Prof. Badr-Eddine Benkelfat Profile

Prof. Badr-Eddine Benkelfat

at Télécom SudParis

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Author

Publications (15)

Proceedings Article | 7 March 2014 Paper

Spectral and temporal phase measurement by optical frequency-domain reflectometry

Bruno Robillart, Cosimo Calò, Abdoulaye Fall, François Lamare, Yaneck Gottesman, Badr-Eddine Benkelfat

Proceedings Volume 8961, 896134 (2014) https://doi.org/10.1117/12.2039600

KEYWORDS: Phase measurement, Optical filters, Interferometers, Phase shifts, Filtering (signal processing), Doppler effect, Terahertz radiation, Phase shift keying, Modulation, Reflectometry

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The capability of measuring the spectral and temporal phase of an optical signal is of fundamental importance for the advanced characterization of photonic and optoelectronic components, biochemical sensors, structural monitoring sensors and distributed sensor networks. To address this problem, several techniques have been developed (frequency-resolved optical gating (FROG), spectral phase interferometry for direct electric-field reconstruction (SPIDER), stepped-heterodyne technique, laser Doppler vibrometry (LDV) and Doppler optical coherence tomography (OCT)). However, such techniques often lack of versatility for the mentioned applications. Swept-wavelength interferometric techniques and, among these, optical frequency-domain reflectometry (OFDR) are flexible and highly sensitive tools for complete characterization of amplitude and phase of target devices. In this work, we investigate the spectral and temporal phase measurement capabilities of OFDR. Precise characterization of spectral phase information is demonstrated by retrieving the phase response of a commercial optical filter, the Finisar Waveshaper 1000 S/X, programmable in attenuation and phase over C+L band (1530– 1625 nm). The presented results show accurate retrieval of group delay dispersion (GDD) and discrete phase shift as well as filter attenuation profile. Although some intrinsic accuracy limitations of OFDR phase measurements may be encountered (and herein specified), we show that information encoded in OFDR reflectogram data is very rich when adequately exploited. In addition to previously published results, we demonstrate the high sensitivity of the technique to Doppler effects. From practical point of view, such sensitivity can be beneficially exploited for the characterisation of dynamical aspects of samples under test. Unlike LDV, OFDR allows the simultaneous retrieval of the temporal position of several localised reflecting target along the beam path. All these aspects make OFDR a highly promising candidate for the study of both static and dynamic aspects of complex photonic components or to probe a parallel sensor network, as needed for future applications.

Proceedings Article | 29 April 2013 Paper

Adapted all-numerical correlator for face recognition applications

M. Elbouz, F. Bouzidi, A. Alfalou, C. Brosseau, I. Leonard, B.-E. Benkelfat

Proceedings Volume 8748, 874807 (2013) https://doi.org/10.1117/12.2014383

KEYWORDS: Fourier transforms, Optical correlators, Facial recognition systems, Phase only filters, Image filtering, Far-field diffraction, Composites, Detection and tracking algorithms, Field emission displays, Target detection

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Proceedings Article | 3 May 2012 Paper

2D real-time arithmetic operations using optical coherence properties: image processing applications

B.-E. Benkelfat, S. El Wardi, M. Zghal, A. Alfalou

Proceedings Volume 8397, 83970D (2012) https://doi.org/10.1117/12.918892

KEYWORDS: Coherence (optics), Multiplexing, Modulation, Signal processing, Interferometers, Image processing, Computer programming, Light, Electro optics, Spatial light modulators

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Proceedings Article | 23 April 2012 Paper

Towards all-numerical implementation of correlation

A. Alfalou, C. Brosseau, B.-E. Benkelfat, S. Qasmi, I. Léonard

Proceedings Volume 8398, 839809 (2012) https://doi.org/10.1117/12.919378

KEYWORDS: Fourier transforms, Far-field diffraction, Optical correlators, Phase only filters, Field programmable gate arrays, Composites, Optical coherence tomography, Detection and tracking algorithms, Optical pattern recognition, Databases

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Proceedings Article | 22 September 2011 Paper

Multiplex coding for real-time optical image processing

S. Elwardi, B.-E. Benkelfat, M. Zghal

Proceedings Volume 8167, 81671Y (2011) https://doi.org/10.1117/12.899570

KEYWORDS: Image processing, Coherence (optics), Signal to noise ratio, Multiplexing, Modulation, Computer programming, Image quality, Signal processing, Liquid crystals, Spatial light modulators

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Proceedings Article | 5 August 2009 Paper

Effect of depth etching on Bragg reflectors realized by focused ion beam in Ti:LiNbO3 waveguide

