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

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 f...

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Bibliographic Details
Published in:Optics letters 2010-02, Vol.35 (4), p.613-615
Main Authors: MOSQUERA, L, SAEZ-RODRIGUEZ, D, CRUZ, J. L, ANDRES, M. V
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Gratings
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Optical elements, devices, and systems
Optical instruments, equipment and techniques
Optics
Physics
Refractometers and reflectometers
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Summary: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).
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.35.000613