Bài báo khoa học

We report the numerical simulation of photonic crystal fibers with zero-dispersion wavelength (ZDW) varying according to their structural parameters. These fibers are designed with a difference in the diameter of the air holes between the rings to control dispersion and nonlinearity. In case the hole pitch is small, dispersion properties are quite diverse including all-normal and anomalous dispersion curves with one or two ZDWs. For the large ones, it is possible to achieve anomalous dispersion for all structures. On the ground of the good confinement of light in the core of PCFs, the ZDW value increases when the hole pitch is larger. ZDW1 shifts to shorter wavelengths with the increase in the filling factor, while the opposite is true for ZDW2. The nanometer-scale shift of the ZDWs will be applied to create supercontinuum light sources.