Preparation of ytterbium-doped photonic crystal fiber core material and numerical simulation of optical fiber

The ytterbium-doped multicomponent glass photonic crystal fiber has relatively high ion doping concentration, large stimulated emission cross-sectionand broad emission bandwidth. Meanwhile, it allows high pump power density and operating temperature, thus it is very suitable to be used in the development of high power fiber lasers. Using high-temperature melting-quenching method, a new ytterbium-doped photonic crystal-fiber glass material was developed and its physical and spectral characteristics were measured. Test results demonstrate that the newly developed material has large simulated emission cross-section and long fluorescent lifetime. Based on the new material, ahexagon- shaped ytterbium-doped photonic crystal fiber was designed and its physical structure was simulated utilizing finite element simulator (FEM). Both measurement and simulation results prove that the new material developed can be used as the core material of photonic crystal fiber.