Effect of germanium doping on the performance of silica based photonic crystal fiber

In present communication, a germanium doped hexagonal photonic crystal fiber is presented to obtain highly nonlinear coefficient with flat dispersion property for supercontinuum generation applications. The dispersion in the hexagonal photonic crystal fiber can be modified by doping level of germanium along with its geometrical parameters. As a result of this doping nonlinear coefficient of 0.0166 W−1 m−1 and the flattened dispersion of less than the −11.8 ps/(nm.km) are obtained at 1.55 μm. The numerical results confirmed that the proposed germanium doped hexagonal photonic crystal fiber could be used for wideband supercontinuum generation. In comparison with other reported papers our suggested photonic crystal fiber provides much better nonlinear coefficient with flat dispersion for supercontinuum generation.