光纤中的SBS反射率和波形研究

Investigation on SBS reflectivity and waveform in fiber

从理论和实验上研究了不同焦距下泵浦能量以及透镜与光纤间距对多模光纤中的SBS能量反射率和脉冲波形的影响。理论模拟采用一维瞬态SBS数值计算模型和边界噪声输入法 ,得到了SBS反射率和脉冲上升沿的变化规律。实验上采用 1.0 6μm的YAG激光器和无掺杂多模阶跃石英光纤 ,测得了能量反射率和波形的变化规律 ,获得的最大反射率为 69% ,脉宽压缩比为 3 :1-2 :1。计算结果与实验结果符合较好。

The influences of pump energy,focal length and distance between fiber and lens on SBS reflectivity and waveform in multimode fiber are investigated theoretically and experimentally.In theoretical simulation,one-dimensional transient numerical calculation model of SBS and method of boundary noise import are adopted,and the changing regularities of SBS reflectivity and leading edge of pulse are achieved.YAG laser with 1.06μm wavelength and undoped multimode step quartz fiber are used in experiment,and the changing regularities of energy reflectivity and waveform are gained.The maximum of reflectivity achieved was 69%,and the pulse compression ratio was 3:1-2:1.The theoretical simulation and the experiment agree well.