Dispersion Optimization in GeO2-doped Silica Photonic Crystal Fibers with Circular Lattice

Authors

• Thuy Nguyen Thi ^{1, 2}

1. University of Education, Hue University
2. 34 Le Loi, Hue city, Viet nam

Abstract

In this paper, we analyze the dispersion properties of photonic crystal fiber with the core replaced by a composite of 85% SiO₂-15% GeO₂. The air hole’s radii of the layers in the cladding are designed differently to improve the dispersion and nonlinear properties of the fibers. Both anomalous and all-normal dispersions have been optimized. Based on numerical simulation results, two optimal structures (d₁/Ʌ = 0.4, Ʌ = 0.9 µm and d₁/Ʌ = 0.45 and Ʌ = 1.0 µm) are proposed with a very small dispersion value of 0.298 ps/ nm.km and −0.311 ps/nm.km at the pump wavelength of 1.53 µm and 0.985 µm, respectively. The high nonlinear coefficient, small effective mode area, and very low attenuation of about 10⁻⁷ dB/m at the pump wavelength are also favorable conditions for the application of broad-spectrum supercontinuum with low peak power. The proposed fibers can be new supercontinuum sources that effectively replace glass core fibers.

Keywords

• Photonic crystal fibers
• composite SiO2-GeO2
• flat dispersion
• small effective mode area
• low attenuation.