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6 results on '"Optical Sciences Group (OSG)"'

1. Modulation Instability and Phase-Shifted Fermi-Pasta-Ulam Recurrence

Author

Kimmoun, O., Hsu, H.C., Branger, H., Li, M. S., Chen, Y. Y., Kharif, C, Onorato, M., Kelleher, Edmund J. R., Kibler, Bertrand, Akhmediev, N., Chabchoub, A., Institut de Recherche sur les Phénomènes Hors Equilibre (IRPHE), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), National Cheng Kung University (NCKU), Dipartimento di Fisica [Torino], Università degli studi di Torino (UNITO), Femtosecond Optics Group (FOG), Department of Physics [Imperial College London], Imperial College London-Imperial College London, Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] (LICB), Université de Bourgogne (UB)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS), Optical Sciences Group (OSG), Research School of Physics and Engineering [Canberra} (RSPE), Australian National University (ANU)-Australian National University (ANU), The University of Tokyo (UTokyo), Aix-Marseille Université, National Cheng Kung University, Universita degli Studi di Torino, Imperial College London, Laboratoire Interdisciplinaire Carnot de Bourgogne, Australian National University, Marine Technology, Department of Mechanical Engineering, Aalto-yliopisto, Aalto University, Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Università degli studi di Torino = University of Turin (UNITO), Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), and Université de Technologie de Belfort-Montbeliard (UTBM)-Université de Bourgogne (UB)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nonlinear optics, Fluid dynamics, Fluid Dynamics (physics.flu-dyn), FOS: Physical sciences, Physics - Fluid Dynamics, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], Pattern Formation and Solitons (nlin.PS), Nonlinear Sciences - Pattern Formation and Solitons, Nonlinear Sciences::Pattern Formation and Solitons, Article
Abstract

Instabilities are common phenomena frequently observed in nature, sometimes leading to unexpected catastrophes and disasters in seemingly normal conditions. The simplest form of instability in a distributed system is its response to a harmonic modulation. Such instability has special names in various branches of physics and is generally known as modulation instability (MI). The MI is tightly related to Fermi-Pasta-Ulam (FPU) recurrence since breather solutions of the nonlinear Schr\"odinger equation (NLSE) are known to accurately describe growth and decay of modulationally unstable waves in conservative systems. Here, we report theoretical, numerical and experimental evidence of the effect of dissipation on FPU cycles in a super wave tank, namely their shift in a determined order. In showing that ideal NLSE breather solutions can describe such dissipative nonlinear dynamics, our results may impact the interpretation of a wide range of new physics scenarios., Comment: 6 pages, 7 figures

Published
2016
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2. Hydrodynamic supercontinuum

Author

Norbert Hoffmann, Nail Akhmediev, John M. Dudley, Miguel Onorato, Amin Chabchoub, Goëry Genty, Centre of Ocean Engineering Science and Technology [Swinburne], Swinburne University of Technology [Melbourne], Department of Mechanical Engineering [Imperial College London], Imperial College London, Università degli studi di Torino (UNITO), Optics Laboratory [Tampere}, Tampere University of Technology [Tampere] (TUT), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Optical Sciences Group (OSG), Research School of Physics and Engineering [Canberra} (RSPE), and Australian National University (ANU)-Australian National University (ANU)

Subjects
Breather, FOS: Physical sciences, General Physics and Astronomy, Context (language use), 01 natural sciences, 010305 fluids & plasmas, 0103 physical sciences, Bound state, ddc:530, 010306 general physics, Physik [530], Nonlinear Sciences::Pattern Formation and Solitons, Technik [600], Envelope (waves), Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Fluid Dynamics (physics.flu-dyn), Physics - Fluid Dynamics, Surface gravity, Supercontinuum, Nonlinear system, Nonlinear Sciences::Exactly Solvable and Integrable Systems, Quantum electrodynamics, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, ddc:600, Doppler broadening
Abstract

