Abstract

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 0.1pm have allowed one to establish a refractive index detection limit of 2.1×105.

© 2010 Optical Society of America

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