1. Erbium-doped superfluorescent fiber sources (SFS) pumped near 980nm in double-pass backward (DPB) configuration have been characterized through theoretical simulation.
   理论研究了双程后向结构掺铒光纤超荧光光源的特性。
2. Erbium ions concentration is obtained by the information of measured coefficients along with modeling of double-pass backward (DPB) superfluorescent fiber source (SFS).
   再利用这些系数和复行后向超萤光光纤光源的模拟，得到掺铒光纤的浓度。

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