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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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Valencià Castellano

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IMPORTANT: Aquest repositori està en una versió antiga des del 3/12/2023. La nova instal.lació está en https://roderic.uv.es/

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

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Sánchez Domínguez, Luis Alberto; Díez Cremades, Antonio; Cruz Muñoz, José Luis; Andrés, Miguel V.

Aquest document és un/a article, creat/da en: 2020

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.

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