Dispersion-compensation improvement for dual-concentric-core photonic crystal fibers

To achieve a dispersion-compensation photonic crystal fiber with a larger negative chromatic dispersion coefficient, this paper theoretically investigates a structure modified by dual-concentric-core photonic crystal fibers (DCC-PCF). By enlarging the holes of inner cladding in order to increase the slope difference of index-curves between two supermodes, the negative chromatic dispersion coefficient is significantly enlarged. The results indicate that the numeric result of the negative chromatic dispersion coefficient for the proposed DCC-PCF is approximately 1.6 times greater than that of the previous work at around a wavelength of 1.55 μm.