A novel ultra-flattened chromatic dispersion using defected elliptical pores photonic crystal fiber with low confinement losses

This paper reports a novel design in photonic crystal fiber (PCF) with nearly zero ultra flattened dispersion characteristics. We describe the chromatic dispersion controllability taking non-uniform air hole structures into consideration. Through optimizing non-uniform air hole structures, the ultra flattened zero dispersion PCF can be efficiently designed. We show numerically that the proposed triple non-uniform air cladding structure successfully achieves flat dispersion characteristics as well as extremely low confinement loss. As an example, the proposed PCF with flattened dispersion of plusmn0.28 ps/km/nm from 1.5 mum to 1.8 mum wavelength with extremely low confinement loss of less than 10^-11 dB/m.