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  • 1.
    Ahlgren, Bengt
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Claesson, Åsa
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Honfi, Daniel
    RISE Research Institutes of Sweden. Ramböll, Sweden.
    Kardeby, Victor
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Karoumi, Raid
    KTH Royal Institute of Technology, Sweden.
    Leander, John
    KTH Royal Institute of Technology, Sweden.
    Digitaliseringens möjligheter och utmaningar inom förvaltning och underhållsplanering av broar: Förstudie2020Report (Other academic)
    Abstract [en]

    Rapporten behandlar digitalisering – att införa ny digital teknik – i förvaltningsverksamheten av broar. Omfattningen är en förstudie med syftet att identifiera behovet av framtida forskning för en långsiktig utveckling av broförvaltningen. En grundläggande ansats var att en digitalisering ska minska behovet av kostsamma underhållsåtgärder men bibehålla en hög säkerhet för våra broar. Projektets mål var att samla information om digitala informationsmodeller som skapas under investeringsskedet, utvärdera överlämningen av digitala modeller till förvaltningsskedet, och värdera den eventuella nyttan med digital informationsinsamling för tillståndsbedömning och underhållsplanering. En viktig del av detta var beskrivningen av dagens förvaltningssystem och hur det skulle kunna utvecklas. Studierna har bedrivits genom en enkätundersökning med respondenter från konsultfirmor aktiva inom broprojektering, intervjuer med tekniska experter och litteratursökningar. Resultatet visar att projekteringen av broar idag huvudsakligen görs genom byggnads-informationsmodellering (BIM). Inriktningen är mot byggskedet där samordning och kommunikation bedöms vara de största nyttorna. Överlämningen till förvaltningen består dock av relationsritningar i formen av enkla ritningsfiler. Trots att Trafikverkets strategi för BIM beskriver att en informationsmodell bör leva kvar under hela brons livslängd, finns det tveksamheter huruvida en modell från projekteringen är lämplig som förvaltningsmodell. Istället lyfts andra metoder fram för att skapa en modell av det byggda utförandet. Till exempel optiska metoder för skanning och fotogrammetri. Förvaltningssystemen bör utvecklas med funktioner för att lagra och tillgängliggöra stora mängder digital information från sensorer maskinella inspektioner. Syftet är att minska osäkerheterna i det byggda utförandet och graden av nedbrytning, för att slutligen skapa ett bättre underlag för beslut om åtgärder. Ett framtida scenario är en digital tvilling som speglar den verkliga konstruktionen och uppdateras kontinuerligt genom sensordata. Gällande hårdvara för mätningar behöver sensorer och system utvecklas med avseende på energiförbrukning, energiskördning och underhållsåtgärder, t.ex. genom kombinationer av utbytbara komponenter med kort livslängd och andra delar med lång livslängd. Fiberoptiska sensorer visar på lovande egenskaper men utveckling behövs för att göra dem mer kostnadseffektiva i relation till konventionella sensorer.

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  • 2.
    Bai, Xiaohong
    et al.
    Northwest University, China; Carleton University, Canada.
    Claesson, Åsa
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Laronche, Albane
    Carleton University, Canada.
    Liu, Fu
    Carleton University, Canada.
    Hu, Manli
    Northwest University, China.
    Albert, Jaques
    Carleton University, Canada.
    Sensing applications of fiber Bragg gratings in single mode fibers with as-drawn 25 μm diameter cladding2021In: Optics and Laser Technology, ISSN 0030-3992, E-ISSN 1879-2545, Vol. 144, article id 107451Article in journal (Refereed)
    Abstract [en]

