为了突破以往研究的波形局限, 探究任意波形脉冲泵浦下掺铒光纤的自发辐射特性, 从速率方程组出发, 采用分时段计算的方法得到各能级粒子数及自发辐射平均功率的表达式.仿真和实验表明, 泵浦光毛刺对自发辐射光的影响较小, 具有类似“高频滤波”的特性;泵浦功率较大时自发辐射光的波形与泵浦波形接近, 该研究结果可以用于光纤激光器的全光调制.理论分析与实验结果相符合, 证明了理论的可靠性.

In order to study the active spontaneous emission of erbium-doped fiber pumped by arbitrary waveform pulse with breaking the limitation of pump waveform before. By dividing the time into tiny periods, the expressions for level population and the average power of active spontaneous emission were obtained with rate equations. Simulations and experiments show that pump glitches have less effect on the active spontaneous emission just like having a “high frequency filter”;the waveforms of the pump light and active spontaneous emission light are alike when the pump power is large relatively, this research can be used to all-optical modulation for the optical fiber laser. The results are consistent with the theoretical analysis, which show the analysis is reliable.