Ultra-flattened near-zero dispersion PCF using selective liquid infiltration: A new study with four air-hole rings

We report here new results of chromatic dispersion in Photonic Crystal Fibers (PCFs) through designing the index-guiding triangular-lattice structure by selectively infiltrating the first air-hole ring with index-matching liquid. Our proposed structure can be implemented for both ultra-low and ultra-flattened dispersion in a wide wavelength range. The dependence of dispersion parameter of the PCF on infiltrating liquid indices, hole-to-hole distance and air-hole diameter are investigated in details. The results establish the design of ultra-flat dispersion of <;0±1.0ps/ (nm.km) achievable over a bandwidth of 400-614nm in the wavelength range of 1.30μm to 1.95μm. Six such designs with infiltrating liquid are proposed for near-zero ultra-flat dispersion realization.