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In this paper, the optimization tool based on Genetic Algorithms (GAs) to improve the different parameters such as the Attenuation and backscatter coefficients of single mode optical fibre (SMF) is proposed. The method of experimental study which is based on the use of an Optical Time Domain Reflectometer (OTDR) to measure and locate different events that occur in an optical fibre in real time is exploited. The experimental results have been compared with theoretical results in order to validate the proposed methods of modelling.

With the evolution of cellular networks and the panoply of different services offered, it is crucial for mobile network operators to start planning with procedures that are simple, inexpensive and robust. In this paper we develop and present a methodology for the planning and dimensioning of UMTS network dedicated to the region of Bejaia in Algeria. The work focuses on the UTRAN since the implementation of this represents a majority part of the total investment in infrastructures. We present here a network dimensioning methodology, oriented towards the optimization of the radio coverage. Atoll prediction tool is used for simulations, where the most appropriate propagation model for this study was developed using calibration techniques. The results obtained show the practicality of this approach in a heterogeneous environment composed of four areas namely, dense urban, urban, suburban and rural.

This research paper focuses and examines the quantum key distribution using the BB84 protocol in the case of encoding on the single-photon polarization and shows the influence of optical components parameters on the quantum key distribution. We also introduce the Quantum Bit Error Rate (QBER) to better interpret our results and show its relationship with the intrusion of the eavesdropper called Eve on the optical channel to exploit these vulnerabilities.