    The sensing properties of fiber Bragg gratings (FBG) inscribed in single mode fiber with a 5 μm diameter core and 25 μm diameter cladding are studied experimentally for temperature, strain, bending, and surrounding refractive index. Compared to normal single mode fiber, the diameter of this fiber is 5 times smaller and it stretches 14.5 times more at the same applied load. Therefore, it is much more flexible and stretchable, while maintaining excellent optical quality at wavelengths near 1550 nm. In addition to a core mode back reflection resonance, strong FBGs inscribed in this fiber show a relatively small number of narrow bandwidth (0.7 nm) cladding mode resonances separated in wavelength by 2.5–6 nm. This relatively coarse spectral comb can then be used to sense many different kinds of perturbations involving core and cladding modes. In particular, unlike cladding-mode based sensors made from tilted FBGs, all resonances are of the same azimuthal order as the core mode (i.e. HE1m). This feature makes these gratings particularly sensitive to bending which causes the appearance of new resonances and reduced amplitudes of the original ones, each by up to 10 dB/mm−1 of curvature. On the other hand, the temperature sensitivities of all modes are similar to that of standard fiber (around 11 pm/oC) while strain sensitivities are somewhat higher (1.6–1.7 pm/μstrain). The surrounding refractive index sensitivity is also increased (by a factor of 3) over normal fiber, mostly due to the increased modal dispersion of the modes of the thinner cladding. Furthermore, it is possible to serially multiplex different gratings at different wavelengths by interleaving their resonance combs and preserving each grating identity in the combined spectrum.

  • 3.
    Claesson, Åsa
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Franciscangelis, Carolina
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Pereira, Joao
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Weldehawariat, Tedros
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Hey Tow, Kenny
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    FBG Applications in 25um Diameter Fibers2022In: Optics InfoBase Conference Papers, Optica Publishing Group (formerly OSA) , 2022Conference paper (Refereed)
    Abstract [en]

    Ultrathin 25μm optical fibers with FBG sensors are manufactured and used as vibration sensors in glass-fiber reinforced composites. The use of ultrathin fibers is discussed, and their manufacture is described. © 2022 The Authors.

  • 4.
    Claesson, Åsa
    et al.
    RISE, Swedish ICT, Acreo.
    Holm, J
    Koch, R
    Olson, M
    Olsson, A
    Vieider, C
    Ahlfeldt, H
    Laurell, F
    Diode-pumped miniature lasers using microstructured silicon carriers2000In: Electronic Letters, Vol. 36, no 5, p. 433-Article in journal (Refereed)
  • 5.
    Claesson, Åsa
    et al.
    RISE, Swedish ICT, Acreo.
    Holm, Johan
    Olson, Magnus
    Vieider, Christian
    Åhlfeldt, Henrik
    Bjurshagen, Stefan
    Bäcklin, Lennart
    Olsson, Anders
    Koch, Ralf
    Laurell, Fredrik
    Novel design for diode-pumped miniature lasers using microstructured silicon carriers2000In: Advanced Solid State Lasers, Optica Publishing Group , 2000Conference paper (Refereed)
    Abstract [en]

    A new design concept for compact diode-pumped solid-state lasers is presented. The design is based on a microstructured silicon carrier with etched v-grooves. This silicon microbench provides efficient thermal management at 10W pumping level, as well as compact integration and alignment of all active and passive optical components of compact diode-pumped solid-state lasers. In initial experiments, a Nd:YAG laser built on the microbench delivered a continuous-wave output of 3W.

  • 6.
    Claesson, Åsa
    et al.
    RISE, Swedish ICT, Acreo.
    Koch, R.
    Olson, M.
    Ohman, F.
    Wu, R.
    Myers, J. D.
    Myers, M. J.
    Novel Er:Yb phosphate glass fiber laser pumped by a 946 nm Nd:YAG laser2001In: Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH37170), 2001Conference paper (Refereed)
    Abstract [en]

    Summary form only given. Recently, Kigre introduced a new family of rare-earth doped fibers (Wu et al, 2000), based on phosphate laser glass. Due to their phonon energy, erbium-doped phosphate glasses exhibit lower up-conversion losses than silica glass. This, and the high solubility for rare-earth ions, makes phosphate glasses promising candidates for high-gain erbium devices. High doping concentrations enable short devices, and fiber lasers or amplifiers with only a few centimeters of active fiber can be realized. This is to be compared to standard EDFAs that normally contain tens of meters of erbium-doped silica fibers. We have demonstrated a short fiber-laser based on a single-mode Er:Yb codoped phosphate fiber, pumped by a 946 nm Nd:YAG laser.

