25 June 2007 Determination of the fiber birefringence induced by transversal loads by means of fiber Bragg gratings
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The application of transversal strain on an optical fiber leads to an asymmetry of the fiber section that locally induces fiber birefringence. In this paper, we show that it is possible to use FBG as a probe to obtain the amount of this induced birefringence. We describe two techniques able to get the birefringence value. They are both based on differential group delay (DGD) measurement. The first technique makes use of the comparison between the measurement and the simulation of the wavelength dependency of grating DGD. Considering that all grating parameters are known, we adjust the birefringence value to obtain the best fit between experiment and simulation. For the second technique, we first demonstrate that the wavelength dependencies of chromatic dispersion (CD) and DGD parameters differ in their amplitude by a quantity proportional to the birefringence. We exploit this relationship to get the birefringence value by separately measuring the DGD and CD spectral evolutions. The birefringence value is adjusted to obtain the best fit between the two measurements. These two techniques are discussed and experimental results are finally reported.
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S. Bette, S. Bette, C. Caucheteur, C. Caucheteur, R. Garcia-Olcina, R. Garcia-Olcina, M. Wuilpart, M. Wuilpart, S. Sales, S. Sales, J. Capmany, J. Capmany, P. Mégret, P. Mégret, } "Determination of the fiber birefringence induced by transversal loads by means of fiber Bragg gratings", Proc. SPIE 6593, Photonic Materials, Devices, and Applications II, 659304 (25 June 2007); doi: 10.1117/12.724280; https://doi.org/10.1117/12.724280

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