Bending sensitivity of long-period fiber gratings written in polarization-maintaining fiber by CO[sub]2[/sub] laser

Jian Zou; Yunqi Liu; Dan Yang; Tingyun Wang

doi:10.1117/12.886048

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18 May 2011 Bending sensitivity of long-period fiber gratings written in polarization-maintaining fiber by CO₂ laser

Jian Zou, Yunqi Liu, Dan Yang, Tingyun Wang

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Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77539K (2011) https://doi.org/10.1117/12.886048
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

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.

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Jian Zou, Yunqi Liu, Dan Yang, and Tingyun Wang "Bending sensitivity of long-period fiber gratings written in polarization-maintaining fiber by CO₂ laser", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77539K (18 May 2011); https://doi.org/10.1117/12.886048

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