K. Ghoumid, R. Ferriere, B.-E. Benkelfat, G. Ulliac, R. Salut, J.-Y. Rauch, T. Gharbi

Proceedings Volume 7386, 738613 (2009) https://doi.org/10.1117/12.839692

KEYWORDS: Etching, Waveguides, Transmittance, Ion beams, Reflectivity, Fiber Bragg gratings, Modulation, Reflectors, Lithium niobate, Sputter deposition

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Proceedings Article | 7 January 2008 Paper

Polarization dependence of the effect of external optical feedback on semiconductor lasers

Q. Zou, S. Azouigui, A. Ramdane, B.-E. Benkelfat

Proceedings Volume 6824, 682412 (2008) https://doi.org/10.1117/12.755377

KEYWORDS: Semiconductor lasers, Composites, Polarization, Crystals, Quartz, Laser crystals, Fabry–Perot interferometers, Polarizers, Mirrors, Refractive index

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Proceedings Article | 7 February 2007 Paper

A novel approach for the analysis of Ti-PE:LiNbO3 distributed parameter waveguides

Georges Bou Abboud, Badr-Eddine Benkelfat, Nicolas Grossard

Proceedings Volume 6468, 646809 (2007) https://doi.org/10.1117/12.699234

KEYWORDS: Waveguides, Titanium, Diffusion, Reflectivity, Refractive index, Integrated optics, Dispersion, Phase shifts, Fabrication, Optical filters

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Proceedings Article | 7 July 2005 Paper

Continuously tunable single-frequency fiber laser based on novel hybrid Šolc filter

B.-E. Benkelfat, Y. Gottesman, R. Hamdi, M. Chikhbled

Proceedings Volume 5840, (2005) https://doi.org/10.1117/12.608076

KEYWORDS: Optical filters, Fiber lasers, Tunable filters, Tunable lasers, Liquid crystals, Birefringence, Electro optics, Wavelength tuning, Polarization, Optical amplifiers

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Proceedings Article | 15 September 2004 Paper

Spontaneous emission in emitting-layer-embedded one-dimensional photonic bandgap structures

Qin Zou, Abderrahim Ramdane, Robert Frey, Badr-Eddine Benkelfat

Proceedings Volume 5450, (2004) https://doi.org/10.1117/12.543884

KEYWORDS: Electromagnetism, Optical components, Dielectrics, Dispersion, Refractive index, Gallium arsenide, Nanostructures, Systems modeling, Complex systems, Refraction

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Proceedings Article | 19 November 2003 Paper

Tunable wavelength liquid crystal Bragg reflector working in (1530-1570) nm band

Serge Meyer, Badr-Eddine Benkelfat, Qin Zou

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.527739

KEYWORDS: Liquid crystals, Reflectors, Birefringence, Transmittance, Shape memory alloys, Mirrors, Glasses, Mirror structures, Polarization, Light wave propagation

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Proceedings Article | 5 September 2002 Paper

Modal reshaping of the electromagnetic mode density near band edges in finite one-dimensional periodic photonic bandgap structures

Qin Zou, Abderrahim Ramdane, Badr-Eddine Benkelfat

Proceedings Volume 4923, (2002) https://doi.org/10.1117/12.481711

KEYWORDS: Electromagnetism, Gallium, Aluminum, Electromagnetic radiation, Dielectrics, Dispersion, Refractive index, Electromagnetic scattering theory, Mirrors, Second-harmonic generation

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Proceedings Article | 17 October 2001 Paper

Intracavity optical birefringent filters

Qin Zou, Badr-Eddine Benkelfat

Proceedings Volume 4581, (2001) https://doi.org/10.1117/12.445063

KEYWORDS: Optical filters, Electronic filtering, Liquid crystals, Fabry–Perot interferometers, Modulators, Birefringence, Polarizers, Dense wavelength division multiplexing, Reflectivity, Polarization

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Proceedings Article | 1 September 2000 Paper

Hybrid liquid crystal Solc/Fabry-Perot filter for wavelength demultiplexing: optimum design parameters

Serge Meyer, Badr-Eddine Benkelfat, Qin Zou

Proceedings Volume 4075, (2000) https://doi.org/10.1117/12.397935

KEYWORDS: Liquid crystals, Polarization, Molecules, Optical filters, Transmittance, Shape memory alloys, Fabry–Perot interferometers, Optical spheres, Electronic filtering, Tunable filters

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Proceedings Article | 24 May 2000 Paper

Incoherent multiplex optical correlator for pattern recognition

El-Houssine Horache, Badr-Eddine Benkelfat, Qin Zou, Vincent Laude

Proceedings Volume 4089, (2000) https://doi.org/10.1117/12.386846

KEYWORDS: Modulation, Optical correlators, Coherence (optics), Spatial light modulators, Signal processing, Optical pattern recognition, Image filtering, Light sources, Multiplexing, Optical filters

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Showing 5 of 15 publications

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