Tran Tran Bao Le - Department of Physics, Vinh University, Vinh, Vietnam
Oanh Truong Thi Chuyen - Nguyen Quang Dieu High School for the Gifted, Cao Lanh, Vietnam
Thuy Nguyen Thi - University of Education, Hue University, Hue, Vietnam
Lanh Chu Van - Department of Physics, Vinh University, Vinh, Vietnam

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.

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