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26 results on '"Department of Information Engineering [Modena]"'

1. Core modal spatial-structuring in inhibited-coupling hollow-core fibers

Author

Foued Amrani, Martin Cordier, Benoit Debord, Jonas H. Osório, Frederic Gerome, M. Maurel, Fetah Benabid, Fabio Giovanardi, Frederic Delahaye, Matthieu Chafer, Luca Vincetti, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), GLOphotonics S.A.S., Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia (UNIMORE), Laboratoire Traitement et Communication de l'Information (LTCI), Institut Mines-Télécom [Paris] (IMT)-Télécom Paris, and OSA

Subjects
Materials science, business.industry, Nonlinear optics, 02 engineering and technology, 021001 nanoscience & nanotechnology, Hypocycloid, Cladding (fiber optics), Polarization (waves), Cladding mode, hollow core fibers, 01 natural sciences, 010309 optics, Transverse plane, Optics, Modal, 0103 physical sciences, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS, Leakage (electronics)
Abstract

A profound knowledge of the cladding mode properties and their interaction with the core modes is decisive for successfully designing inhibited-coupling (IC) guiding hollow-core photonic-crystal fibers (HC-PCFs). In IC fibers, the core and cladding modes coupling is robustly minimized due to a strong mismatch between their transverse phases and a small overlap between their fields. In the latest years, great attention has been given to IC fibers, especially since the introduction of the hypocycloid core contour concept [3], which entailed a dramatic loss reduction and preceded the development of single-ring tubular-lattice (SR-TL) HC-PCFs [4]. The interest on SR-TL HC-PCFs is due to their noteworthy properties such as geometric simplicity and the absence of connecting nodes in the fiber cladding, which favors IC guidance. Efforts on SR-TL HC-PCFs development entailed the accomplishment of ultra-low loss and broad transmission bandwidth [5]. Here, we show that the alteration of the lattice-tubes azimuthal position in SR-TL HC-PCFs causes modifications in the mode loss hierarchy and can be used to select the propagation of specific higher order modes (HOMs). It can be done by conveniently enlarging the spacing between the cladding tubes and by providing additional leakage to the fundamental mode while keeping low impact in the confinement loss (CL) of specific HOMs. It allows obtaining uncommon intensity profiles and polarization properties at the fiber output allowing it to act as a mode shaper.

Published
2019

2. An optimization approach for balancing maintenance costs and electricity consumption in Cloud Data Centers

Author

Chiaraviglio, Luca, d’Andreagiovanni, Fabio, Lancellotti, Riccardo, Shojafar, Mohammad, Blefari Melazzi, Nicola, Claudia, Canali, Università degli Studi di Roma Tor Vergata [Roma], Centre National de la Recherche Scientifique (CNRS), Heuristique et Diagnostic des Systèmes Complexes [Compiègne] (Heudiasyc), Université de Technologie de Compiègne (UTC)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)

Subjects
[INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], [MATH.MATH-OC]Mathematics [math]/Optimization and Control [math.OC], [INFO.INFO-RO]Computer Science [cs]/Operations Research [cs.RO], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

3. Manisfestation optique d’un état lié dans un continuum au sein d’une fibre à coeur creux à couplage inhibé

Author

Amsanpally, Abhilash, Debord, Benoît, Vincetti, Luca, Gérôme, Frédéric, Benabid, Fetah, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)

Subjects
[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
2017

4. Experimental optimization of curvature and silica thickness core contour of inhibited-coupling Kagome fibers

Author

J.-M. Blondy, Muhammad Adnan, Frédéric Gérôme, Fetah Benabid, Luca Vincetti, A. Gorse, Martin Maurel, Benoit Debord, A. Amsanpally, Benoit Beaudou, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), GLOphotonics S.A.S., Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)

