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Ole Bang - One of the best experts on this subject based on the ideXlab platform.

  • Fast Inscription of Long Period Gratings in Microstructured Polymer Optical Fibers
    IEEE Sensors Journal, 2018
    Co-Authors: Carlos Marques, K. Nielsen, Ole Bang, Beatriz Ortega
    Abstract:

    We demonstrate 20 dB long period grating (LPG) fast inscription in Microstructured Polymer optical fibers (mPOFs) using a point-by-point technique obtaining an LPG total length of 25 mm. Two 248 nm UV laser pulses of 15 ns duration have been employed for every inscription point, which means a time reduction by over 21 times compared with the fastest inscription time already reported in literature. The device has been fabricated in a single-mode mPOF with a core that has been doped with benzyl dimethyl ketal for photosensitivity enhancement. Moreover, we characterize the strain and temperature responses and the stability of the fabricated gratings response under different conditions in order to assess the viability for different applications.

  • bandpass transmission filters based on phase shifted fiber bragg gratings in Microstructured Polymer optical fibers
    Proceedings of SPIE, 2017
    Co-Authors: Beatriz Ortega, K. Nielsen, D Saezrodriguez, Yang Mi, Ole Bang
    Abstract:

    In this contribution we report on the fabrication of novel bandpass transmission filters based on PS-FBGs in Microstructured Polymer fibers at telecom wavelengths. The phase mask technique is employed to fabricate several superimposed gratings with slight different periods in order to form Moire structures with a single or various π phase shifts along the device. Simulations and experimental results are included in order to demonstrate very narrowband transmission filters. Experimental characterization under strain and temperature variations is provided in a non-annealed fiber and time stability of the fabricated devices has been also measured under different pre-strain conditions.

  • Zeonex-PMMA Microstructured Polymer optical FBGs for simultaneous humidity and temperature sensing
    Optics Letters, 2017
    Co-Authors: Getinet Woyessa, J.k.m. Pedersen, Andrea Fasano, Christos Markos, K. Nielsen, H.k. Rasmussen, Ole Bang
    Abstract:

    In this Letter, we report for the first time, to the best of our knowledge, the fabrication and characterization of a Zeonex/PMMA Microstructured Polymer optical fiber (mPOF) Bragg grating sensor for simultaneous monitoring of relative humidity (RH) and temperature. The sensing element (probe) is based on two separate in-line fiber Bragg gratings (FBGs) inscribed in the fabricated mPOF. A root mean square deviation of 0.8% RH and 0.6°C in the range of 10%–90% RH and 20°C–80°C was found. The developed mPOFBG sensor constitutes an efficient route toward low-cost, easy-to-fabricate and compact multi-parameter sensing solutions.

  • Simultaneous measurement of temperature and humidity with Microstructured Polymer optical fiber Bragg gratings
    Proceedings of SPIE - The International Society for Optical Engineering, 2017
    Co-Authors: Getinet Woyessa, J.k.m. Pedersen, Andrea Fasano, Christos Markos, K. Nielsen, H.k. Rasmussen, Ole Bang
    Abstract:

    © 2017 SPIE. A Microstructured Polymer optical fiber (mPOF) Bragg grating sensor system for the simultaneous measurement of temperature and relative humidity (RH) has been developed and characterized. The sensing head is based on two in-line fiber Bragg gratings recorded in a mPOF. The sensor system has a root mean square deviation of 1.04 % RH and 0.8 °C in the range 10 to 90% RH and 20 to 80 °C. The proposed sensor system is easy to fabricate, cheap and compact.

  • Zeonex Microstructured Polymer Optical Fibre Bragg Grating Sensor
    Photonics and Fiber Technology 2016 (ACOFT BGPP NP), 2016
    Co-Authors: Getinet Woyessa, Andrea Fasano, Christos Markos, Henrik Koblitz Rasmussen, Ole Bang
    Abstract:

    We fabricated an endlessly single mode and humidity insensitive Zeonex Microstructured Polymer optical fibre (mPOF) for fibre Bragg grating (FBG) temperature and strain sensors. We inscribed and characterise FBGs in Zeonex mPOF for the first time.

