Abstract
In this work a comparative analysis of dispersion properties of hollow core photonic crystal fibers (HC PCFs) and negative curvature hollow core fibers (NCHCFs) was carried out. It was shown that the main reason for the low dispersion slope of NCHCFs is a strong light localization in the air core in comparison with HC PCFs. The strong light localization in NCHCFs allows not to use the complicated photonic crystal cladding and to reduce the air mode interaction with silica glass elements of the cladding. This conclusion was confirmed by experimental measurement of the group velocity dispersion and femtosecond pulse transmission for the NCHCF.
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