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The dual-concentric-core photonic crystal fiber composed of pure silica and air is proposed in this paper. Around 1.55 µm, it exhibits a negative chromatic dispersion as high as -5850 ps/km/nm. Based on multipole method, a systemic and in-depth simulation is realized to investigate the mode characteristics. The explanations to propagation states of the fundamental mode and the second mode are given elaborately. Finally, the variation of structural parameters is investigated to evaluate thedoi:10.1590/s0103-97332009000500001 fatcat:ip6aymfc3nag5i55zpzluuv5ta