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We propose the fabrication of double-helix chiral long-period fiber grating by twisting polarization-maintain fiber when the fiber is heated by CO2 laser irradiation. Different with conventional long-period fiber grating, the chiral grating is found to be insensitive to the fiber bending due to its helical waveguide structure.
We demonstrate experimentally the fabrication of the long-period fiber gratings in the twisted polarization-maintaining fiber using CO2 laser. Thanks to the asymmetric and helical index modulation along the fiber, the unique index and bending characteristics of the twisted gratings can be achieved, which could be useful for practical sensing applications.
We demonstrate the fabrication of long-period fiber gratings (LPFGs) written by CO2 laser in different micro-structure specialty fibers. The characteristics of grating growth were studied by using the dynamic analysis of laser writing process. It can be believed that the residual stress relaxation, glass structure changes, and frozen of the non-uniformed external stress account for the formation of...
We demonstrated experimentally the fabrication of tilted long-period fiber gratings (LPFGs) with different tilt angles by CO2 laser. The experiment results reveal that the LPFGs written with different tilt angles have quite different transmission spectra, the polarization sensitive LPFGs can be written with large tilt angles by the CO2 laser.
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