Transmission properties of highly nonlinear photonic crystal fiber with huge air-fraction volume and doped core

Doped Photonic Crystal Fiber (PCF) confining the fundamental mode in a small high-index core can exhibits parabolic evolution of chromatic dispersion with two zero-dispersion points and flat negative chromatic dispersion over O-Band, S-Band, C-Band and L-Band. A generally accepted view is that the zero-dispersion point can be governed by selecting the appropriate diameter of a core. It allows for tuning the zero-dispersion wavelength over dozens of nanometers in the visible and near-infrared spectrum. By increasing the diameter of a core, first zero-dispersion wavelength is tuned into longer wavelengths. A complex study of factors influencing the selection of a zero-dispersion point and their mutual dependence has been provided. Another goal is potential extension of a flat-dispersion interval, optimization of the studied structure with the goal to obtain negative dispersion at wavelengths, which are commonly used in telecommunication for potential dispersion compensation. Normalized hole diameter affects the tuning of zero-dispersion wavelength.