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Proceedings Paper

Bending sensitivity of long-period fiber gratings written in polarization-maintaining fiber by CO[sub]2[/sub] laser
Author(s): Jian Zou; Yunqi Liu; Dan Yang; Tingyun Wang
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Paper Abstract

We demonstrate the unique bending characteristics of the long-period fiber gratings (LPFGs) written in a panda polarization-maintaining (PM) fiber using CO2 laser. The bending sensitivity of the grating is not only sensitive to the direction of the fiber bending, but also dependent on the irradiation direction of the laser writing beam with respect to the principal axes of the PM fiber. The high sensitivity directional bending effect can be attributed to the asymmetric index distribution of the fiber cladding induced by both stress changes in the stress-applying parts of the PM fiber and high absorption of the CO2 laser at the exposure side, which may find promising application in fiber grating based bending sensors.

Paper Details

Date Published: 18 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77539K (18 May 2011); doi: 10.1117/12.886048
Show Author Affiliations
Jian Zou, Shanghai Univ. (China)
Yunqi Liu, Shanghai Univ. (China)
Dan Yang, Shanghai Univ. (China)
Tingyun Wang, Shanghai Univ. (China)

Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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