ARMAND VEDADI Address : 37 Grande Rue 25000 Besançon FRANCE
Email :
[email protected] Work Phone : (33) 3 81 66 64 26 Cell : (33) 6 66 35 10 79
Nationality : French US VISA: Permanent Resident Marital Status : single Date of birth : 02/17/1980
EDUCATION: 2004-2007 : PhD in Engineering Science, Université de Franche Comté, Besançon (France) Research Area: Nonlinear optics, Fiber Communication Systems, Optical Fibers. 2003-2004 : M.Sc “High Frequency Telecommunication Systems”, Université de Marne la Vallée, Champs-sur-Marne (near Paris, France) Relevant courses : Communication systems, electromagnetic modeling, Radio frequency & microwave components & devices, optoelectronic devices . 2000-2004 : M.Sc .Télécom INT (Institut National des Télécommunications), Evry (near Paris, France) Relevant courses: Radio & high Frequency Systems, Electronics & Systems, Optical communications, Signal, Information processing, Computer Science (UML, UNIX, JAVA, C , C++ ...), Networks (TCP/IP, LAN, Ethernet,...) 1998-2000 : Preparation for national competitive entrance exams to French "grandes écoles".Lycée Charlemagne, Paris IV Main courses: Mathematics, Physics & Computer Science . 1995-1998 : Scientific Baccalaureate (specializing in Physics, Biology and Mathematics), with honors. (US equivalent: high school diploma plus one year.) Lycée M.L. King Bussy saint Georges (near Paris, France)
RESEARCH EXPERIENCE (Summary): October 2004-September 2007
February 2004-July 2004
July 2002-September 2003
Femto-ST, Laboratoire d’Optique P.M Duffieux (LOPMD) CNRS-UMR6174, Université de Franche-Comté, Besançon (FRANCE) Ph. D. thesis: Parametric signal processing and amplification for fiber communications systems Supervisors: Hervé Maillotte, Thibaut Sylvestre and Eric Lantz Laboratoire de Photonique et de Nanostructures (LPN), CNRS-UPR20, Marcoussis (FRANCE) M.Sc. Degree internship in all optical wavelength conversion using saturation of Electro-Absorption Modulators (EAM) Supervisor: Abderrahim Ramdane Advanced Telecommunication Research Institute (ATR), Keihanna Science City (JAPAN) End of study internship in end-user application for wireless Ad-Hoc Networks Supervisor: Shizuke Shimogawa
COMPUTER SKILLS: •Operating Systems : UNIX, Windows 9X/NT/XP •Languages : Matlab, Java, C, C++, Caml , assembling, SQL, HTML, JAVASCRIPT •Software : Microsoft Office, Adobe Illustrator, Latex, Mathematica
LANGUAGE SKILLS: French : mother tongue Persian: mother tongue English: fluent. (Cambridge First Certificate A Level)
Japonese: good knowledge (3-kyü level) German : basic knowledge Spanish : beginner
EXTRA CURRICULAR ACTIVITIES: Mountain skiing, Climbing, Music, Basketball, Swimming, Acting
RESEARCH EXPERIENCE (Detail): Ph. D. Thesis: Parametric signal processing and amplification for fibre communications systems. Fiber Optical Parametric Amplifiers (FOPAs) have great potential for signal processing and amplification thanks to the wide gain bandwidth and low noise they can theoretically provide. However, different phenomena have been found to impair FOPA performance in practice. The aim of my Ph. D. Thesis is to study both theoretically and experimentally new means to avoid those impairments and open up the path for FOPA deployment. For this purpose, I modeled two pumps FOPAs by taking into account the pumps phase modulation (PM) needed to avoid stimulated Brillouin backscattering (SBS). I studied in particular the gain distortions caused by PM on a signal with frequency located between the two pumps frequencies and showed that the distortions are almost cancelled when the pumps are out-of-phase modulated. Then, I built experimentally a two pumps FOPA using a specially designed Y-junction phase modulator for synchronized out-of-phase modulation and coupling of the pumps. Thanks to collaboration with the Swiss Federal Institute of Technology (EPFL) in Lausanne, I carried out the first distributed measurement of the parametric gain along the amplifying fibre in single pump FOPAs by using Brillouin optical time-domain analysis. I also performed a collaboration work with the French Commissariat à l’énergie atomique (Atomic Energy Center, CEA). Based on requirements, I studied the performance of singlepump FOPAs to be built in a loop for signal replication in the [1µm-1.1µm] wavelength domain. Furthermore, design rules were given for experimental implementation using photonic crystal fiber. I also participated in the generation of ultra-wide and flat supercontinuum using pseudocontinuous partially coherent fiber lasers. In particular, by multiplexing two Raman fiber lasers (RFL), we showed that it is possible to significantly enhance the continuum generated by the RFL located in the anomalous dispersion region thanks to distributed Raman amplification. Through theses works, I acquired good knowledge of the different nonlinear phenomena occurring in optical fibers, such as the Kerr effect, the Brillouin and the Raman scattering. I have become acquainted with modeling wave propagation in a Kerr nonlinear medium by solving numerically the nonlinear Schrödinger equation (NLSE) using the split step Fourier method. I can also derive analytical models from simplified NLSE. Finally, I have developed strong skills in FOPA related experiments. I am currently writing my Ph. D. thesis, which I intend to defend in late September. M. Sc. Internship: High bit-rate wavelength conversion using Electro-absorption modulator. The aim of this internship was to study electro-absorption modulator (EAM) for all-optical wavelength conversion. Indeed, when a strong pulse is injected into the EAM waveguide, its absorption saturates and hence the device becomes transparent to any other propagating probe, so that an on-bit “1” is effectively copied from the pump wavelength to the probe wavelength. I characterized several EAMs and demonstrated that, by taking advantage of the Stark effect, EAMs may potentially achieve 40GBits/s all-optical wavelength conversion. I acquired knowledge in optoelectronics and semiconductor physics. I developed experimental skills for manipulation of microstructure devices, and characterization of picoseconds pulses using Streak camera.