Subjects
optical fibers, Materials science, Optical fiber, 02 engineering and technology, hollow core fibers, laser beams, Curvature, 01 natural sciences, 7. Clean energy, law.invention, 010309 optics, Optics, law, Fiber laser, 0103 physical sciences, ComputingMilieux_MISCELLANEOUS, Coupling, business.industry, Attenuation, Bandwidth (signal processing), 021001 nanoscience & nanotechnology, Femtosecond, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, 0210 nano-technology, business, Photonic-crystal fiber
Abstract

The dramatic progress in power-scaling of ultra-short pulse (USP) lasers and their continuous expansion use in industrial applications call for flexible and robust beam delivery systems (BDS) over several meters. Recently, a new branch of hollow-core photonic crystal fiber (HC-PCF) based on inhibited coupling (IC) mechanism has been proposed and successfully applied to demonstrate the delivery of milliJoule 600 femtosecond pulses in a several meter long piece and in robustly single-mode fashion [1]. Despite this breakthrough, it is desirable to reduce further the attenuation and enlarge the operating bandwidth of such fiber to increase the capability of the BDS whilst keeping the same delivery performances. In this context, a carefully optimization of the geometrical parameters of the core contour (i.e., the curvature b [2] and the silica thickness t) is studied resulting in the fabrication of new state-of-the-art IC Kagome HC-PCF combining losses less than 10 dB/km for the first time and associated to an enlarged transmission bandwidth able to cover all the entire industrial spectral range.

Published
2017

5. Strong nonlinear optical effects in micro-confined atmospheric air

Author

Fetah Benabid, Luca Vincetti, Benoit Debord, Martin Maurel, Frédéric Gérôme, Anton Husakou, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia (UNIMORE), Max-Born-institut, and Max-Born-institut, Berlin

Subjects
Materials science, hollow core fibers, nonlinear optics, photonics crystal fiber, business.industry, Physics::Optics, Nonlinear optics, Optical power, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Supercontinuum, law.invention, 010309 optics, law, Nonlinear medium, 0103 physical sciences, Dispersion (optics), [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Optoelectronics, High harmonic generation, 0210 nano-technology, business, Photonic-crystal fiber
Abstract

International audience; Historically, nonlinear optical phenomena such as spectral broadening by harmonic generation have been associated with crystals owing to their strong nonlinear refractive indices, which are in the range of ∼10 −14 cm 2 ∕W. This association was also the result of the limited optical power available from early lasers and the limited interaction length that the laser-crystal interaction architecture could offer. Consequently, these limitations disqualified a large number of materials whose nonlinear coefficient is lower than n 2 ∼10 −16 cm 2 ∕W as suitable materials for nonlinear optics applications. For example, it is a common practice in most of optical laboratories to consider ambient or atmospheric air as a "nonlinear optically" inert medium due to its very low nonlinear coefficient (∼10.10 −19 cm 2 ∕W) and low density. Today, the wide spread of high-power ultra-short pulse lasers on one hand, and low transmission loss and high-power handling of Kagome hollow-core photonic crystal fiber on the other hand, provide the necessary ingredients to excite strong nonlinear optical effects in practically any gas media, regardless of how low its optical nonlinear response is. By using a single table-top 1 mJ ultra-short pulse laser and an air exposed inhibited-coupling guiding hollow-core photonic crystal fiber, we observed generation of supercontinuum and third harmonic generation when the laser pulse duration was set at 600 fs and Raman comb generation when the duration was 300 ps. The supercontinuum spectrum spans over ∼1000 THz and exhibits a typical spectral-density energy of 150 nJ/nm. The dispersion profile of inhibited-coupling hollow-core fiber imprints a distinctive sequence in the supercontinuum generation, which is triggered by the generation of a cascade of four-wave mixing lines and concluded by solitonic dynamics. The Raman comb spans over 300 THz and exhibits multiple sidebands originating from N 2 vibrational and ro-vibrational Raman transitions. With the growing use of hollow-core photonic crystal fiber in different fields, the results can be applied to mitigate air nonlinear response when it is not desired or to use ambient air as a convenient nonlinear medium.

Published
2019
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6. Fusion splice between tapered inhibited coupling hypocycloid-core Kagome fiber and SMF

Author

Benoit Beaudou, Frédéric Gérôme, Benoit Debord, X.M. Zheng, Fetah Benabid, Luca Vincetti, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia (UNIMORE), and GLOphotonics S.A.S.

