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Proceedings Paper

Long-period fiber gratings in twisted single-mode fibers written by high-frequency CO[sub]2[/sub] laser pulses
Author(s): Tao Zhu; Yun-Jiang Rao Rao; King Seng Chiang; Cuihua Shi; Min Liu
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Paper Abstract

We discover that the rejection band of a long-period fiber grating written in a twisted single-mode fiber by a CO2 laser can split into two, when the twist applied to the fiber is relaxed after the writing of the grating. The wavelength split increases with the twist rate and the effect is independent of the polarization state of light. We attribute the observed phenomenon to the presence of a rotary frozen-in torsion stress along the fiber. Such a grating could find applications as a temperature-insensitive torsion sensor.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75037N (5 October 2009); doi: 10.1117/12.835267
Show Author Affiliations
Tao Zhu, Chongqing Univ. (China)
Univ. of Electronic Science & Technology (China)
Yun-Jiang Rao Rao, Chongqing Univ. (China)
Univ. of Electronic Science & Technology (China)
King Seng Chiang, Chongqing Univ. (China)
Univ. of Electronic Science & Technology (China)
City Univ. of Hong Kong (Hong Kong, China)
Cuihua Shi, Chongqing Univ. (China)
Min Liu, Chongqing Univ. (China)


Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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