Comparison of Chromatic Dispersion of Circular and Hexagonal Photonic Crystal Fibers with Chloroform-Core

In this paper, we compare dispersion characteristics of chloroform-core photonic crystal fibers (PCFs) with circular lattice and hexagonal lattice in the case of different air hole diameters. By varying lattice constant Ʌ and filling factor in the first ring d۱/Ʌ, we can easily control chromatic dispersion and achieve three optimal structures for the circular lattice of fibers #CF۱ (Ʌ = ۱.۰ µm, d۱/Ʌ = ۰.۶۵), #CF۲ (Ʌ = ۱.۰ µm, d۱/Ʌ = ۰.۷), and #CF۳ (Ʌ = ۲.۰ µm, d۱/Ʌ = ۰.۳) and two optimal structures for the hexagonal lattice of fibers #HF۱ (Ʌ = ۱.۰ µm, d۱/Ʌ = ۰.۵), #HF۲ (Ʌ = ۲.۰ µm, d۱/Ʌ = ۰.۳). At the same structural parameter (Ʌ = ۲.۰ µm, d۱/Ʌ = ۰.۳) and the corresponding pumping wavelength, the circular structure has a dispersion smaller by ۵.۵۹۸ ps/mn/km than the hexagonal lattice. #CF۱ has all-normal dispersion with the peak of the dispersion curve asymptote to the zero-dispersion curve which is very suitable for coherent supercontinuum generation (SCG). The #HF۱ structure has a near-zero flat anomalous dispersion in the wide wavelength range from ۱.۱ µm to ۱.۴ µm. Our results will be an important premise in choosing a PCF structure to study SCG.

کلیدواژه ها:

photonic crystal fibers ، Chloroform ، Dispersion Characteristic ، Circular lattice ، Hexagonal lattice