Alexander Argyros - One of the best experts on this subject based on the ideXlab platform.

  • Photonic band gap guiding in Microstructured Polymer optical fibres
    2020
    Co-Authors: Martijn A Van Eijkelenborg, Alexander Argyros, Ian Bassett, J. Zagari
    Abstract:

    Experimental and theoretical investigation of photonic band gap guidance in an air-core Microstructured Polymer optical fibre will be presented . Both conventional hexagonal-symmetry band gap fibres and air-core Bragg-guiding ring structures will be discussed.

  • Microstructured Polymer OPTICAL FIBRES -the exploration of a new class of fibres-
    2020
    Co-Authors: Martijn A Van Eijkelenborg, G. Barton, Alexander Argyros, N.a. Issa, Ian Bassett, S. Fleming, Matthew Fellew, Geoffrey Henry, S. Manos
    Abstract:

    Progress on Microstructured Polymer optical fibres (MPOFs), a new class of Polymer fibres that were developed last year, will be presented, including various single-mode MPOFs, highly birefringent MPOF, twin-core MPOF, nonlinear MPOF, graded-index MPOF and hollow core MPOF, the latter case being where light is guided in an air core.

  • Microstructured Polymer OPTICAL FIBRES: A NEW APPROACH TO POFS.
    2020
    Co-Authors: Maryanne C J Large, Alexander Argyros, N.a. Issa, S. Manos, Ian Bassett, S. Fleming, C Ross
    Abstract:

    One of the major problems in fabricating Polymer optical fibres is the difficulty in attaining a refractive index profile of choice, which requires careful control of the chemical composition. In addition, the use of dopants to modify the refractive index means that diffusion may be a problem. In this paper we describe a new approach to resolving these issues, which has many additional benefits. We have fabricated the first Microstructured Polymer optical fibres (MPOFs), in which the effective refractive index of the fibre is determined by the size and spacing of small holes, which run the length of the fibre. Both single mode and multimode fibres have been made from a single material (PMMA) without the use of dopants. These fibres have been tested and modeled. It is possible to use this approach to fabricate a variety of refractive index profiles.

  • Low Loss and Temperature Stable Microstructured Polymer Optical Fibers
    Journal of Lightwave Technology, 2012
    Co-Authors: Alexander Argyros, Sergio G. Leon-saval, Richard Lwin, Leon Poladian, Jerome Poulin, Maryanne C J Large
    Abstract:

    We report on a study of the loss mechanisms in Microstructured Polymer optical fibers (mPOF), resulting in the fabrication of mPOF with a loss equal to that of commercial Polymer optical fibers of 0.16 dB/m at 650 nm, nearing the limit imposed by material absorption. The contributions of confinement loss, macroscopic defects, microbending, and surface roughness are investigated and quantified. The temperature stability of mPOF is also investigated and is dependent on stresses introduced into the fiber during fabrication. A method for achieving stable operation up to 90 °C with a minimal increase in fiber loss is outlined.

  • strain sensing using long period gratings in Microstructured Polymer optical fibres
    21st International Conference on Optical Fibre Sensors (OFS21), 2011
    Co-Authors: Richard Lwin, Alexander Argyros, Sergio G Leonsaval, Maryanne C J Large
    Abstract:

    We investigate the use of long period gratings inscribed in single-mode Microstructured Polymer optical fibres for strain sensing. A simple inscription technique allows gratings to be inscribed with features at visible wavelengths, matching the transmission window of PMMA. Tracking of the grating features allows strains from 0.05% to over 20% to be detected, and the inscription of multiple gratings in the same fibre at different wavelengths allows for the possibility of distributed sensing.

Maryanne C J Large - One of the best experts on this subject based on the ideXlab platform.