Subjects
Materials science, business.industry, Transmission loss, Photonic Crystal Fibers, Hollow Core Fibers, Transmission Loss, Tapering, 02 engineering and technology, 01 natural sciences, Atomic and Molecular Physics, and Optics, 010309 optics, Core (optical fiber), 020210 optoelectronics & photonics, Optics, Transmission Loss, 0103 physical sciences, Fusion splicing, 0202 electrical engineering, electronic engineering, information engineering, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Insertion loss, Fiber, Photonics, business, Photonic Crystal Fibers, Hollow Core Fibers, ComputingMilieux_MISCELLANEOUS, Photonic-crystal fiber
Abstract

We report for the first time on tapering inhibited coupling (IC) hypocycloid-core shape Kagome hollow-core photonic crystal fibers whilst maintaining their delicate core-contour negative curvature with a down-ratio as large as 2.4. The transmission loss of down-tapered sections reaches a figure as low as 0.07 dB at 1550 nm. The tapered IC fibers are also spliced to standard SMF with a total insertion loss of 0.48 dB. These results show that all-fiber photonic microcells with the ultra-low loss hypocycloid core-contour Kagome fibers is now possible.

Published
2016

7. Inhibited coupling kagome fibers with ultra-large hollow-core size for high energy ultrafast laser applications

Author

A. Amsanpally, Frédéric Gérôme, M. Alharbi, J.-M. Blondy, Benoit Debord, Fetah Benabid, Luca Vincetti, PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)

Subjects
All-silica fiber, Optical fiber, Materials science, 02 engineering and technology, 01 natural sciences, law.invention, 010309 optics, 020210 optoelectronics & photonics, Zero-dispersion wavelength, Optics, law, Fiber laser, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, ComputingMilieux_MISCELLANEOUS, business.industry, Plastic-clad silica fiber, technology, industry, and agriculture, Laser, Optical fiber, hollow core photonic crystal fiber, hollow core photonic crystal fiber, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, business, Hard-clad silica optical fiber, Photonic-crystal fiber
Abstract

We report on enlarged hollow-core diameter inhibited coupling Kagome fibers with record loss of 100 dB/km and ppm power overlap with silica surround, suitable for high energy ultrafast laser handling.

Published
2015

8. Triple-cup hypocycloid-core inhibited coupling Kagome hollow-core photonic crystal fiber

Author

Frédéric Gérôme, Fetah Benabid, Luca Vincetti, M. Alharbi, Benoit Debord, Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia (UNIMORE), PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), and Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
All-silica fiber, Materials science, Loss measurement, Integrated circuits, 02 engineering and technology, Hypocycloid, 01 natural sciences, 010309 optics, Fabrication, 020210 optoelectronics & photonics, Optics, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Propagation losses, Composite material, Optimized production technology, Optical fiber theory, Hollow core photonic crystal fiber, ComputingMilieux_MISCELLANEOUS, Photonic crystal, business.industry, Plastic-clad silica fiber, Microstructured optical fiber, Optical Fiber, Hollow core photonic crystal fiber, Optical Fiber, Core (optical fiber), Photonic crystal fibers, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, business, Hard-clad silica optical fiber, Photonic-crystal fiber
Abstract

We report on design and fabrication of a new hypocycloid core-contour Kagome HC-PCF based on a triangular-like shaped core exhibiting smaller effective area and comparable confinement loss than previous hypocycloid core-contour Kagome fibers.

