Now showing items 1-15 of 15

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      Analytical solution of four-mode coupling in shear strain loaded fiber Bragg grating sensors

      MüLLER, Mathias S.; El-Khozondar, Hala J.; Buck, Thorbjörn C; Koch, Alexander W (Optical Society of America, 2009)
      The polarization-dependant reflection spectra of fiber Bragg grating (FBG) sensors in polarization-maintaining fibers are influenced by shear strain. This influence can be evaluated from a tensorial coupled-mode theory ...
    • Experimental investigation of polarization rotation in twisted optical fibers

      El-Khozondar, Hala J.; Muller, Mathias S; Buck, Thorbjorn C; El-Khozondar, Rifa J.; Koch, Alexander W (IEEE, 2009)
      The twist induced polarization rotation in birefringent optical fibers is well understood and has been treated in the late seventies. We recently derived a formulation of the polarization rotation in twisted optical fibers ...
    • Experimental investigation on polarization rotation in twisted optical fiber using laboratory coordinate system

      El-Khozondar, Hala J.; MüLLER, Mathias S.; Buck, Thorbjörn C; El-Khozondar, Rifa J.; Koch, Alexander W (Taylor & Francis Group, 2009)
      Recently, a formulation of the polarization rotation in twisted optical fibers was derived using a coupled-mode approach that, other than existing theories, employs a fixed reference frame. This is interesting for fiber ...
    • Four-Mode Coupling in Fiber Bragg Grating Sensors Using Full Fields of the Fundamental Modes

      El-Khozondar, Hala J.; MüLLER, Mathias S.; Wellenhofer, Corbinian; El-Khozondar, Rifa J.; Koch, Alexander W (Taylor & Francis Group, 2010)
      The four-mode coupling in shear-strain-loaded fiber Bragg grating sensors has been demonstrated to have influence on the measured spectra and, thus, on the application of embedded fiber Bragg gratings for strain field ...
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      Influence of magnetic field inhomogeneity on a magneto-optical current sensor

      El-Khozondar, Hala J.; MüLLER, Mathias S.; El-Khozondar, Rifa J.; Koch, Alexander W (Scientific Research Publishing, 2012)
      The growth in the capacity of electric power system creates a demand for the protection of relaying systems. Optical current transducers—OCT that are mainly made up of single mode optical fibers which are subjected to ...
    • Magnetic field inhomogeneity induced on the magneto-optical current sensors

      El-Khozondar, Hala J.; MüLLER, Mathias S.; El-Khozondar, Rifa J.; Koch, Alexander W (IEEE, 2011)
      The growth in the capacity of electric power system creates a necessity demand on protection relaying systems. Optical current transducers (OCT) which are mainly single mode optical fiber subjected to Faraday rotation are ...
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      Measurement errors from internal shear strain within fiber-Bragg-grating sensors

      MüLLER, Mathias S.; Buck, Thorbjörn C; El-Khozondar, Hala J.; Koch, Alexander W (International Society for Optics and Photonics, 2009)
      Fiber-Bragg-grating (FBG) sensors have become commercially available sensors for the measurement of temperature, strain and many other quantities. The sensor information is encoded in the spectral reflection characteristic ...
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      Metallic nonlinear magnetooptical nonreciprocal isolator

      El-Khozondar, Hala J.; El-Khozondar, Rifa J.; Shabat, Mohammed M.; Koch, Alexander W (Urban & Fischer, 2011)
      In advanced optical fiber communication systems where reflection light might cause degradation of the signal quality, optical waveguide isolators play an important role. The effect of a metal layer with negative permittivity ...
    • Method for strain tensor reconstruction with embedded fiber Bragg grating sensors

      Grassi, Ana Perez; MüLLER, Mathias S.; Bernardini, A; El-Khozondar, Hala J.; Koch, Alexander W (IOP Publishing, 2011)
      Fiber Bragg grating (FBG) sensors are being considered for health and condition monitoring of composite structures, where they may be embedded inside the material during the fabrication process. So far, research efforts ...
    • On-line thickness measurement for two-layer systems on polymer electronic devices

      Grassi, Ana Perez; Tremmel, Anton J; Koch, Alexander W; El-Khozondar, Hala J. (Multidisciplinary Digital Publishing Institute, 2013)
      : During the manufacturing of printed electronic circuits, different layers of coatings are applied successively on a substrate. The correct thickness of such layers is essential for guaranteeing the electronic behavior ...
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      Polarization rotation in twisted polarization maintaining fibers using a fixed reference frame

      El-Khozondar, Hala J.; Muller, Mathias S; El-Khozondar, Rifa J.; Koch, Alexander W (IEEE, 2009)
      In previous studies addressing polarization evolution in optical fibers, the frame of reference in which polarization rotation in twisted optical fibers is described lacks the compatibility with the modeling of some fiber ...
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      Sensitivity of TM nonlinear magnetooptical integrated optical sensor

      El-Khozondar, Hala J.; El-Khozondar, Rifa J.; MüLLER, Mathias S.; Koch, Alexander W (Emerald Group Publishing Limited, 2012)
      Purpose – The purpose of this paper is to consider a detailed investigation of transversal magnetic (TM) nonlinear magnetooptical integrated optical sensor. The sensitivities of two sensors are presented. The first sensor ...
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      Shear strain influence on fiber Bragg grating measurement systems

      MüLLER, Mathias S.; Buck, Thorbjörn C; El-Khozondar, Hala J.; Koch, Alexander W (IEEE, 2009)
      Fiber Bragg grating (FBG) sensors have become commercially available sensors for the measurement of temperature, strain, and many other quantities. One interesting application is the embedding of these sensors, during which ...
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      Transfer matrix approach to four mode coupling in fiber Bragg gratings

      Muller, Mathias S; El-Khozondar, Hala J.; Bernardini, Alessandro; Koch, Alexander W (IEEE, 2009)
      Shear strain effects within fiber Bragg grating sensors have been neglected in the theoretical treatment of these devices. Shear strains do however occur in everyday applications and additionally shear strains do change ...
    • Twist Effect on Polarization Maintaining Fiber

      El-Khozondar, Hala J.; MüLLER, Mathias S.; El-Khozondar, Rifa J.; Koch, Alexander W (2009)
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