  • Microstructured Polymer OPTICAL FIBRES: A NEW APPROACH TO POFS.
    2020
    Co-Authors: Maryanne C J Large, Alexander Argyros, N.a. Issa, S. Manos, Ian Bassett, S. Fleming, C Ross
    Abstract:

    One of the major problems in fabricating Polymer optical fibres is the difficulty in attaining a refractive index profile of choice, which requires careful control of the chemical composition. In addition, the use of dopants to modify the refractive index means that diffusion may be a problem. In this paper we describe a new approach to resolving these issues, which has many additional benefits. We have fabricated the first Microstructured Polymer optical fibres (MPOFs), in which the effective refractive index of the fibre is determined by the size and spacing of small holes, which run the length of the fibre. Both single mode and multimode fibres have been made from a single material (PMMA) without the use of dopants. These fibres have been tested and modeled. It is possible to use this approach to fabricate a variety of refractive index profiles.

  • Low Loss and Temperature Stable Microstructured Polymer Optical Fibers
    Journal of Lightwave Technology, 2012
    Co-Authors: Alexander Argyros, Sergio G. Leon-saval, Richard Lwin, Leon Poladian, Jerome Poulin, Maryanne C J Large
    Abstract:

    We report on a study of the loss mechanisms in Microstructured Polymer optical fibers (mPOF), resulting in the fabrication of mPOF with a loss equal to that of commercial Polymer optical fibers of 0.16 dB/m at 650 nm, nearing the limit imposed by material absorption. The contributions of confinement loss, macroscopic defects, microbending, and surface roughness are investigated and quantified. The temperature stability of mPOF is also investigated and is dependent on stresses introduced into the fiber during fabrication. A method for achieving stable operation up to 90 °C with a minimal increase in fiber loss is outlined.

  • strain sensing using long period gratings in Microstructured Polymer optical fibres
    21st International Conference on Optical Fibre Sensors (OFS21), 2011
    Co-Authors: Richard Lwin, Alexander Argyros, Sergio G Leonsaval, Maryanne C J Large
    Abstract:

    We investigate the use of long period gratings inscribed in single-mode Microstructured Polymer optical fibres for strain sensing. A simple inscription technique allows gratings to be inscribed with features at visible wavelengths, matching the transmission window of PMMA. Tracking of the grating features allows strains from 0.05% to over 20% to be detected, and the inscription of multiple gratings in the same fibre at different wavelengths allows for the possibility of distributed sensing.

  • Microstructured Polymer Optical Fibers Compared to Conventional POF: Novel Properties and Applications
    IEEE Sensors Journal, 2010
    Co-Authors: Maryanne C J Large, Douglas Blacket, Christian-alexander Bunge
    Abstract:

    While Polymers are not the traditional materials for optical fibers, Polymer optical fibers (POF) have a number of advantages over their glass counterparts for fiber sensors, particularly when coupled range of properties that can be produced using microstructures. This paper reviews some of the recent progress in Microstructured Polymer fiber sensors and compares them to conventional POF. Sensors considered include mechanical strain sensors and aqueous biosensors based on surface enhanced Raman spectroscopy (SERS) and surface plasmon resonance (SPR).

  • the role of viscoelastic properties in strain testing using Microstructured Polymer optical fibres mpof
    Measurement Science and Technology, 2009
    Co-Authors: Maryanne C J Large, Joshua Moran, Lin Ye
    Abstract:

    Optical fibre sensors have conventionally been made of silica. Polymers however have a much lower Young's modulus and higher elastic limit than silica, and can be incorporated into a larger range of materials. Whilst these properties make them attractive for using in mechanical sensing, using Polymers also brings complexity because of their viscoelastic response. In this work, we use long period gratings (LPG) in Microstructured Polymer optical fibre (mPOF) as a mechanical optical sensor. The effects of stress and strain on the sensor are decoupled and analysed independently. Through experiments and modelling we show that the effect of stress (as opposed to strain), and the relaxation of stress in the optical fibre during loading have a minimal effect.

Martijn A Van Eijkelenborg - One of the best experts on this subject based on the ideXlab platform.

N.a. Issa - One of the best experts on this subject based on the ideXlab platform.