Published
2015

9. Ultra-large core size hypocycloid-shape Kagome fibers for high-energy laser beam handling

Author

Debord, Benoît, Amsanpally, Abhilash, Alharbi, Meshaal, Vincetti, Luca, Blondy, Jean-Marc, Gérôme, Frédéric, Benabid, Fetah A., PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)

Subjects
[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

10. Splicing tapered inhibited-coupling hypocycloid-core Kagome fiber to SMF fibers

Author

Fetah Benabid, Luca Vincetti, X.M. Zheng, Frédéric Gérôme, M. Alharbi, Benoit Debord, PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)

Subjects
Materials science, Optical fiber, Loss measurement, Polarization-maintaining optical fiber, Integrated circuits, 02 engineering and technology, Splicing, 01 natural sciences, Graded-index fiber, law.invention, 010309 optics, 020210 optoelectronics & photonics, Optics, Zero-dispersion wavelength, law, Optical fiber networks, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Propagation losses, Fiber, Composite material, Optimized production technology, ComputingMilieux_MISCELLANEOUS, Plastic-clad silica fiber, business.industry, Couplings, Optical fiber, hollow core photonic crystal fiber, hollow core photonic crystal fiber, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, business, Hard-clad silica optical fiber, Photonic-crystal fiber
Abstract

We report on tapered inhibited coupling Kagome-fiber with a down-ratio as large as 2.4 while maintaining the hypocycloid-core shape. The insertion-loss of SMF spliced to tapered Kagome-fiber was measured with minimum of 0.48dB at 1550nm.

Published
2015

11. Fiber-delivery and Compression of Milli-joule Femtosecond Pulses and Micromachining

Author

Debord, Benoît, Dontabactouny, Madhoussoudhana, Alharbi, Meshaal, Fourcade Dutin, Coralie, Hönninger, Clemens, Mottay, Eric, Mocaer, E., Vincetti, Luca, Gérôme, Frédéric, Benabid, Fetah A., PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Amplitude Systèmes, Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)

Subjects
[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

12. Inhibiting coupling hollow-core photonic crystal fiber

Author

Benabid, Fetah A., Gérôme, Frédéric, Vincetti, Luca, Debord, Benoît, Alharbi, Meshaal, Bradley, Tom, PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)

Subjects
[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

13. Multi-meter fiber-delivery and pulse self-compression of milli-Joule femtosecond laser and fiber-aided laser-micromachining

Author

Debord, Benoît, Alharbi, Meshaal, Vincetti, Luca, Fourcade Dutin, Coralie, Hönninger, Clemens, Mottay, Eric, Gérôme, Frédéric, Benabid, Fetah A., PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia (UNIMORE), and Amplitude Systèmes

Subjects
[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

14. Lamb-Dicke spectroscopy of atoms in a hollow-core photonic crystal fibre

Author

Shoichi Okaba, Thomas D. Bradley, Z. A. Maizelis, V. A. Yampol'skii, Franco Nori, Hidetoshi Katori, Fetah Benabid, Luca Vincetti, Tetsushi Takano, Department of Applied Physics, Graduate School of Engineering, The University of Tokyo, PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia (UNIMORE), Kharkov National University, RIKEN Center for Advanced Photonics [Wako] (RIKEN RAP), and RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN)

Subjects
Optical fiber, Photon, Atomic Physics (physics.atom-ph), General Physics and Astronomy, Physics::Optics, FOS: Physical sciences, Nanotechnology, Quantum metrology, 01 natural sciences, Molecular physics, Article, General Biochemistry, Genetics and Molecular Biology, Physics - Atomic Physics, law.invention, 010309 optics, law, 0103 physical sciences, Atom, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, 010306 general physics, Spectroscopy, ComputingMilieux_MISCELLANEOUS, Optical lattice clock, Physics, Condensed Matter::Quantum Gases, Optical lattice, Multidisciplinary, General Chemistry, Atomic clock, Photonic crystal fibers, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Coherence (physics), Photonic-crystal fiber
Abstract

Unlike photons, which are conveniently handled by mirrors and optical fibres without loss of coherence, atoms lose their coherence via atom-atom and atom-wall interactions. This decoherence of atoms deteriorates the performance of atomic clocks and magnetometers, and also hinders their miniaturisation. Here we report a novel platform for precision spectroscopy. Ultracold strontium atoms inside a kKagome-lattice hollow-core photonic crystal fibre (HC-PCF) are transversely confined by an optical lattice to prevent atoms from interacting with the fibre wall. By confining at most one atom in each lattice site, to avoid atom-atom interactions and Doppler effect, a 7.8-kHz-wide spectrum is observed for the $^1 S_0-{}^3P_1$ (m=0) transition. Atoms singly trapped in a magic lattice in hollow-core photonic crystal fibresHC-PCFs improve the optical depth while preserving atomic coherence time., Comment: 31 pages, 8 figures

