Long-period fiber gratings in twisted single-mode fibers written by high-frequency CO[sub]2[/sub] laser pulses

Tao Zhu; Yun-Jiang Rao Rao; King Seng Chiang; Cuihua Shi; Min Liu

doi:10.1117/12.835267

5 October 2009 Long-period fiber gratings in twisted single-mode fibers written by high-frequency CO₂ laser pulses

Tao Zhu, Yun-Jiang Rao Rao, King Seng Chiang, Cuihua Shi, Min Liu

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75037N (2009) https://doi.org/10.1117/12.835267
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

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.

Citation Download Citation

Tao Zhu, Yun-Jiang Rao Rao, King Seng Chiang, Cuihua Shi, and Min Liu "Long-period fiber gratings in twisted single-mode fibers written by high-frequency CO₂ laser pulses", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75037N (5 October 2009); https://doi.org/10.1117/12.835267

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