To elastically design a dual-concentric-core photonic crystal fiber (DCC-PCF) for dispersion compensation, we use multi-layers of cladding holes as outer core rings. In previous study, the design of DCC-PCF with single outer core ring is difficult to give well consideration to wavelength-adjusting and maximum dispersion coefficient simultaneously. In this study, by using multi-layers of outer core ring, the maximum value of dispersion coefficient can be hold and the adjustment of the compensated wavelength is unrestricted. The design-elasticity enlarges the negative chromatic dispersion significantly. The numeric results indicate that the minimum chromatic dispersion of the previous 1-ring DCC-PCF is about -7700 ps/km-nm whereas that of the 3-ring DCC-PCF is about -10500 ps/km-nm at around a wavelength of 1.55 μm. Thus, the negative chromatic dispersion of the proposed structure is approximately 1.36 times larger than that of the previous one.
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