We report the experimental observation of multi-bound-soliton solutions of the nonlinear Schrödinger equation (NLS) in the context of hydrodynamic surface gravity waves. Higher-order N-soliton solutions with N=2, 3 are studied in detail and shown to be associated with self-focusing in the wave group dynamics and the generation of a steep localized carrier wave underneath the group envelope. We also show that for larger input soliton numbers, the wave group experiences irreversible spectral broadening, which we refer to as a hydrodynamic supercontinuum by analogy with optics. This process is shown to be associated with the fission of the initial multisoliton into individual fundamental solitons due to higher-order nonlinear perturbations to the NLS. Numerical simulations using an extended NLS model described by the modified nonlinear Schrödinger equation, show excellent agreement with experiment and highlight the universal role that higher-order nonlinear perturbations to the NLS play in supercontinuum generation. © 2013 American Physical Society. VolkswagenStiftung Alexander von Humboldt-Stiftung

Published
2013
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3. Recent progress in investigating optical rogue waves

Author

Akhmediev, Nail, Dudley, John Michaël, Solli, Daniel R, Turitsyn, Sergei K, Optical Sciences Group (OSG), Research School of Physics and Engineering [Canberra} (RSPE), Australian National University (ANU)-Australian National University (ANU), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Department of Electrical Engineering [Riverside], University of California [Riverside] (UCR), University of California-University of California, Aston Institute of Photonic Technologies (AIPT), and Aston University [Birmingham]

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]
Abstract

International audience; The science of rogue waves in optics is now over five years old, and it hasemerged as an area of broad interest to researchers across the physicalsciences [1]. This area of study was initiated by the pioneering measurement ofSolli et al [2] when analysing supercontinuum generation in optical fibres. Theirmeasurements, using a novel dispersive Fourier transform technique to capturehigh-speed events in the time domain, observed extraordinarily high amplitudepeaks at certain wavelengths in the chaotic spectrum from the supercontinuum.By analogy with the extreme waves in the ocean [3], of wide interest after 1995,such high amplitude pulses were described as ‘optical rogue waves’.

Published
2013

4. Observation of Kuznetsov-Ma soliton dynamics in optical fibre

Author

Frédéric Dias, Christophe Finot, Benjamin Wetzel, Nail Akhmediev, Julien Fatome, Guy Millot, John M. Dudley, Goëry Genty, Bertrand Kibler, SLCO, Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Tampere University of Technology [Tampere] ( TUT ), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies ( FEMTO-ST ), Université de Technologie de Belfort-Montbeliard ( UTBM ) -Ecole Nationale Supérieure de Mécanique et des Microtechniques ( ENSMM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Franche-Comté ( UFC ), Institute of Advanced Studies, ANU, School of Mathematical Sciences [Dublin], University College Dublin [Dublin] ( UCD ), Centre de Mathématiques et de Leurs Applications ( CMLA ), École normale supérieure - Cachan ( ENS Cachan ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Optics Laboratory [Tampere}, Tampere University of Technology [Tampere] (TUT), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Optical Sciences Group (OSG), Research School of Physics and Engineering [Canberra} (RSPE), Australian National University (ANU)-Australian National University (ANU), and University College Dublin [Dublin] (UCD)

Subjects
Current (mathematics), Context (language use), Type (model theory), 01 natural sciences, Article, 010305 fluids & plasmas, Physical Phenomena, symbols.namesake, 0103 physical sciences, Computer Simulation, Rogue wave, 010306 general physics, Nonlinear Schrödinger equation, Nonlinear Sciences::Pattern Formation and Solitons, Optical Fibers, ComputingMilieux_MISCELLANEOUS, Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Multidisciplinary, [ PHYS.PHYS.PHYS-OPTICS ] Physics [physics]/Physics [physics]/Optics [physics.optics], Series (mathematics), Models, Theoretical, Nonlinear system, Classical mechanics, Nonlinear Sciences::Exactly Solvable and Integrable Systems, Nonlinear Dynamics, symbols, Soliton, Algorithms
Abstract

