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Characterization of Long-Period Fiber Gratings Written by CO _{2} Laser in Twisted Single-Mode Fibers

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6 Author(s)
Tao Zhu ; Key Lab. of Optoelectron. Technol. & Syst. (Educ. Minist. of China), Chongqing Univ., Chongqing, China ; Kin Seng Chiang ; Yun Jiang Rao ; Cui Hua Shi
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The rejection band of a long-period fiber grating written in a heavily twisted single-mode fiber by a CO2 laser can split into two, when the twist applied to the fiber is removed after the writing of the grating. We attribute the wavelength-splitting effect to the generation of a rotary frozen-in torsion strain along the fiber in the writing process. The wavelength split increases with the twist rate and the effect is independent of the polarization state of light. We present a simple expression to estimate the wavelength split, which agrees reasonably well with the experimental results. We also measure the temperature and torsion characteristics of the grating. Such a grating could find applications as an optical filter or a temperature-insensitive torsion sensor.

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Lightwave Technology, Journal of  (Volume:27 ,  Issue: 21 )