A highly nonlinear photonic quasi-crystal fiber with low confinement loss and flattened dispersion

Abstract

We proposed a novel photonic quasi-crystal fiber with near-zero flattened dispersion, highly nonlinear coefficient, and low confinement loss by using the dual concentric core structure. By optimizing the structure parameter, the proposed photonic quasi-crystal fiber can achieve a nonlinear coefficient larger than 33W−1km−1 and near-zero flatten dispersion of 0±3.4ps/nm/km with a near-zero dispersion slope of 8.5×10−3ps/nm2/km at the wavelength of 1550nm. Near-zero flattened dispersion and low confinement loss in the ultralow order of 10−7dB/m are simultaneously obtained in the wavelength range from 1373 to 1627nm. Furthermore, two zero dispersion wavelengths can be achieved in a wide wavelength ranger from 1373 to 1725nm. From the point of view of practical fabrication, the influence of deviation of each air hole diameter within 3% of imperfections on dispersion, nonlinearity, and is discussed to verify the robustness of our design.