Hexagonal-Circular Photonic Crystal Fiber with Low Chromatic Dispersion, Low Confinement Loss, and Low Nonlinearity

Photonic crystal fibers (PCFs) as waveguides with low dispersion, low confinement loss, and low nonlinearity can be used in optical telecommunication systems. In this paper, a hexagonal-circular photonic crystal fiber is proposed. In the first design, we present a hexagonal PCF with 70 ps/nm.km dispersion at 1550 nm wavelength. The confinement loss and nonlinearity of this structure are respectively obtained as 0.6×10-12dB/cm and 8.988 W-1km-1. In the second design, by improving th e primary structure as hexagonal-circular PCF, the nearly zero dispersion is obtained. The simulation results show that the confinement loss and nonlinearity of the improved structure are 8×10-11 dB/cm and 7.956 W-1km-1, respectively.