  • 7.
    Claesson, Åsa
    et al.
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Lyckfeldt, Ola
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Lindqvist, Jonas
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Kardeby, Victor
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Lejon, Erik
    Gestamp HardTech AB, Sweden.
    Ulfberg, Petter
    Proximion AB, Sweden.
    Rendall, Helen
    Proximion AB, Sweden.
    Hedin, Gunnar
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Ottosson, Peter
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Ohlsson, David
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Kvarned, Anders
    Uddeholms AB, Sweden.
    Karamchedu, Seshendra
    Uddeholms AB, Sweden.
    Brinkfeldt, Klas
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Hosseini, Seyed
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    lntegrated Optical Fiber Sensors in Additive Manufactured Metal Components for Smart Manufacturing Applications2019In: Smart Systems Integration; 13th International Conference and Exhibition on Integration Issues of Miniaturized Systems, 2019Conference paper (Refereed)
    Abstract [en]

    This work combines fiber optic sensors with additive manufacturing to enable integration of temperature and strain sensors in metal components. In this paper, we present a fiber optic sensor network integrated in press hardening tools to monitor the contact between the tool and the metal sheet during forming operation. The tools are manufactured through metal powder bed fusion using laser melting processes (PBF-SLM), after which the tools are prepared for sensor integration. A demonstrator press hardening tool with integrated fiber optic sensors was heated using an electric heat foil and the sensor measurements was compared to a thermal simulation model. The sensor technology is based on Fiber Bragg Gratings (FBGs), integrated at several positions along the optical fiber. FBGs are in-fiber sensors that are multiplexed. lt is possible to place hundreds of FBG sensors along one single fiber, thus allowing for quasidistributed sensing of temperature or strain. The optical fiber itself can be less than 100 micrometer in diameter, allowing for sensing at several points in a minimally invasive way, when integrated in a tool or component.

  • 8.
    Claesson, Åsa
    et al.
    RISE, Swedish ICT, Acreo.
    Sahlgren, Bengt
    Fokine, Michael
    Stubbe, Raoul
    UV-transparent coatings for optical fiber1997Conference paper (Refereed)
    Abstract [en]

    Bragg gratings have been produced in germanosilicate optical fibers by exposing the fiber, through a polymer coating, to an interference pattern in the ultraviolet wavelength region. Two different coatings, Teflon AF@ 1600 and Kynar@ 7201, were applied on the fiber by dip coating and their optical properties in the 200-300 nm range were investigated. During the grating fabrication process, Teflon AF showed no sign of degradation at the fluencies required for efficient grating manufacturing. When Kynar 7201 was used, the coating darkened and decomposed

  • 9.
    Claesson, Åsa
    et al.
    RISE, Swedish ICT, Acreo.
    Smuk, S.
    Arsalane, H.
    Margulis, Walter
    Naterstad, T.
    Zimmer, E.
    Malthe-Sørenssen, A.
    Internal Electrode Fiber Polarization Controller2003In: Conf Opt Fiber Commun Tech Dig Ser, 2003, p. 39-40Conference paper (Refereed)
    Abstract [en]

    Potentially low-cost polarization controllers were studied with a current-driven internal electrode fibers. The return loss was determined for the device. An EDFA was used as light source, and five devices were constructed and tested. The polarization dependent loss (PDL) of the polarization controllers was measured between 1530 nm and 1570 nm using the Jones-matrix method. The response times for the controllers was found to be relatively slow. The rise time of the optical response was significantly improved by overshooting the current pulse.

  • 10. Dierolf, V.
    et al.
    Morgus, T.
    Fleischman, Z.
    Sandmann, Chr.
    Claesson, Åsa
    RISE, Swedish ICT, Acreo.
    Margulis, Walter
    RISE, Swedish ICT, Acreo.
    Characterization of highly erbium-doped fibers using confocal luminescence microscopy2004In: OSA Trends Opt. Photonics Series, Optical Society of American (OSA) , 2004, p. 539-541Conference paper (Refereed)
    Abstract [en]

    Using confocal luminescence microscopy and detailed evaluation of the luminescence spectra in terms of intensity, spectral position and width, we determined the erbium doping profiles and their inhomogeneities in high index profile singly mode fibers. 

