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Reliability of FSO systems in Sahel region: a case study of the major city of Dakar

Free Space Optical communications (FSO) are becoming an attractive option for high data rate transmission, for metro networks access, mobile and cellular networks backhauling [1]. The FSO are easy to install , and could be deployed within less than one week compared to optical fiber that could take one to two years. In addition, FSO is very low cost compared to wired technologies [2]-[4]. In Sahel, telecommunications systems are emerging with deployment of metro core access (MCA) in optical fiber and Digital Subscriber Lines (DSL) in regard to provide high data rate transfer to users for voice and data services, in dense regions and even in rural areas; but these two technologies are still far to the so called last mile, that we identify here by end user, like home and enterprise users. In addition they are used to connect backhauls of the 3G et 4G mobile cellular networks by tree types of connection: by direct connection of base station or base station controller to the metro access, by connection via radiofrequency medium to the metro core access and by connection via the DSL lines to the metro core access. However in all connecting scenario, the main problem is the distance of connection still being up to 5 km, in most cases. Proposing FSO as reliable technology for Sahel telecommunications development and access, we have to study their long distance availability and reliability by taking in consideration another fact which is the weather conditions. In this work we use meteorological data recorded from ten years to analyze the availability of existing FSO systems. We also propose an adequate power margin for future FSO systems, in regards to establish a long distance link with free space optical system. The main method we use for that work is the Kruse method for estimating the extinction coefficient.

Auteur(s) : Cheikh A. B. Dath, Modou Mbaye, Ndeye Arame Boye Faye, Ahmadou Wague
Pages : 368-371
Année de publication : 2015
Revue : International Journal of Engineering Science and Innovative Technology (IJESIT)
N° de volume : Volume 4, Issue 1
Type : Article
Statut Editorial : publie
Mise en ligne par : BOYE Ndèye Arame