Study of ultraflattened dispersion square-lattice photonic crystal fiber with low confinement loss

Abstract:

A new type ultraflattened dispersion square-lattice photonic crystal fiber with two different air-hole diameters in cladding region is proposed and the dispersion is investigated using a compact 2-D finite difference frequency domain method with the anisotropie perfectly matched layers (PML) absorbing boundary conditions. Through numerical simulation and opti-mizing the geometrical parameters, we find that the photonie crystal fibers proposed can realize ultrafiattened dispersion of 0±0.06 ps/(km·nm) in wavelength range of 1.375 μm to 1.605 μm, which is more fiat than that of triangular PCF, and the confinement loss is as low as about 0.01 dB/km at wavelength of 1.55 μm.