Study On Effect Of Temperature On Fluorescence Characteristics Of Bismuth-erbium Co-doped Fiber

With the rapid development of fiber fabrication technology,low loss fibers can be fabricated in the 1000-1700 nm band.And with the dramatic increase requirements in communication bandwidth,erbium-doped fiber amplifiers that can only be used in the C+L band have been unable to meet people's demand.Therefore,the development of an ultra-wideband fiber amplifiers and lasers covering the low loss communication window has become an urgent need.Bismuth/Erbium co-doped fiber(BEDF)can produce ultra-wideband fluorescence of 900-1550 nm,and it is expected to be a new type of broadband optical amplifier and laser covering the low loss window.But now the near-infrared luminescence mechanism of Bismuth-doped fiber is still controversial.This thesis systematically studies the broadband fluorescence characteristics of Bismuth/Erbium co-doped fiber under temperature change conditions and analyzes its luminescence mechanism.The main works include:1.The characteristics of Er3+ and different valence ions of Bi,the different Bismuth-related active centers in different substrates are summarized.The effects of high temperature and low temperature on the absorption and luminescence spectra of Bismuth doped fiber are studied.2.A BEDF is pumped by 830 nm laser to study the near infrared fluorescence characteristics under high temperature,low temperature and room temperature.The experiments show that BAC-Ge concentration increases and peak power at 930nm increases under high temperature conditions.At low temperature,new BAC-Al was formed in BEDF.At room temperature,the flatness of fluorescence spectrum increases and the intensity decreases.3.By pumping the same BEDF with 980nm laser,the near infrared fluorescence characteristics under high temperature,low temperature and room temperature are investigated.BAC-Si can't be produced at high temperature and room temperature,but its concentration increases at low temperature,resulting in high flatness of 1400nm fluorescence.In addition,the fluorescence characteristics of BEDF are detected and compared with that in the heating process.The difference in fluorescence characteristics between Erbium-doped fiber and BEDF under the same experimental conditions was investigated.