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| Studied in this paper is the influence on the high-index-core Bragg fiber dispersion properties imposed by low-index-layer filling ratio variance in different rings within the cladding, using a full-vector finite element method. The confinement loss of dispersion-flattened high-index-core Bragg fibers is evaluated to be huge due to the small low-index-layer filling ratio. Moreover, nearly-zero flattened dispersion over wide wavelength range around 1550nm, by numerical simulation, is demonstrated in one-dimensional high-index-core microstructured optical fibers with non-uniform low-index-layer filling ratio in different rings. The results show that both flattened dispersion and low confinement loss can be achieved with finite low-index-layer rings. |
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| Keywords:Bragg fiber, dispersion, confinement loss, finite element, microstructured optical fiber |
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