Tailoring of nearly zero flattened dispersion photonic crystal fibers

This work theoretically tailored the dispersion in a photonic crystal fiber (PCF), and then designed two types of nearly zero dispersion flattened PCFs (DFPCFs) by rod-doping or liquid-filling some of the cladding holes. The numeric results show that the DFPCF type 1, rod-doped with arbitrary indices, achieves the dispersion values between 0±1 ps/nm km over a bandwidth range of 460 nm. The DFPCF type 2, filled with the available liquids, performs the dispersion values between 0±1.5 ps/nm km over a bandwidth range of 520 nm. Finally, the confinement losses of the two types of DFPCFs are estimated. The numeric results show that the confinement losses of the two types of the proposed DFPCFs are extremely low, in the order of 10−5 or 10−6 dB/km, which even can be disregarded.