  • 11.
    Fokine, M
    et al.
    RISE, Swedish ICT, Acreo.
    Nilsson, LE
    Claesson, Åsa
    RISE, Swedish ICT, Acreo.
    Berlemont, D
    Kjellberg, L
    Krummenacher, L
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Integrated fiber Mach Zehnder interferometer for electro-optic switching2002In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 27, no 18, p. 1643-45Article in journal (Refereed)
  • 12.
    Foote, P
    et al.
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Breidne, M
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Levin, K
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Papadopolous, P
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Read, I
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Signorazzi, M
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Nilsson, L-E
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Stubbe, R
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Claesson, Åsa
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Operational load monitoring using optical fibre sensors2004In: Health monitoring of aerospace structures: Smart sensor technologies and signal processing / [ed] Staszewski, W., Boller, C., and Tomlinson, G., West Sussex, England: John Wiley & Sons, 2004Chapter in book (Other academic)
  • 13.
    Hellsing, M.
    et al.
    Materiex AB, Sweden.
    Fokine, M.
    RISE, Swedish ICT, Acreo.
    Claesson, Åsa
    RISE, Swedish ICT, Acreo.
    Nilsson, L. -E
    RISE, Swedish ICT, Acreo.
    Margulis, Walter
    RISE, Swedish ICT, Acreo.
    ToF-SIMS imaging of dopant diffusion in optical fibers2003In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 203-204, p. 648-651Article in journal (Refereed)
    Abstract [en]

    Applications of optical fibers in telecommunication and sensing are rapidly emerging where the fiber properties are related to the controlled addition of dopants such as germanium, phosphorous, fluorine and erbium. The modern ToF-SIMS instrument, with its high sensitivity and high lateral resolution, has shown to be an excellent tool to directly analyze cross-sections of as-manufactured fibers. The present work describes ToF-SIMS imaging of the dopant distribution in fluorine, germanium and rare-earth doped fibers where dopants are confined to a few μm in the core. The increased fluorine diffusion in the fluorine doped fibers due to chemical reactions with hydroxyl groups was examined. This process is utilized in the manufacture of thermally stable chemical composition fiber Bragg gratings. We were able to produce ToF-SIMS elemental images with a lateral resolution around 0.5μm showing the detailed distribution of the dopants.

  • 14. Hellsing, Maja
    et al.
    Fokine, M
    Claesson, Åsa
    RISE, Swedish ICT, Acreo.
    Nilsson, L-E
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Time-of-flight secondary ion mass spectrometry imaging of dopant diffusion in optical fiber2003In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 203-204, p. 3458-61Article in journal (Refereed)
  • 15.
    Jelger, P.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Laurell, F.
    KTH Royal Institute of Technology, Sweden.
    Pasiskevicius, V.
    KTH Royal Institute of Technology, Sweden.
    Enström, A.
    RISE, Swedish ICT, Acreo.
    Claesson, Åsa
    RISE, Swedish ICT, Acreo.
    Margulis, Walter
    RISE, Swedish ICT, Acreo.
    An in-fibre microcavity2007In: Opt.InfoBase Conf. Papers, Optical Society of America , 2007Conference paper (Refereed)
    Abstract [en]

    A novel all-fiber spliced microcavity for chemical and biological optical studies is described. Its design allows coupling with low loss light from a fiber into a liquid or gas contained in a capillary or PCF. 

  • 16.
    Leyssner, Felix
    et al.
    Engionic Femto Gratings GMBH, Germany.
    Myumyun, Erray
    Somni Corporation BV, Netherlands.
    Meijer, Eric
    Somni Corporation BV, Netherlands.
    Knoppers, Rik
    Somni Corporation BV, Netherlands.
    Daugherty, Tim
    Millar, Inc, USA.
    Stoker, Anne
    Millar, Inc, USA.
    Claesson, Åsa
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Nieuwland, Remco
    Somni Corporation BV, Netherlands.
    fs-IR laser point-by-point inscription of Fiber Bragg Gratings for a new generation of miniature sensors using novel 25μm diameter optical fibers2022In: Optics InfoBase Conference Papers, Optica Publishing Group (formerly OSA) , 2022Conference paper (Refereed)
    Abstract [en]

    fs-point-by-point through the coating written FBGs as a basis for novel sensor concepts using 25μm optical fiber. fs-point-by-point FBGs in novel single mode fiber with a cladding diameter of 25μm have been produced in fiber that is 5 times smaller than conventional telecommunication optical fiber. The development opens the path to new sensor types including miniature pressure sensors with a diameter of only 330μm (1Fr.). © 2022 The Author(s).