M. Sc. Internship: end-user application for wireless Ad-Hoc Networks. The aim of this internship was to design user oriented applications that allows for a more comfortable use of handheld devices. The ultimate aim of the research project was to establish new rules for designing systems that would be natural for people to use. Within this project, I designed and implemented an application that allows users to see the content of their handheld devices on a bigger screen with a better resolution. I implemented this application using both the infrared and wi-fi communications links on both PC and PDA platforms. I also gained good hands-on experience of server-client programming and driver programming.
PUBLICATIONS: Publications in refereed scientific journals: •
"All-optical wavelength conversion by EAM with shifted bandpass filter for high bit-rate networks", N.E. Dahdah, R. Coquille, B. Charbonnier, E. Pincemin, C. Kazmierski, J. Decobert, A. Vedadi, G. Aubin, and A. Ramdane, IEEE Photon. Technol. Lett., Volume: 18, Issue: 1, 61-63 (January 2006)
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"Supercontinuum generation using continuous-wave multiwavelength pumping and dispersion management," T. Sylvestre, A Vedadi, and H. Maillotte, F. Vanholsbeeck, and S. Coen, Optics letters, Vol. 31, N°13, pp-2036-2038 (June 2006). "Theoretical study of gain distortions in two-pump fiber optical parametric amplifiers," A. Vedadi, A. Mussot, E. Lantz, H. Maillotte and T. Sylvestre, Opt. Comm., Volume: 267, Issue: 1, 244-252 (November 2006) "Brillouin Optical Time Domain Analysis of Fiber Optic Parametric Amplifiers," A. Vedadi, D. Alasia, E. Lantz, H. Maillotte, L. Thévenaz, M. González-Herráez, and T. Sylvestre, IEEE Photon. Technol. Lett., Volume: 19, Issue: 3, 179-181 (February 2007).
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Communications at refereed scientific international conference: •
“Designing a Wireless Ad-hoc System to Use Established Display,” S. Shimogawa, A. Vedadi, K. Ohtawara, K. Shinjo, In 8th International Workshop on Mobile Multimedia Communications/MOMUC’2003 (October, Munich, Germany).
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"Continuum generation in a dispersion-shifted fiber using one or two continuous-wave Raman fiber lasers," T. Sylvestre, A. Vedadi, A. Mussot, E. Lantz and H. Maillotte, In Nonlinear Guided Waves and Their Applications/OSA'2005, paper ThB10 (September 6-9, Dresden, Germany).
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"Brillouin Optical Time Domain Analysis of Fiber Optic Parametric Amplifiers," A. Vedadi, D. Alasia, E. Lantz, H. Maillotte, L. Thévenaz, M. González-Herráez, and T. Sylvestre, In European Conference of Optics Communications/ECOC'2006, paper Th1.3.7 (September 2428, Cannes, France). "Fiber Optical Parametric Amplifier Based on a Novel LiNbO3 Synchronized double Phase Modulator", A. Vedadi, J-C. Beugnot, E. Lantz, H. Maillotte, J. Hauden, and T. Sylvestre, In Optical Fiber Communication conference/OFC'2007, paper OWQ2 (March 25-28, Anaheim, California, USA)
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Communications at refereed scientific national conference: •
"Etude de Modulateurs à Electroabsorption pour la Conversion de Longueur d’Onde à Haut Débit," A. Vedadi, N. El Dahdah, K. Merghem, G. Aubin, C. Kazmierski, A. Shen, J.
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Decobert, J. Landreau, Y. Gottesman, B-E. Benkelfat, A. Ramdane, Journées nationales d'optique guide/JNOG'2004, paper 506 (October 25-27, Paris, France). "Mesure distribuée du gain paramétrique par analyse Brillouin dans le domaine temporel," A. Vedadi, D. Alasia, E. Lantz, H. Maillotte, L. Thévenaz, M. Gonzáles-Herráez, T. Sylvestre, Journées nationales d'optique guide/JNOG'2006, poster A-Th3-9 (November , Metz, France).
