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Study on dispersion of photonic crystal fiber

Dispersion properties of photonic crystal fiber of fused silica with hexagonally-arranged air holes in its cladding have been investigated by using the finite-difference beam propagation method. The dependence of different PCF geometrical parameters namely the air-hole diameter and the pitch were carried out in detail. The numerical simulation results indicate that the values of dispersion monotonically reduce with the increase of air-hole diameter, and dispersion slope keep almost constant with the increase of air-hole diameter. It is also reveal that the dispersion curve is up shifted with decrease the value of pitch. We have obtained one near zero flattened dispersion with value of between -0.1~0.58ps/(km·nm) in the wavelength from 1.31 μm to 1.58 μm. Photonic crystal fiber with near zero flattened dispersion properties is of great significance to the optical fiber communication.