Efficient interrogation method of forward Brillouin scattering in optical fibers using a narrow bandwidth long-period grating
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Efficient interrogation method of forward Brillouin scattering in optical fibers using a narrow bandwidth long-period grating

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Efficient interrogation method of forward Brillouin scattering in optical fibers using a narrow bandwidth long-period grating

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Sánchez, L. A.; Díez, A.; Cruz, J. L.; Andrés, Miguel V. Perfil
This document is a artículoDate2020
A new technique for the characterization of the effective refractive index modulation in optical fibers due to transverse acoustic mode resonances excited by electrostriction is reported. Resonances excited by an optical pulse are probed by a narrow bandwidth longperiod grating (LPG) inscribed in the fiber, which is interrogated by a CW beam. The LPG used in this experiment has a narrow bandwidth and high sensitivity to small mode index perturbations, allowing the measurement of index variations from below 10-9 to 10-6. Radial and torsional-radial acoustic modes were characterized up to 1.1 GHz. The linewidth of resonances was found to be much shorter than in previous reports in which long fiber lengths are typically required, obtaining Q factors as high as 5000.

    L. A. Sánchez, A. Díez, J. L. Cruz, and M. V. Andrés, “Efficient interrogation method of forward Brillouin scattering in optical fibers using a narrow bandwidth long-period grating”, Optics Letters, Vol 45, pp. 5331-5334, 2020.
https://doi.org/10.1364/OL.402783

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