论文部分内容阅读
针对多芯光纤完善了描述抽运光、信号光和Stokes信号的速率方程组.考虑了温差对受激布里渊散射的影响,利用有限元法求解温度分布方程组,分析了前向和后向抽运方式、对流系数、Stokes初始功率、光纤掺杂粒子密度和光纤长度对受激布里渊散射增益的影响.研究表明:后向抽运方式在抑制受激布里渊散射方面具有明显优势;减小对流系数有助于抑制受激布里渊散射;提高光纤掺杂密度能够加强抑制受激布里渊散射,同时也有助于提高光纤放大器的斜率效率.比较了在相同最佳光纤长度条件下,单芯和19芯光纤放大器的最高工作温度和受激布里渊散射增益.在受激布里渊散射增益小于阈值的前提下,19芯光纤放大器比单芯光纤放大器具有较低的最高工作温度,为进一步提升输出功率提供了更大空间.
The velocity equations describing pumping light, signal light and Stokes signal are improved for multi-core optical fiber. Considering the effect of temperature difference on stimulated Brillouin scattering, the temperature distribution equations are solved by finite element method, The effects of pumping mode, convection coefficient, initial Stokes power, fiber doping particle density and fiber length on the gain of Stimulated Brillouin scattering were studied. The results show that the backward pumped mode has obvious effect in suppressing stimulated Brillouin scattering The reduction of the convection coefficient helps to suppress the stimulated Brillouin scattering.Improving the fiber doping density can enhance the suppression of stimulated Brillouin scattering and also help to improve the slope efficiency of the fiber amplifier.Compared with the same optimal fiber The maximum operating temperature and the stimulated Brillouin scattering gain for single-core and 19-core fiber amplifiers over a length of 19-core fiber amplifiers are lower than for single-core fiber amplifiers, with stimulated Brillouin scattering gain less than the threshold The maximum operating temperature, to further enhance the output power to provide more room.