Four-Mode Coupling in Fiber Bragg Grating Sensors Using Full Fields of the Fundamental Modes |
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| Authors: | Hala J. El-Khozondar Mathias S. Müller Corbinian Wellenhofer Rifa J. El-Khozondar Alexander W. Koch |
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| Affiliation: | 1. Electrical Engineering Department , Islamic University of Gaza , Gaza, Palestinian Territory;2. Institute for Measurement Systems and Sensor Technology, Electrical Engineering and Information Technology Department, Technical University Munich , Munich, Germany;3. Physics Department , Al-Aqsa University , Gaza, Palestinian Territory |
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| Abstract: | Abstract 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 measurements. In a recent work, these coupling coefficients were derived using a set of assumptions on the properties of the fiber's modes. However, the validity of these approximations was not explicitly tested. Here, the required coupling coefficients are computed, making use of the full-field components. It is demonstrated that additional terms will appear; however, they are negligible in practical fibers, and thus, the made approximations are valid. |
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| Keywords: | Bragg gratings coupled-mode analysis polarization optical fiber measurements optical fiber transducers shear strain |
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