  • 17.
    Lindblom, Magnus
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware. Unit, Sweden.
    Patzauer, Maximilian
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware. Unit, Sweden.
    Hey Tow, Kenny
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware. Unit, Sweden.
    Claesson, Åsa
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware. Unit, Sweden.
    Fogelberg, Oscar
    Agellis Group RHI Magnesita, Sweden.
    Jonsäter, Toste
    Höganäs AB, Sweden.
    Warne, Mattias
    Höganäs AB, Sweden.
    Refractory Lining Health Monitoring Based on Raman Optical Time Domain Reflectometry2023In: Proceedings of SPIE - The International Society for Optical Engineering, SPIE , 2023, Vol. 12643, article id 1264327Conference paper (Refereed)
    Abstract [en]

    A fiber optic health-monitoring system for refractory lining in steel-making processes is presented. Its applicability as an early-warning system for lining damage is demonstrated by the results obtained in a field trial, in which 240 m of fiber was embedded in the lining of an electric arc furnace. The system is based on Raman distributed sensing and polyimide coated fibers in metal tube. The results presented from temperature cycling and calibration at temperatures up to 600 °C show that adequate accuracy and stability for the application can be attained.

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  • 18.
    Lindblom, Magnus
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Patzauer, Maximilian
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Vogt, Ulrich
    KTH Royal Institute of Technology, Sweden.
    Wilbur, Scott
    University of Sheffield, UK.
    Safari Yazd, Nazila
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Hey Tow, Kenny
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Margulis, Walter
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Claesson, Åsa
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Ebenhag, Sven-Christian
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Flexible Liquid-Filled Scintillating Fibers for X-Ray Detection2023In: 2023 IEEE SENSORS, Institute of Electrical and Electronics Engineers (IEEE), 2023Conference paper (Refereed)
    Abstract [en]

    We present the design and fabrication of flexible, liquid-filled scintillating fibers for X-ray detection made from silica fibers and silica capillaries. The scintillating fibers were characterized using ultraviolet light exposure and we also performed an experiment demonstrating X-ray detection.

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  • 19. Myren, N
    et al.
    Fokine, M
    Claesson, Åsa
    RISE, Swedish ICT, Acreo.
    Tarasenko, O
    RISE, Swedish ICT, Acreo.
    Nilsson, L-E
    Kjellberg, L
    Olsson, H
    RISE, Swedish ICT, Acreo.
    Norin, L
    RISE, Swedish ICT, Acreo.
    Helander, P
    RISE, Swedish ICT, Acreo.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Fibre components with internal electrodes2004In: DOPS NYT, Vol. 18, no 4, p. 20-23Article in journal (Refereed)
  • 20. Méndez, Alexis
    et al.
    Wnuk, Vincent P.
    Fokine, Michael
    Claesson, Åsa
    RISE, Swedish ICT, Acreo.
    Nilsson, Lars-Erik
    Ferguson, Steve
    Graver, Tom
    Packaging process of fiber Bragg grating strain sensors for use in high-temperature applications2005Conference paper (Refereed)
    Abstract [en]

    In this paper, we report the development of a new bonding agent and method for the surface mounting of optical fiber Bragg grating (FBG) strain and temperature sensors for use in high temperature environments--where there is a presence of water, moisture, dust, susceptibility to corrosion and/or elevated temperatures up to 800°C. To ensure a stable reflectivity response of FBGs and their survival at elevated temperatures, we are using chemical composition gratings (CCGs). The refractive index modulation in these gratings is caused by a chemical change, which results in a higher activation energy and stable behavior up to 1000°C. Samples of CCGs were successfully encapsulated and mounted onto metal shims. The packaged sensors were tested for strain (+/- 1000με) and temperature (to +400 °C) response. The encapsulated sensors display a linear response with an increase in the temperature sensitivity of the FBG, with a factor of ~ 28.34pm/°C, and a strain gauge factor of 1.7pm/με.