Published
2014
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15. Hypocycloid-shaped hollow-core photonic crystal fiber Part I: Cups curvature effect on confinement loss

Author

Debord, Benoît, Alharbi, Meshaal, Bradley, Tom, Fourcade Dutin, Coralie, Wang, Yingying, Vincetti, Luca, Gérôme, Frédéric, Benabid, Fetah A., PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), University of Bath [Bath], Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)

Subjects
[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Physics::Optics
Abstract

International audience; We report on numerical and experimental studies showing the influence of arc curvature on the confinement loss in hypocycloid-core Kagome hollow-core photonic crystal fiber. The results prove that with such a design the optical performances are strongly driven by the contour negative curvature of the core-cladding interface. They show that the increase in arc curvature results in a strong decrease in both the confinement loss and the optical power overlap between the core mode and the silica core-surround, including a modal content approaching true single-mode guidance. Fibers with enhanced negative curvature were then fabricated with a record loss-level of 17 dB/km at 1064 nm.

Published
2013

16. Enhanced Inhibited Coupling in hypocycloid core Kagome HC-PCF and milli-Joule Energy Ultra-Short pulse guidance and compression

Author

Gérôme, Frédéric, Debord, Benoît, Dontabactouny, Madhoussoudhana, Benabid, Fetah A., Alharbi, Meshaal, Fourcade Dutin, Coralie, Vincetti, Luca, GLOphotonics S.A.S., PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)

Subjects
[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2013

17. Pulse delivery and solitonic compression in hollow kagome waveguides in regime of photoionization

Author

Husakou, Anton, Fourcade Dutin, Coralie, Debord, Benoît, Dontabactouny, Madhoussoudhana, Hönninger, Clemens, Mottay, Eric, Vincetti, Luca, Gérôme, Frédéric, Benabid, Fetah A., Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (MBI), Forschungsverbund Berlin e.V. (FVB) (FVB)-Leibniz Gemeinschaft, PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Amplitude Systèmes, Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)

Subjects
[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2013

18. Multi-meter fiber-delivery and compression of milli-Joule femtosecond laser and fiber-aided micromachining

Author

Eric Mottay, Coralie Fourcade-Dutin, Frédéric Gérôme, Benoit Debord, Clemens Hönninger, Fetah Benabid, Luca Vincetti, M. Alharbi, Madhoussoudhana Dontabactouny, PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Amplitude Systèmes, Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia (UNIMORE), and Optical Society of America

Subjects
Materials science, business.industry, Joule, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, law.invention, 010309 optics, Surface micromachining, Optics, law, Pulse compression, 0103 physical sciences, Femtosecond, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Fiber, 0210 nano-technology, business, Phase modulation, Photonic-crystal fiber
Abstract

International audience; 10 meter-long Kagome HC-PCF were used to deliver mJ Yb-laser pulses and 600 fs pulse-width in single-mode fashion. Self-compression to ~50fs, and intensity-level nearing petawatt/cm2 were achieved. Free focusing-optics laser-micromachining is demonstrated on different materials.

