Browsing by Author "Dridi, Kais"
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Item Optical generation of UWB signal : a comparative study(Institute of Electrical and Electronics Engineers Inc., 2007) Dridi, Kais; Hamam, HabibIn this study, we present an overview on recent existing methods to generate UWB signals. Given the increasing interest in the UWB over optical fiber, special attention will be devoted to optical methods for generating UWB signals. These methods aim at ensuring a good integration of such radio signals over optical fiber with a very low cost. Some hybrid electro-optical methods will be covered before handling "all-optical" approaches. Particular attention will be given to the seven following methods: Chromatic Dispersion based approach, FBG-based approach, Optical impulse radio system, Electrooptical intensity modulator based method, Method based on XPM in an SOA, Optical FSK based method, and Spectral shaping and dispersion-induced frequency to time conversion based technique. For illustration some results will be presented. © 2007 IEEE.Item Space based generation signal for UWB over fiber(Institute of Electrical and Electronics Engineers Inc., 2007) Dridi, Kais; Hamam, HabibWe propose a novel approach for generating UWB signals for propagation over the optical fiber. This technique uses the effect of chromatic dispersion in single mode fibers, expressed by the Schrodinger equation. After duplicating the input pulse signal, the interference of two replica, that are unequally dispersed, results in a second order derivate of the input signal and therefore in an UWB pulse carried by an optical wave. Gaussian doublet like signals can easily be generated. This enables providing several gigahertz bandwidths for applications in high-bit-rate UWB wireless communications. New experimental schemes are given as a proof for our new approach. This new method allows not only generating UWB pulses but also distributing them over optical fibers with a low integration cost. © 2007 IEEE.Item Time based generation signal for UWB over fiber(Institute of Electrical and Electronics Engineers Inc., 2007) Dridi, Kais; Hamam, HabibWe propose a new all optical fiber based Ultra-wideband (UWB) pulse generation for propagation over optical fibers (UWBoF). The approach is based on time delay. The technique consists in duplicating the input signal, shifting the two replicas in time and inverting one of them (phase opposition). By recombining the shifted replicas, we obtain the first derivative order of the initial pulse. Thus, monocycle like pulses can be generated. Several gigahertzs of bandwidths can be freely obtained fulfilling there the requirements of the Federal Communication Commission (FCC). New experimental scheme and results are presented. Using this cost-effective method, UWB signals can be easily generated and propagated over optical fiber before radiating them. © 2007 IEEE.