Abstract
A novel all-fiber temperature-calibrated refractometer based on a compact
fiber Bragg grating (FBG) single-multi-single (SMS) structure is proposed and
experimentally demonstrated. The sensor head is composed of a FBG combined with a
SMS structure, in which the middle multimode fiber (MMF) section is etched by a
time-controlled hydrofluoric. The transmission dip of SMS is extremely sensitive to
ambient refractive index (RI) variation, whereas the upstream FBG provides the
necessary temperature information for RI calibration. All aforementioned functions
are performed via a compact FBG-SMS structure not longer than 25 mm. The proposed
sensing device provides a linear RI sensitivity over water or waterbased solutions
(RI values near 1.33 at optical wavelengths for most biological and many
environmental applications), and has temperature-calibration capability. Hence, the
said refractometer is a good candidate for sensing in chemical and biological
applications.
© 2012 Chinese Optics Letters
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