Published
2013
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19. Milli-Joule femtosecond laser-pulse delivery and compression in hypocycloid core Kagome HC-PCF

Author

Eric Mottay, Benoit Debord, Coralie Fourcade-Dutin, Fetah Benabid, Luca Vincetti, Clemens Hönninger, Frédéric Gérôme, Madhou Dontabactouny, PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Amplitude Systèmes, Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia (UNIMORE), and Optical Society of America

Subjects
Materials science, business.industry, Physics::Optics, Joule, 02 engineering and technology, 021001 nanoscience & nanotechnology, Hypocycloid, Laser, 01 natural sciences, Hollow core fibers, Pulse (physics), law.invention, 010309 optics, photonic crystal fibers (PCFs), Optics, law, Pulse compression, 0103 physical sciences, Femtosecond, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, 0210 nano-technology, business, Self-phase modulation, Photonic-crystal fiber
Abstract

International audience; Milli-Joule energy and 600-femtosecond Yb-laser pulses were delivered in several meter Kagome hollow-core-photonic-crystal-fibers in robustly single-mode fashion. Self-compression to 50fs, and intensity-level of petawatt/cm2 were achieved. Free focusing-optics laser-micromachining is demonstrated.

Published
2013
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20. Cladding effect on confinement and bend losses in hypocycloid-core Kagome HC-PCF

Author

Debashri Ghosh, Fetah Benabid, Luca Vincetti, Thomas D. Bradley, Frédéric Gérôme, M. Alharbi, Benoit Debord, Coralie Fourcade-Dutin, University of Bath [Bath], PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia (UNIMORE), and OSA

Subjects
All-silica fiber, Materials science, business.industry, Plastic-clad silica fiber, 02 engineering and technology, Hypocycloid, Cladding (fiber optics), 01 natural sciences, Hollow core fibers, 010309 optics, photonic crystal fibers (PCFs), 020210 optoelectronics & photonics, Zero-dispersion wavelength, Double-clad fiber, Optics, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Composite material, business, Hard-clad silica optical fiber, Photonic-crystal fiber
Abstract

International audience; We report on numerical and experimental results on the influence of cladding ring number in hypocycloid-core Kagome HC-PCF. The number of rings has moderate effect on confinement loss whereas strong reduction in bend loss is demonstrated.

Published
2013
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21. Finding Long and Multiple Repeats with Edit Distance

Author

Federico, M., Peterlongo, P., NADIA PISANTI, Sagot, M. -F, Peterlongo, Pierre, Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia = University of Modena and Reggio Emilia (UNIMORE), Biological systems and models, bioinformatics and sequences (SYMBIOSE), Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Inria Rennes – Bretagne Atlantique, Institut National de Recherche en Informatique et en Automatique (Inria), Department of Computer Science [Pisa], University of Pisa - Università di Pisa, An algorithmic view on genomes, cells, and environments (BAMBOO), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de Biométrie et Biologie Evolutive - UMR 5558 (LBBE), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Modena e Reggio Emilia (UNIMORE), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), and Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Inria Rennes – Bretagne Atlantique

Subjects
[SDV.BIBS] Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], [INFO.INFO-DS]Computer Science [cs]/Data Structures and Algorithms [cs.DS], [INFO.INFO-DS] Computer Science [cs]/Data Structures and Algorithms [cs.DS], [INFO.INFO-BI]Computer Science [cs]/Bioinformatics [q-bio.QM], [SDV.BIBS]Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], [INFO.INFO-BI] Computer Science [cs]/Bioinformatics [q-bio.QM]
Abstract

International audience; We present a tool for detecting long similar fragments that occur two or more times in a set of biological sequences. The problem has interesting applications in the analysis of biological sequences and their correlation, and becomes computationally challenging when a certain non negligible number of insertions, deletions and substitutions are allowed. For this reason exact exhaustive methods are hardly of practical use. In this paper we introduce a tool, FilmRed, that performs this task, and that manages instances whose size and parameters combination cannot be handled by any existing tool. This is achieved by using a filter as a preprocessing step, and by using the information that the filter has gathered also in the successive inference phase. To the best of our knowledge, FilmRed is the first ab initio tool that can deal with repeats occurring possibly several times, that have length of hundreds or thousands bases, and whose occurrences may differ in even more than 10% of their positions in terms of substitutions and indels.

