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
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