A5061889538- Optical Network Technologies
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Photonic Crystal and Fiber Optics
- Advanced Photonic Communication Systems
- Plasmonic and Surface Plasmon Research
- Nonlinear Photonic Systems
- Neural Networks and Reservoir Computing
- Photonic Crystals and Applications
- Advanced Fiber Optic Sensors
- Nonlinear Dynamics and Pattern Formation
- Chaos control and synchronization
- Gold and Silver Nanoparticles Synthesis and Applications
- Optical Coatings and Gratings
- Semiconductor Lasers and Optical Devices
- Nonlinear Waves and Solitons
- Laser-Matter Interactions and Applications
- Mechanical and Optical Resonators
- Near-Field Optical Microscopy
- Metamaterials and Metasurfaces Applications
- Orbital Angular Momentum in Optics
- Optical Coherence Tomography Applications
- Chaos-based Image/Signal Encryption
- Fern and Epiphyte Biology
- Semiconductor Quantum Structures and Devices
University of Southampton
2017-2025
Université Bourgogne Franche-Comté
2015-2018
Laboratoire Interdisciplinaire Carnot de Bourgogne
2013-2018
Université de Bourgogne
2013-2017
Centre National de la Recherche Scientifique
2013-2017
Australian National University
2016-2017
Jeonbuk National University
2015
University of Brescia
2008-2013
National Interuniversity Consortium for the Physical Sciences of Matter
2010-2011
We observe the breakup dynamics of an elongated cloud condensed $^{85}\mathrm{Rb}$ atoms placed in optical waveguide. The number localized spatial components observed is compared with solitons predicted by a plane-wave stability analysis nonpolynomial nonlinear Schr\"odinger equation, effective one-dimensional approximation Gross-Pitaevskii equation for cigar-shaped condensates. It shown that numbers from fastest growing sidebands are consistent experimental data, suggesting modulational...
Abstract Multimode devices and components have attracted considerable attention in the last years, different research topics themes emerged very recently. The multimodality can be seen as an additional degree of freedom designing devices, thus allowing for development more complex sophisticated components. propagation modes used to increase fiber optic capacity, but also introduce novel intermodal interactions, well manipulation optical a variety applications. In this roadmap we would like...
Abstract Compact power splitters are essential components in integrated optics. While 1 × 2 with uniform splitting widely used, a N splitter arbitrary number of ports and ratio is yet to be demonstrated. In this work we address problem. We fabricate characterise that provide fully ratios. The core our design represented by an array non-equally spaced waveguides fabricated on silicon nitride-on-insulator wafer. Any can achieved properly setting the length dimension ( –1) nano-gaps between...
In this paper intermodal modulational instability (IM-MI) is analyzed in a multimode fiber where several spatial and polarization modes propagate. The coupled nonlinear Schr\"{o}dinger equations describing the modal evolution are linearized reduced to an eigenvalue problem. As result, amplification of each mode can be described by means eigenvalues eigenvectors matrix that stores information about dispersion properties power distribution pump. Some useful analytical formulas also provided...
Abstract Recent research has been focused on the ability to manipulate a light beam in such way hide, namely cloak, an event over finite time or localization space. The main idea is create hole gap spatial domain so as allow for object data be kept hidden while and then restored. By enlarging field of applications this concept telecommunications, researchers have recently reported possibility hide transmitted optical fibre. Here we report first experimental demonstration perpetual temporal...
Recurrence behaviors are well known in wave systems that initially exhibit phase coherence. A new theory shows similar recurrences can occur among disordered waves as well, thus leading to a reduction of entropy is contrary everyday experience.
Abstract Novel fundamental notions helping in the interpretation of complex dynamics nonlinear systems are essential to our understanding and ability exploit them. In this work we predict demonstrate experimentally a property Kerr-nonlinear media, which name mode rejection takes place when two intense counter-propagating beams interact multimode waveguide. stark contrast attraction phenomena, leads selective suppression spatial forward beam, is controlled via backward beam. Starting from...
We study the propagation characteristics of optical signals in waveguides composed linear periodic arrangements metallic nanoparticles embedded a dielectric host. find complex Bloch band diagram for guided modes including material losses by employing Mie scattering theory as well coupled dipole approximations. The results model are validated through finite element solution Maxwell's equations.
We theoretically and numerically investigate intermodal four-wave mixing in kilometer-long fibers, where random birefringence fluctuations are present along the fiber length. identify several distinct regimes that depend on relative magnitude between length scale of beat lengths interacting quasi-degenerate modes. In addition, we analyze impact mode dispersion demonstrate variations core radius, which typically encountered during drawing stage fiber, can represent major source bandwidth...
