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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 27, Iss. 21 — Nov. 1, 2009
  • pp: 4863–4869

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

Tao Zhu, Kin Seng Chiang, Yun Jiang Rao, Cui Hua Shi, Yun Song, and Min Liu

Journal of Lightwave Technology, Vol. 27, Issue 21, pp. 4863-4869 (2009)


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Abstract

The rejection band of a long-period fiber grating written in a heavily twisted single-mode fiber by a CO$_{2}$ 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.

© 2009 IEEE

Citation
Tao Zhu, Kin Seng Chiang, Yun Jiang Rao, Cui Hua Shi, Yun Song, and Min Liu, "Characterization of Long-Period Fiber Gratings Written by CO$_{2}$ Laser in Twisted Single-Mode Fibers," J. Lightwave Technol. 27, 4863-4869 (2009)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-27-21-4863

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