Simple and compact reflective refractometer based on tilted fiber Bragg grating inscribed in thin-core fiber

A simple and compact reflective refractometer based on a tilted fiber Bragg grating (TFBG) inscribed in an ultra-high photon-sensitive thin-core fiber is proposed and experimentally demonstrated. The reflective refractometer utilizes a short piece of thin-core fiber containing one TFBG to ensure the...

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Bibliographic Details
Published in:Optics letters 2014-01, Vol.39 (1), p.22-25
Main Authors: Gu, Bobo, Qi, Wenliang, Zheng, Jie, Zhou, Yanyan, Shum, Perry Ping, Luan, Feng
Format: Article
Language:English
Subjects:
Band spectra
Bands
Bragg gratings
Cladding
Fibers
Reflection
Refractometers
Spectra
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Summary:A simple and compact reflective refractometer based on a tilted fiber Bragg grating (TFBG) inscribed in an ultra-high photon-sensitive thin-core fiber is proposed and experimentally demonstrated. The reflective refractometer utilizes a short piece of thin-core fiber containing one TFBG to ensure the recoupling of cladding modes. The reflection spectra occur in two well-defined wavelength bands that correspond to the Bragg core mode and cladding modes, respectively. It is found that the power of the collected cladding modes changes with the external refractive index (RI), while that of the Bragg core mode remains unaffected and can be used as the temperature reference. High RI sensitivity and temperature immunity of the proposed reflective refractometer are experimentally achieved.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.39.000022