We study light propagation in nanoscale periodic structures composed of dielectric and metal the visible range. demonstrate that diffraction can be tailored both magnitude sign by varying geometric features waveguides. Diffraction management on a subwavelength scale is demonstrated numerical solution Maxwell equations frequency domain.
We report the experimental observation of bistability and hysteresis phenomena polarization signal in a telecommunication optical fiber. This process occurs counterpropagating configuration which beam nonlinearly interacts with its own Bragg-reflected replica at fiber output. The proof principle flip–flop memory 10 Gbit/s routing operation is also reported based on this bistability. Finally, we provide general physical understanding behavior basis geometrical analysis an effective model...
We develop from first principles the coupled wave equations that describe polarization-sensitive parametric amplification based on four-wave mixing in standard (randomly birefringent) optical fibers. show small-signal case these can be solved analytically, and permit us to predict gain experienced by signal beam as well its state of polarization (SOP) at fiber output. find that, independently initial value, output SOP a within bandwidth is solely determined pump SOP. call this effect pulling...
We report theoretical and experimental results on a wavelength converter based intermodal phase matching in graded index three-mode elliptical-core fiber. Here, two copolarized pump waves propagate one spatial mode, whereas signal the corresponding generated idler another mode. demonstrate that power is independent of polarization both 1 km 50 m long attribute this insensitivity to fast random birefringence fiber under investigation combination with configuration.
We demonstrate an 80 nm bandwidth (extending from 1529 to 1609 nm), dual-stage, diode-pumped, lumped Raman amplifier using a relatively short total length (2 km) of highly nonlinear fiber. The impact Rayleigh back scattering is mitigated and the build-up thermally generated wavelength dependent noise controlled by suitably adjusting spectral gain profile in two stages. In this way high overall 27 dB with 2.6 flatness average figure 5.8 <; 1 variation achieved across full bandwidth.
We investigate the phenomenon of polarization attraction in a highly birefringent fiber. This process originates from nonlinear interaction two counter-propagating beams. show that all states forward (signal) beam are attracted toward specific line on surface Poincaré sphere, whose characteristics determined by state injected backward (pump) beam. takes place without any loss energy for signal The stability different stationary solutions is also discussed through intensive numerical...
Abstract We introduce a 1 × N integrated power splitter for the multimode photonics platform. The device converts an input laser beam into higher-order mode beam, which afterwards is split. core of this setup represented by non-uniform array waveguides that allows achieving arbitrary splitting. system exhibits high modal purity and tested against wavelength variations fabrication errors. possibility to include multi-input port configuration, leading various ratios via single device, provides...
We experimentally demonstrate a means to selectively enhance wavelength conversion of WDM channels on 100 GHz grid exploiting nonlinear effects between the spatial modes few mode fiber. The selectivity parametric gain is obtained by dispersion design fiber such that inverse group velocity curves participating are parallel and their suitably large. describe both theoretically observed dependence idler profile pump (quasi) degeneracy.
We introduce a novel all-optical platform in multimode and multicore fibres. By using low-power probe beam high-power counter-propagating control beam, we achieve advanced dynamic over light propagation within the This setup enables reconfiguration of probe, which is achieved by solely tuning power. Key operations such as fully tuneable power splitting mode conversion, core-to-core switching combination, along with remote characterization, are demonstrated at sub-nanosecond time scale. Our...
We develop a novel theoretical model for the study of harmonic generation in cylindrical structures finite height. Our technique is based on decomposition electromagnetic field over complete set modes corresponding infinite cylinder. Differently from previous works, our no constraints are given neither cross section nor refractive index then apply approach special case frequency doubling tall AlGaAs nanodisks, where radiative can be neglected. results open new perspectives optimization and...
We report a simple and efficient all-optical polarization scrambler based on the nonlinear interaction in an optical fiber between signal beam its backward replica which is generated amplified by reflective loop. When amplification factor exceeds certain threshold, system exhibits chaotic regime evolution of output state becomes temporally scrambled all over surface Poincaré sphere. numerically derive some design rules for scrambling performances our device are well confirmed experimental...
Parametric amplification or four-wave mixing in high-birefringence optical fibers may be exploited to implement a novel type of nonlinear polarizer. Such device leads the simultaneous amplification, frequency conversion, and repolarization both signal idler waves along one principal birefringence axes fiber, independently pump, signal, input state polarization, power, detuning. We discuss conditions for observation polarization attraction fiber optics parametric amplifiers operating with...