Characterization of long-period fiber gratings written by CO2 laser in twisted single-mode fibers

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Tao Zhu
  • Yun Jiang Rao
  • Cui Hua Shi
  • Yun Song
  • Min Liu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)4863-4869
Journal / PublicationJournal of Lightwave Technology
Volume27
Issue number21
Publication statusPublished - 1 Nov 2009

Abstract

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. © 2009 IEEE.

Research Area(s)

  • Gratings, Optical fiber devices, Optical fiber filters, Sensors

Citation Format(s)

Characterization of long-period fiber gratings written by CO2 laser in twisted single-mode fibers. / Zhu, Tao; Chiang, Kin Seng; Rao, Yun Jiang; Shi, Cui Hua; Song, Yun; Liu, Min.

In: Journal of Lightwave Technology, Vol. 27, No. 21, 01.11.2009, p. 4863-4869.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal