Design of large negative dispersion and modal analysis for hexagonal, square, FCC and BCC photonic crystal fibers

This paper presents a numerical design for confinement of light in the core to analysis mode profiles and negative dispersion with the variation of air fill fraction d/A (0.4 - 0.8) for hexagonal, square, face center cubic (FCC), body center cubic (BCC) photonic crystal fibers. Five ring silica-air micro structures are used for the dispersion analyses with finite difference time domain (FDTD) and 3D mode solver are used for mode profiles analysis. Mode confinement of the PCFs is found increases with the air fill fraction d/A but higher negative dispersion found for lower values. Best performance is found for Hexagonal PCF with higher mode confinement and Square for higher negative dispersion -381.9 ps/nm/km for d/A= 0.70 at 550 nm wavelength.