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Doctorate thesis defense of Selma BATTI ATTIA

Doctorate thesis defense on Monday November 24th 2014, at 14h00, in Amphi I at Sup'Com

Entitled : Virtual Memory and Traffic Synchronization in All-Optical Networks

Presented by : Selma BATTI ATTIA 




Sup'Com, University of Carthage, Tunisia





Pr. Badr-Eddine BENKELFAT

Mines-Telecom Institute, Telecom SudParis, France


Pr. Houria RZIG

ENIT, University of Tunis El Manar, Tunisia


Dr. Mourad MNIF

Sup'Com, University of Carthage, Tunisia


Thesis Director

Pr. Noureddine BOUDRIGA

Sup'Com, University of Carthage, Tunisia


Thesis Co-Director

Pr. Mourad ZGHAL

Sup'Com, University of Carthage, Tunisia


Due to the important capacity provided by optical technologies, networks are converging increasingly towards these new technologies. The lack of optical buffering is a major obstacle facing all-optical communication networking. To implement switching node in all-optical networks, optical buffering is required to avoid signal conversion to electrical domain. This thesis aims to design a virtual optical memory and a traffic synchronizer for optical networks. The main objective consists in designing two all-optical buffers based on the most promising technique of recirculation loop to achieve tunable delays: the first buffer has the particularity to memorize signals for relatively a long time duration and the second has the particularity to synchronize arriving signals at the optical switching node input ports.

In the first axis, we focus on the design of an all-optical virtual memory based on recirculation loops to provide tunable optical data unit storage time. We proposed an innovating architecture based on all-optical technologies even for control part. The multi-wavelength concept is used to realize a shared memory providing important storage capacity. An analytical model is implemented and a set of simulations is done to prove the feasibility of the system. The low penalty observed shows that the system reliability is enough satisfying.

In the second axis, we focus on the design of a novel all-optical synchronizer. The proposed architecture aligns input flow on clock signal using only all-optical technologies. By adopting the multi-wavelength concept, the system efficiency can be improved by aligning several signals. The system performances were evaluated and the effects of signal circulation and system control are analyzed. Simulations show that signals synchronization may be performed with a fine sensitivity with acceptable signal distortion.

In the third axis, we propose a design of an all-optical switching node based on optical buffers. The synchronizer and the virtual memory are inserted in the switching node to demonstrate the effect of the optical buffering on switching node functions and performances.