Published
2011

22. An optimized filter for finding multiple repeats in DNA sequences

Author

Pierre Peterlongo, Maria Federico, Nadia Pisanti, Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia = University of Modena and Reggio Emilia (UNIMORE), Biological systems and models, bioinformatics and sequences (SYMBIOSE), Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Inria Rennes – Bretagne Atlantique, Institut National de Recherche en Informatique et en Automatique (Inria), Department of Computer Science [Pisa], University of Pisa - Università di Pisa, Peterlongo, Pierre, Università degli Studi di Modena e Reggio Emilia (UNIMORE), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), and Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Inria Rennes – Bretagne Atlantique

Subjects
0303 health sciences, Multiple sequence alignment, Theoretical computer science, [SDV.BIBS] Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], Computational complexity theory, Computer science, Hamming distance, 0102 computer and information sciences, Filter (signal processing), 01 natural sciences, [SDV.BIBS]Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], Electronic mail, 03 medical and health sciences, 010201 computation theory & mathematics, Algorithm design, Edit distance, [INFO.INFO-BI]Computer Science [cs]/Bioinformatics [q-bio.QM], Heuristics, Algorithm, ComputingMilieux_MISCELLANEOUS, 030304 developmental biology, [INFO.INFO-BI] Computer Science [cs]/Bioinformatics [q-bio.QM]
Abstract

This paper presents new optimizations designed to improve an algorithm at the state-of-the-art for filtering sequences as a preprocessing step to the task of finding multiple repeats allowing a given pairwise edit distance between pairs of occurrences. The target application is to find possibly long repeats having two or more occurrences, such that each couple of occurrences may show substitutions, insertions or deletions in up to 10 to 15 % of their size. Assimilated to multiple alignment, exact detection of multiple repeats is an NP-hard problem. For increasing computation speed while avoiding the use of heuristics, one may use filters that quickly remove large parts of input that do not contain searched repeats. We describe at theoretical level some optimizations that can be applied to the tool that is currently the state-of-the-art for this filtering task. Finally, we exhibit some experiments in which the optimized tool outperforms its original version.

Published
2010

23. 7.7 dB/km transmission loss at 750 nm inhibited-coupling guiding hollowcore photonic crystal fibers

Author

Debord, B., Amsanpally, A., Chafer, M., Baz, A., Maurel, M., Blondy, J.M., Hugonnot, E., Scol, F., Vincetti, L., Gerome, F., Benabid, F., Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), GLOphotonics S.A.S., Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA-CESTA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia (UNIMORE), and Università degli Studi di Modena e Reggio Emilia = University of Modena and Reggio Emilia (UNIMORE)

Subjects
Fabrication, Materials science, business.industry, Band gap, Transmission loss, 02 engineering and technology, 021001 nanoscience & nanotechnology, Hypocycloid, Cladding mode, 01 natural sciences, 010309 optics, Transverse plane, Optics, Mechanics of Materials, 0103 physical sciences, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Electronic, Electronic, Optical and Magnetic Materials, Optical and Magnetic Materials, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS, Photonic crystal, Photonic-crystal fiber
Abstract

Last years have seen the emergence of a new class of hollow-core photonic crystal fibers (HC-PCF) no longer relying on photonic bandgap guidance but on inhibited-coupling (IC) mechanism. The first specie of this fiber family took the form of Kagome-lattice [1]. The guiding rule for enhancement of such a guidance (minimizing the coupling between the core mode and cladding mode, i.e (φ clad |Δn 2 | φ core ) → 0) led to the introduction in 2010 of hypocycloidal (or negative curvature) core contour [2] in Kagome HC-PCFs where record loss values (8.5 dB/km at 1 μm [3]) have been demonstrated. Thanks to this design, three reasons explain the reduction of such a criterion: i) the HE 11 mode field spatial overlap with silica is reduced to the tangent sections of the inner cups of the hypocycloid contour, ii) the larger perimeter of the hypocycloid contour results in a higher azimuthal-like number in the silica core-surround modes and hence, stronger transverse phase-mismatch with the core mode. iii) the spatial overlap between the core-mode with connecting nodes supporting low azimuthal number modes is strongly reduced. Recently, another hollow-core fiber design has been proposed that fully fulfils the mentioned features for IC guidance, relying on a tubular lattice with a one ring of isolated (with no connecting nodes) thin glass tubes [4]. Here, we report on the fabrication and characterization of ultra-low loss single-ring tubular lattice HC-PCFs (SR HC-PCF) guiding m the UV-VIS-NIR with absolute record loss value for HC-PCF at 750 nm with 7.7 dB/km, supplanting bandgap fiber performances in this spectral range.

