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

Authors

• Ban Tran Le Tran ¹
• Thuy Nguyen Thi ^{2, 3}
• Thuy Nguyen Thi ⁴
• Lanh Chu Van ¹

1. Department of Physics, Vinh University, Vinh, Vietnam
2. University of Education, Hue University
3. 34 Le Loi, Hue city, Viet nam
4. University of Education, Hue University, Hue, Vietnam

Abstract

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 d₁/Ʌ, we can easily control chromatic dispersion and achieve three optimal structures for the circular lattice of fibers #CF₁ (Ʌ = 1.0 µm, d₁/Ʌ = 0.65), #CF₂ (Ʌ = 1.0 µm, d₁/Ʌ = 0.7), and #CF₃ (Ʌ = 2.0 µm, d₁/Ʌ = 0.3) and two optimal structures for the hexagonal lattice of fibers #HF₁ (Ʌ = 1.0 µm, d₁/Ʌ = 0.5), #HF₂ (Ʌ = 2.0 µm, d₁/Ʌ = 0.3). At the same structural parameter (Ʌ = 2.0 µm, d₁/Ʌ = 0.3) and the corresponding pumping wavelength, the circular structure has a dispersion smaller by 5.598 ps/mn/km than the hexagonal lattice. #CF₁ 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 #HF₁ structure has a near-zero flat anomalous dispersion in the wide wavelength range from 1.1 µm to 1.4 µm. Our results will be an important premise in choosing a PCF structure to study SCG.

Keywords

• Photonic crystal fibers
• Chloroform
• Dispersion Characteristic
• Circular lattice
• Hexagonal lattice.