中文摘要：

测试了Bi2O3-B2O3-SiO2玻璃中的Er^3＋离子的吸收光谱、发射光谱、4^I13/2的荧光寿命、拉曼光谱，及OH^-的傅里叶红外吸收光谱。应用Judd-Ofelt理论计算了该玻璃中的Er^3＋离子的J-O参数、振子强度、4^I13/2能级的寿命，从而利用测得的4^I13/2以的荧光寿命得出了4^I13/2能级的量子效率（15％）。由于较低量子效率可能与OH^-有关，所以计算了玻璃中的OH6-浓度，发现其浓度较高（1．66×10^19cm^-1，相当于Er^3＋浓度的3倍）。应用McCumber理论和四能级模型计算了Er^3＋离子的受激发射截面和荧光发射光谱的半峰全宽，结果与通过吸收光谱计算所得基本吻合。根据透射率和折射率的关系计算了折射率，发现和测量值相差很大，说明有较大的散射，通过拉曼光谱和显微镜测试，认为是玻璃中的微小气泡造成的。

英文摘要：

Erbium-doped fiber amplifiers （EDFAs） with wide and flat gain spectra in telecommunication windows are the key issues for dense wavelength division multiplexing （DWDM） optical network systems. However, the traditional commercialized EDFAs are made of SiO2-based material in which Er^3＋ ions show a narrow emission bandwidth for the 4^I13/2→4^I15/2 transition. Many methods have been investigated to broaden and flatten the gain spectra of the traditional EDFAs in order to meet the capacity demand. Recently, tellurite glasses have received considerable attention in EDFAs for the broad bandwidth of over 70 nm, which meets the transmission capacity of DWDM systems. Nevertheless, the bad thermal stability and the high up-conversion become the unsolvable obstacle. Compared to tellurite, borate is a betfer glass-former compound and has higher stability, larger phonon energy and broad bandwidth. We prepared Er^3＋ doped Bi2O3-B2O3-SiO2 Bi2O3,20% B2O3,40% SiO2,and 3.0% Er2O3 is added to dope the glasses. The absorption spectra for Er^3＋ and OH^- group, emission spectra and luminous decay for the transition 4^I13/2→4^I15/2 were measured. According to the standard J-O procedure the intensity parameters for the Er^3＋ in the prepared glass were obtained. The concentration of OH- group and inner quantum efficiency for 4^I13/2 level were estimated. It is validated that the lower quantum efficiency is caused by the higher content of OH^- group, about 3 times of Er^3＋ content. On the base of McCumber theory, the stimulated emission cross section for the 4^I13/2 level was derived and found to be in better agreement with the results calculated by using the emission spectra. We draw a conclusion that it is essential for the borate used in EDFAs to decrease the higher content of OH^- group despite of higher stability, larger phonon energy and broad bandwidth.