Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 27, Issue 21, Pages 4863-4869Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2009.2029542
Keywords
Gratings; optical fiber devices; optical fiber filters; sensors
Funding
- Natural Science Foundation of China [60807019, 60537040]
- Natural Science Foundation [CSTC2008BB2165]
- Innovation Ability Training Foundation of Chongqing University
- Program for NCET [NCET-08-0602]
- University of Electronic Science and Technology of China
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The rejection band of a long-period fiber grating written in a heavily twisted single-mode fiber by a CO 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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