Elliptical hybrid cladding borosilicate photonic crystal fiber design for minimum chromatic dispersion

Photonic crystal fibers (PCF) are more flexible absorbing and promising than conventional optical fiber. In this paper we proposed a new design elliptical hybrid cladding borosilicate photonic crystal fiber with flattened dispersion characteristics by changing the diameter of circular air-holes of the third ring and forth ring into elliptical air hole. Finite Difference Time Domain (FDTD) method and transparent boundary condition (TBC) is used to analyze the dispersion property in a high-index core PCF. This method produced best result at third attenuation coordinate (1.55μm) over 1.4 μm to 1.8 μm wavelength range and found the dispersion is minimum (±0.81ps/km.nm)and ultra flattened that has better performance than conventional photonic crystal fiber. It is also shown that borosilicate glass PCF provides much better dispersion as compared to silica of the same structure, so such PCF have high potential to be used as a dispersion compensating fiber in optical window.