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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 demonstrated the fabrication of the chiral long-period grating (CLPG) with the helical structures by twisting conventional single-mode fibre while the fibre was exposed unilaterally by CO2 laser. The bending and surrounding refractive index characteristics of the fabricated CLPG were investigated experimentally. Experimental results show that the CLPG has high bending sensitivity of 19.336 nm/m...
We demonstrated experimentally the fabrication of the long-period fiber gratings (LPFGs) in the micro-structure fiber under external tension with high repeatability by CO2 laser. The micro-structure specialty fiber consists of a germania-doped core and a pure silica cladding with a nano-engineered ring that includes non-periodical nanometer-sized gas filled voids. The characteristics of grating growth...
We studied experimentally the bending sensitivity of long-period fiber gratings (LPFGs) written by CO2 laser under external tension. Not only higher sensitivity was observed, but also the LPFG was sensitive to the bending direction, which can be attributed to the laser-induced asymmetric index modification across the fiber section.
We demonstrate experimentally that the new resonance dips can be generated during the fabrication of CO2 laser written long-period fiber gratings (LPFGs) in a single-mode fiber (SMF) under tension. The dynamic analysis of laser writing process was adopted to study the mechanism of the grating inscription. The new characteristics of grating growth were observed except for the increase of writing efficiency...
We demonstrate the generation of wavelength-switchable picosecond pulses using a self-seeded Fabry-Perot laser diode and a tilted multimode fiber Bragg grating, where wavelength selection is achieved by changing the modal distribution in the grating.
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