International audience; The nonlinear Schro¨dinger equation (NLSE) is a central model of nonlinear science, applying to hydrodynamics, plasma physics, molecular biology and optics. The NLSE admits only few elementary analytic solutions, but one in particular describing a localized soliton on a finite background is of intense current interest in the context of understanding the physics of extreme waves. However, although the first solution of this type was the Kuznetzov-Ma (KM) soliton derived in 1977, there have in fact been no quantitative experiments confirming its validity. We report here novel experiments in optical fibre that confirm the KM soliton theory, completing an important series of experiments that have now observed a complete family of soliton on background solutions to the NLSE. Our results also show that KM dynamics appear more universally than for the specific conditions originally considered, and can be interpreted as an analytic description of Fermi-Pasta-Ulam recurrence in NLSE propagation.

Published
2012
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5. Nonlinear effetcts in dye-doped polymer optical fibres for optical communication

Author

Regis Barille, Barry Luther-Davies, Marek Samoc, Anna Samoc, Jean-Michel Nunzi, MOLTECH-Anjou, Université d'Angers (UA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Optical Sciences Group (OSG), Research School of Physics and Engineering [Canberra} (RSPE), Australian National University (ANU)-Australian National University (ANU), and Univ Angers, Okina

Subjects
010302 applied physics, Optical fiber, Materials science, business.industry, Nonlinear optics, Second-harmonic generation, Physics::Optics, Waveguide (optics), Graded-index fiber, 01 natural sciences, law.invention, 010309 optics, Optics, law, 0103 physical sciences, [CHIM] Chemical Sciences, Optoelectronics, [CHIM]Chemical Sciences, Photonics, business, Plastic optical fiber, Hard-clad silica optical fiber, ComputingMilieux_MISCELLANEOUS
Abstract

We review experimental studies of nonlinear optics in large-core dye doped plastic optical fibres. In particular second-order nonlinearity in all-optical poled optical fiber is promising for application to electro-optic switching, second-harmonic generation, and frequency conversion.

Published
2012

6. Punctuated eustatic sea-level rise in the early mid-Holocene

Author

Christopher M. Wurster, Meryem Mojtahid, L. Keith Fifield, William E. N. Austin, Michael I. Bird, Christopher Sargeant, James Cook university (AUSTRALIA), James Cook University (JCU), Department of Geography and Geosciences [St. Andrews], University of St Andrews [Scotland], Optical Sciences Group (OSG), Research School of Physics and Engineering [Canberra} (RSPE), Australian National University (ANU)-Australian National University (ANU), Laboratoire de Planétologie et Géodynamique - Angers (LPG-ANGERS), Laboratoire de Planétologie et Géodynamique [UMR 6112] (LPG), Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), and Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010506 paleontology, geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, δ13C, Climate change, Geology, 01 natural sciences, Prehistory, Oceanography, 13. Climate action, Rapid rise, [SDU]Sciences of the Universe [physics], Biological dispersal, Ice sheet, Holocene, Sea level, 0105 earth and related environmental sciences
Abstract

International audience; Whether eustatic sea-level rise through the Holocene has been punctuated or continuous has remained controversial for almost two decades. Resolving this debate has implications for predicting future responses of remaining ice sheets to climate change and also for understanding the drivers of human settlement and dispersal patterns through prehistory. Here we present a sea-level curve for the past 8900 yr from Singapore, a tectonically stable location remote from ice-loading effects. We also present critical and unique sedimentation rate, organic δ13C, and foraminiferal δ13C proxy records of sea-level change derived from a shallow-marine sediment core from the same area over the same time interval. The sea-level curve, corroborated by the independent proxy records, suggests rapid rise at a rate of 1.8 m/100 yr until 8100 cal (calibrated) yr B.P., a near cessation in the rate of sea-level rise between 7800 and 7400 cal yr B.P., followed by a renewed rise of 4–5 m that was complete by 6500 cal yr B.P. We suggest that this period of relatively stable sea level during the early to mid-Holocene enabled modern deltas to advance, providing a highly productive environment for the establishment of coastal sedentary agriculture. Periods of rapid sea-level rise before and after may have catalyzed significant postglacial episodes of human dispersal in coastal regions.

Published
2010
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