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Bend measurement using an etched fiber incorporating a fiber Bragg grating

Authors :
Abdul Rauf
Jianlin Zhao
Yajun Jiang
Wei Jiang
Biqiang Jiang
Source :
Optics Letters. 38:214
Publication Year :
2013
Publisher :
The Optical Society, 2013.

Abstract

A fiber Bragg grating (FBG) based bend measurement method using an etched fiber is proposed that utilizes the coupling of the core mode to the cladding and radiation modes at the bending region. An etching region of 99 µm diameter that serves as bend sensing head is achieved at 10 mm upstream the FBG through processing in 40% hydrofluoric acid, while the FBG acts as a narrowband reflector to enhance the sensitivity. The power variation curves are obtained for a wide range of bend angles, but the performance is limited due to the presence of the loss peaks. The sensing response is improved by immersing the etching region in a refractive index matching gel. The results are analyzed by using curve fitting formulas and are in good agreement. A large dynamic range of -27° to +27° and sensitivity of 0.43 dBm/deg is achieved, which can be enhanced by reducing the etched diameter.

Details

ISSN :
15394794 and 01469592
Volume :
38
Database :
OpenAIRE
Journal :
Optics Letters
Accession number :
edsair.doi.dedup.....eba81989c36ac0a5e431d99175306991
Full Text :
https://doi.org/10.1364/ol.38.000214