24. Mode transformation in an inhibited-coupling guiding asymmetric tubular hollow fiber

Author

Frederic Gerome, Frederic Delahaye, Matthieu Chafer, Benoit Debord, Martin Cordier, Fetah Benabid, Fabio Giovanardi, Luca Vincetti, Jonas H. Osório, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), GLOphotonics S.A.S., Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia (UNIMORE), Laboratoire Traitement et Communication de l'Information (LTCI), Institut Mines-Télécom [Paris] (IMT)-Télécom Paris, and Gerome, Frédéric

Subjects
Materials science, [SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic, Orthogonal polarization spectral imaging, Physics::Optics, Otical Fibers, 02 engineering and technology, 021001 nanoscience & nanotechnology, Polarization (waves), 01 natural sciences, Molecular physics, law.invention, 010309 optics, Superposition principle, Otical Fibers, Photonic Crystal Fibers, law, 0103 physical sciences, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Mode transformation, 0210 nano-technology, Photonic Crystal Fibers, ComputingMilieux_MISCELLANEOUS, Beam splitter, Laser beams, Photonic-crystal fiber
Abstract

We report on mode transformation in an asymmetric tubular hollow fiber. We theoretically and experimentally show that LP01 and LP11 modes superposition entails an output profile with unusual spatially-separated orthogonal polarization sites.

25. 7.7 dB/km losses in inhibited coupling hollow-core photonic crystal fibers

Author

Benoit Debord, Matthieu Chafer, Fetah Benabid, Luca Vincetti, Assaad Baz, A. Amsanpally, Frédéric Gérôme, J.-M. Blondy, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)

Subjects
Hollow core, Materials science, business.industry, 02 engineering and technology, Fiber design and fabrication, Photonic crystal fibers, Fiber characterization, 01 natural sciences, 3. Good health, 010309 optics, Coupling (electronics), symbols.namesake, 020210 optoelectronics & photonics, Optics, 0103 physical sciences, Bend loss, 0202 electrical engineering, electronic engineering, information engineering, symbols, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Optoelectronics, Rayleigh scattering, business, ComputingMilieux_MISCELLANEOUS, Photonic-crystal fiber
Abstract

Several UV-VIS-NIR guiding HC-PCFs are fabricated. One exhibits a loss of 7.7 dB/km at ∼750 nm and guides down to 220 nm. A second exhibits ultra-broad fundamental-band with losses < 20 dB/km over 600–1200 nm.

26. Fano resonance in inhibited coupling Kagome fiber

Author

M. Alharbi, Fetah Benabid, A. Amsanpally, Luca Vincetti, Benoit Debord, Ekaterina Ilinova, Frédéric Gérôme, PHOTONIQUE (XLIM-PHOTONIQUE), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)

Subjects
Optical fiber, hollow core phtonic crystal fiber, Optical fiber, Noise measurement, Physics::Optics, Polarization-maintaining optical fiber, Integrated circuits, Fano plane, 01 natural sciences, Graded-index fiber, Molecular physics, hollow core phtonic crystal fiber, Imaging, 010309 optics, Optics, Image resolution, 0103 physical sciences, Dispersion-shifted fiber, 010306 general physics, Plastic optical fiber, ComputingMilieux_MISCELLANEOUS, Physics, business.industry, Fano resonance, Microstructured optical fiber, Couplings, Laser beams, Optical fiber polarization, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, business, Photonic-crystal fiber
Abstract

We report on the first experimental observation of Fano resonances in inhibited-coupling guiding Kagome fiber. A high-spectral resolution fiber-transmission showed the typical Fano asymmetric feature and a high dynamic-range near-field imaging resolved the core-cladding coupling.

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