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We investigated the longitudinal periodic index profile of a Ge-doped suspended core fibre by systemically studied the FBG spectrum. The core refractive index varied <;;0.03% along its length with a period of 650-μm.
We demonstrate a novel method for low-loss splicing Ge-doped holey fibers (HF) with subwavelength core size and high numerical aperture fibers by using a conventional fusion splicer. We found that a large overlap distance of the fibers during fusion would decrease the splice loss and increase the splice strength. The lowest splice loss achieved for a fiber with a core diameter of 1.27 mu m and air-filling...
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