  • 21.
    Nilsson, Lars-Erik
    et al.
    RISE, Swedish ICT, Acreo.
    Claesson, Åsa
    RISE, Swedish ICT, Acreo. Uppsala University, Sweden.
    Margulis, Walter
    KTH Royal Institute of Technology, Sweden.
    Fonjallaz, Pierre-Yves
    Swiss Federal Institute of Technology, USA; Kista Photonics Research Centre, Sweden; KTH Royal Institute of Technology, Sweden.
    Specialty Single-Mode Fibers2007In: Specialty Optical Fibers Handbook, Elsevier Inc. , 2007, p. 165-193Chapter in book (Other academic)
    Abstract [en]

    This chapter provides an overview of unusual multifunctional, specialty single-mode fibers-macrohole fibers, multicore fibers, fibers with internal electrodes, and fibers for high-temperature resistant fiber Bragg gratings. Macrohole fibers belong to the group of microstructured fibers, which encompass a wide variety of fibers with air holes or other structures extending in the axial direction. Functions performed using macrostructured fibers include supercontinuum generation in tapered hole fibers, dispersion management, fibers with decreased bend loss for compact optical fiber wiring, and fibers for polarimetric sensing, and lasers. The introduction of materials in the holes adds the possibility of manipulating the guiding properties of the fiber. This can be achieved by interaction of the guided mode with actively controllable materials in the holes or by using the inserted materials for other active functions, such as a metal electrode to implement electro-optic control of the fiber. The proposed applications for multicore fibers span over lasers and amplifiers, transport fibers for broadband communications, passive, and active fiber optic components such as filters, multiplexers, and various kinds of sensors. The ultimate multicore fiber is the image fiber used in endoscopes and other such devices.

  • 22.
    Pereira, Joao
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware. KTH Royal Institute of Technology, Sweden.
    Claesson, Åsa
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Laurell, F.
    KTH Royal Institute of Technology, Sweden.
    Tarasenko, Oleksander
    RISE Research Institutes of Sweden.
    Margulis, Walter
    RISE Research Institutes of Sweden. KTH Royal Institute of Technology, Sweden.
    Poling optical fibers with electrical corona discharge2021In: Optics InfoBase Conference Papers, The Optical Society , 2021Conference paper (Refereed)
  • 23.
    Pereira, Joao
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware. KTH Royal Institute of Technology, Sweden.
    Tarasenko, Oleksander
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Claesson, Åsa
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Laurell, Fredrik
    KTH Royal Institute of Technology, Sweden.
    Margulis, Walter
    KTH Royal Institute of Technology, Sweden; Fiberactivity Ltda, Brazil.
    Optical poling by means of electrical corona discharge2022In: Optics Express, E-ISSN 1094-4087, Vol. 30, no 12, p. 20605-20613Article in journal (Refereed)
    Abstract [en]

    Electrical corona discharge is employed in this work to deposit ions on the surface of an optical fiber, creating a strong electric field that is used for poling. Green laser light propagating in the core frees photocarriers that are displaced by the poling field. The technique presented can induce a higher optical nonlinearity than previously obtained in traditional optical poling with internal metal electrodes. To date, a maximum second order nonlinearity 0.13 pm/V has been achieved for a 15 kV corona discharge bias. 

  • 24. Pitois, Clare
    et al.
    Hult, Anders
    Wiesmann, Dorothea
    Claesson, Åsa
    RISE, Swedish ICT, Acreo.
    Lindgren, Mikael
    Functionalized polymers for photonic applications2000Conference paper (Refereed)
  • 25. Rehman, S
    et al.
    Claesson, Åsa
    RISE, Swedish ICT, Acreo.
    A new world of fiber sensors2009In: Photonics, no OctArticle in journal (Other academic)
  • 26. Rehman, S
    et al.
    Claesson, Åsa
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Specialty optical fibers make surgery less invasive2011In: BioPhotonicsArticle in journal (Other academic)
  • 27. Torres, Pedro Ignacio
    et al.
    Arsalane, H.
    Carlsson, Fredrik
    Claesson, Åsa
    RISE, Swedish ICT, Acreo.
    Margulis, Walter
    RISE, Swedish ICT, Acreo.
    Electrically controlled Bragg grating in microstructured fiber with internal electrode2004Conference paper (Refereed)
    Abstract [en]

    Microstructured fibers with internal electrode provide a new, flexible means for shaping the spectral properties of intracore gratings. In particular, control of the current that is applied to electrode permits modifies the central wavelength and the birefringence of the grating. The fabrication procedures for this type of device and experimental results related to its operation are described.

1 - 27 of 27
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