  • Microstructured Polymer OPTICAL FIBRES -the exploration of a new class of fibres-
    2020
    Co-Authors: Martijn A Van Eijkelenborg, G. Barton, Alexander Argyros, N.a. Issa, Ian Bassett, S. Fleming, Matthew Fellew, Geoffrey Henry, S. Manos
    Abstract:

    Progress on Microstructured Polymer optical fibres (MPOFs), a new class of Polymer fibres that were developed last year, will be presented, including various single-mode MPOFs, highly birefringent MPOF, twin-core MPOF, nonlinear MPOF, graded-index MPOF and hollow core MPOF, the latter case being where light is guided in an air core.

  • Microstructured Polymer OPTICAL FIBRES: A NEW APPROACH TO POFS.
    2020
    Co-Authors: Maryanne C J Large, Alexander Argyros, N.a. Issa, S. Manos, Ian Bassett, S. Fleming, C Ross
    Abstract:

    One of the major problems in fabricating Polymer optical fibres is the difficulty in attaining a refractive index profile of choice, which requires careful control of the chemical composition. In addition, the use of dopants to modify the refractive index means that diffusion may be a problem. In this paper we describe a new approach to resolving these issues, which has many additional benefits. We have fabricated the first Microstructured Polymer optical fibres (MPOFs), in which the effective refractive index of the fibre is determined by the size and spacing of small holes, which run the length of the fibre. Both single mode and multimode fibres have been made from a single material (PMMA) without the use of dopants. These fibres have been tested and modeled. It is possible to use this approach to fabricate a variety of refractive index profiles.

  • Microstructured Polymer optical fibres
    2007
    Co-Authors: Martijn A Van Eijkelenborg, Alexander Argyros, N.a. Issa, Maryanne C J Large, S. Manos, Ian Bassett, J. Zagari, S. Fleming, R C Mcphedran, Martijn C De Sterke
    Abstract:

    The first Microstructured Polymer optical fibre is described. Both experimental and theoretical evidence is presented to establish that the fibre is effectively single moded at optical wavelengths. Polymer-based Microstructured optical fibres offer key advantages over both conventional Polymer optical fibres and glass Microstructured fibres. The low-cost manufacturability and the chemical flexibility of the Polymers provide great potential for applications in data communication networks and for the development of a range of new Polymer-based fibre-optic components.

  • Numerical aperture in Microstructured Polymer optical fibers
    Biomedical optics, 2005
    Co-Authors: N.a. Issa, M.a. Van Eijkelenborg, Clemens Von Korff Schmising, Whayne Padden
    Abstract:

    Microstructured or 'air-clad' fibers, with air holes surrounding a large core, have demonstrated much wider light acceptance angles than conventional fibers. Recently, a new method employing leaky modes has been used to determine the numerical aperture in highly multimode air-clad Microstructured fibers. It shows that an exceptionally high NA can only be achieved when bridge thickness is much smaller than the wavelength. The physical basis of these key results is understood in terms of the conditions for efficient excitation of bridge local modes, which radially propagate power into the outer jacket. A number of Microstructured Polymer optical fibers (mPOF) have been fabricated with a large core suspended by thin supporting bridges. Such mPOFs provide freedom in microstructure geometry, combined with greater mechanical flexibility. This makes them particularly suited to applications demanding high light capture efficiency from broad-beam sources with irregular shapes and in situations involving tight bends. A demonstration of the technology is presented and the measured numerical apertures of these fibres show robust agreement with theoretical calculations over a broad wavelength range.

  • Future directions for Microstructured Polymer optical fibers
    Photonic Crystal Materials and Devices II, 2004
    Co-Authors: Maryanne C J Large, G. Barton, Alexander Argyros, N.a. Issa, S. Manos, Whayne Padden, Geoffrey Henry, Leon Poladian, Martijn A Van Eijkelenborg
    Abstract:

    Microstructured Polymer Optical Fibers (MPOF) were first made in 2001, and subsequent development has aimed at exploiting the material and design opportunities they present. Most effort has been focused on developing approaches for high bandwidth MPOF, and investigating the properties of multimode Microstructured fibers. We also consider new applications in endoscopy and photonic interconnects, as well as the use of organic dopants in MPOF.