Square-hexagonal nanostructured photonic crystal fiber at 1550 nm wavelength

Photonic crystal fibers (PCFs) are widely used in optical communications systems, nonlinear devices, gas sensors, high power transmission, and so on. Photonic crystal fiber with minimum values of confinement loss, nonlinear effects, and chromatic dispersion is used in optical communication. But in some applications, high nonlinear coefficient is required. This paper presents new design of index-guiding photonic crystal fiber (IGPCF) with characteristics appropriate for nonlinear applications. In the present design with a square-hexagonal nano-structure having air holes with unequal diameters, nearly zero dispersion at the wavelength range of 1540 to 1550 nm is achieved. The simulation results reveal that the slope of chromatic dispersion is obtained as -0.05 ps/(km.nm). The confinement loss is less than 10 -12 dB/cm and the nonlinear coefficient reaches 8.380 W -1 .km -1 .