| With the rise of big data and cloud computing,the amount of information has dramatically increased so that people have higher requirements for the ultra-high speed and ultra-large capacity optical fiber transmission.To expand the bandwidth that is not fully utilized in O,E,S band,the research of a novel fiber is very important.It can be used for ultra wideband fiber amplifier,ASE light sources and tunable fiber laser for communication network.So,finding a new materials with near infrared emission has become a hot topic in fiber optics.The recent reported bismuth/erbium codoped optical fiber have demonstrated a lot of advantages.It is expected to play an important role in ultra wideband fiber amplifier in the future.Due to the controversy about the radiation machanism of bismuth/erbium codoped optical fiber,in this thesis the luminescence characteristics and the radiation machanism have systematically been studied.The main work includes:1.Summary of the development and application of bismuth doped optical material,including the research status in 1000-1700nm and 400-700nm band,and the key problems of the development of bismuth doped optical fiber.2.The related theories of bismuth electron structure are summarized.The optical properties and the luminescence machanism are studied from the perspective of atomic structure.Through the analysis of the energy transition of atomic structure,the luminescence center and transition wavelength will be predicted.3.Fluorescence properties of bismuth/erbium co-doped optical fiber are investigated when pumped by 980nm and 830nm laser diodes.And the influence of pump power and wavelength,different doping fibers upon the fluorescence properties have systematically measured and analyzed.4.The effect of ? ray radiation upon the absorptiion and transition of Bi/Er co-doped optical fiber and Bi/Er/Yb co-doped optical fiber have further been studied.The results demonstrate that y radiation has great influence upon the formation of BAC. |
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