温度对掺铒光纤光谱特性影响研究

不断提高以掺铒光纤为核心的光纤器件功率是研究与应用领域中的一个重要课题。高功率光纤器件内能量聚集会发热升温，造成器件光谱参数性能显著变化，进而造成以掺铒光纤为核心的光学器件的性能发生显著变化。因此对掺铒光纤在大温度范围下的光谱性能进行研究具有重要意义。利用斯塔克能级展宽理论建立了掺铒光纤吸收系数与温度的关系模型，在此基础上结合McCumber理论仿真计算了掺铒光纤荧光寿命与温度的关系。以OFS-MP980型掺铒光纤为实验对象，测量了掺铒光纤在常温至900 ℃范围内的吸收光谱、发射光谱。结果表明，温度升高造成980 nm波段吸收系数整体下降，且吸收系数的峰值波长增加，平均增加率0.625 nm/100 ℃。1 530 nm波段吸收系数整体展宽，且峰值吸收系数下降，平均下降率为-0.19 dB/100 ℃。600 ℃以内荧光寿命随温度呈近似线性下降，下降率为-0.23 ms/100 ℃。600 ℃以内理论模型能够反应温度造成峰值吸收系数、荧光寿命近似线性变化的趋势。

Temperature Effects on Erbium Doped Optical Fibers Properties

In scientific research and engineering application ,improving the power of fiber device is an important topic ,which leads to observably rise of temperature in fiber core at the same time .In this paper ,Thermal effect and its influence on absorp‐tion spectrum and lifetime of Erbium‐doped fiber are studied with numerical modeling .Lorentz broadening of sub‐levels is used to build the mathematical relationship between temperature and absorption spectrum .The McCumber Theory is applied to de‐duce the lifetime of Erbium‐doped fiber in different temperature .Temperature experiments of absorption and emission spectrum from 25 to 900 ℃ are carried out ,which show that the wavelength of absorption peak near 980nm increase at rate of 0.625 nm/100 ℃ ,the ratio of absorption peak near 1 530 nm declines at a rate of 0.001 9 dB · (m℃)-1 and the broadband of absorption spectrum near 1 530 nm increase with rising temperature .The linear variation of lifetime and peak absorption in experiment proves that the theoretical model is reasonable when the temperature is below 600 ℃ .