilitate sig-nal reach for all the lightpath connection establishments. Such networks are classified as being Translucent. The role of the sparsely spaced optical repeaters is to refresh the degraded op-tical signals so that an acceptable quality of transmission (QoT) can be guaranteed by the network operator. The deployment of such units where necessary throughout the network leads to an escalation to both capital as well as operational expenditures. It is however necessary that network designers strike a balance be-tween the network operating costs versus renderable quality of service (QoS) to end users. In light of this challenge, in this pa-per we propose and analyze a QoT-Aware routing and wave-length assignment algorithm (QARWA) that seeks to minimize blocking of data bursts traversing the network. The QoT block-ing considers the effects of various linear as well as nonlinear impairments. The proposed model can be infused with other al-gorithms that attempt to calculate wavelength blocking per route and also per available layer. We also further enhance the same algorithm’s efficacy by introducing its QoT aware guar-anteed RWA (QGRWA) equivalent. The novelty of the scheme is in taking into account physical layer impairments, as well as signal quality when computing candidate routes for a given source to destination pair. The proposed algorithm’s overall promising performance is validated via analytical and simula-tion means.
URI: http://hdl.handle.net/10321/3473
DOI: 10.1109/icabcd49160.2020.9183804
Appears in Collections:Research Publications (Engineering and Built Environment)

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