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El-Khozondar H.J.,TU Munich | El-Khozondar H.J.,Islamic University of Gaza | Muller M.S.,TU Munich | Buck T.C.,TU Munich | And 3 more authors.
Fiber and Integrated Optics | Year: 2010

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 sensing applications, where perturbations, such as strains, are conventionally given in a fixed laboratory reference frame. Hence, the derived theory can easily be integrated into existing formulations in the laboratory reference frame. This work demonstrates the experimental verification of the derived theory. An optical fiber is mechanically twisted using an automated test stand, and the change in polarization is recorded. The results are consistent with the theory. Copyright © Taylor & Francis Group, LLC. Source

El-Khozondar H.J.,Islamic University of Gaza | Muller M.S.,TU Munich | El-Khozondar R.J.,Al Aqsa University | Koch A.W.,TU Munich
2011 ICO International Conference on Information Photonics, IP 2011 | Year: 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 used as replacement for EM transducers for their immunity to the EM interference. However, the sensitivity to currents depends on the Verdet constant which is low in optical fiber but the optical path length can be increased to compensate for it by winding the fiber around a current carrying element a large number of turns. In this work, we would like to study the effect of the inhomogeneity of the magnetic field induced by the current in the sensitivity of the optical fiber sensor. © 2011 IEEE. Source

El-Khozondar H.J.,TU Munich | El-Khozondar R.J.,Al Aqsa University | Shabat M.M.,Islamic University of Gaza | Koch A.W.,TU Munich
Optik | Year: 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 on the behavior of nonlinear-magnetooptic isolator is studied. The isolator consists of metal film, nonlinear cladding, and magnetooptic substrate. It is found that difference between forward and backward propagation for TM0 mode increases with increasing the absolute value of the tuning parameter which is the permittivity of the metal film, εf. It is also found that the maximum cut-off thickness of the isolator occurs in self-defocusing case around η = 0.65 and at the highest assumed value of εf = -8. These results are helpful in fabricating an isolator with high performance. © 2010 Elsevier GmbH. All rights reserved. Source

Radwan M.A.,Al Aqsa University | Sumour M.A.,Al Aqsa University | Elbitar A.M.,Islamic University of Gaza | Shabat M.M.,Islamic University of Gaza | Lima F.W.S.,Federal University of Piaui
International Journal of Modern Physics C | Year: 2016

In scale-free Barabási–Albert (BA) networks, we study the finite-size effect at different number m of neighbors. So, we investigate the effects of finite network size N for the recently developed semi-directed BA networks (SDBA1 and SDBA2) at fixed (Formula presented.)) and show and explain the gap in the distribution of the number (Formula presented.) of neighbors of the nodes i. © 2016 World Scientific Publishing Company Source

El-Aila H.J.Y.,Al Aqsa University
Journal of Dispersion Science and Technology | Year: 2010

In this article, a mononuclear Mn(Niten)2H2O complex was prepared to catalyze hydrolysis of p-nitrophenyl acetate (PNPA) in presence of Cetyltrimethylammonium bromide (CTAB) micellar system in different pH range from 6.5-10 at 25°C. These results obtained indicate that the complex exhibits good catalytic function. It also appears the complex accelerates the hydrolytic cleavage of PNPA in cationic CTAB micellar solution which may be due to coordinating ability of substrate to complex, electrostatic interaction between micelles and complex and due to electrostatic interaction between micelles with reactant. © Taylor & Francis Group, LLC. Source

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