5 October 2009 Long-period fiber gratings in twisted single-mode fibers written by high-frequency CO2 laser pulses
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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.
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Tao Zhu, Tao Zhu, Yun-Jiang Rao Rao, Yun-Jiang Rao Rao, King Seng Chiang, King Seng Chiang, Cuihua Shi, Cuihua Shi, Min Liu, 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); doi: 10.1117/12.835267; https://doi.org/10.1117/12.835267
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