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Opt Lett. 2010 Feb 15;35(4):613-5. doi: 10.1364/OL.35.000613.

In-fiber Fabry-Perot refractometer assisted by a long-period grating.

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Facultad de Ingeniería Civil, Universidad Nacional de Ingeniería, Avenida Tupac Amaru 210, El Rimac,PE-Lima 025 Lima, Peru.


We present an optical fiber refractometer based on a Fabry-Perot interferometer defined by two fiber Bragg gratings and an intracavity long-period grating that makes the light confined in the resonator interact with the surrounding medium. The external refractive index is monitored by the resonant frequencies of the Fabry-Perot interferometer, which can be measured either in transmission or in reflection. In this first experiment, wavelength shifts measured with a resolution of 0.1 pm have allowed one to establish a refractive index detection limit of 2.1x10(-5).

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