在光纤纤芯中掺入适量GeO2有利于增加纤芯非线性折射率, 提高光纤的非线性系数。利用有限元法设计了一种带宽为1.45 μm的宽反常色散掺杂光子晶体光纤, 其光纤可以利用低泵浦功率产生任意波长的光孤子。分析结果显示, 当脉冲脉宽TFWHM取300 fs时, 产生基阶光孤子需要的最高平均泵浦功率为0.001 695 W, 而产生五阶光孤子需要的最高平均泵浦功率仅0.042 38 W。

The nonlinear refractive index and nonlinear coefficient of the fiber can be enhanced by doping GeO2 into the fiber core. A special photonic crystal fiber for generating optical solitons is designed via the finite element method. Its bandwidth is 1.45 μm around the anomalous dispersion regime. The optical solitons with any wavelength can be generated easily in this fiber at low pump power. The numerical results show that the highest average pump power used to obtain the fundamental soliton is 0.001 695 W when the pump pulse width TFWHM is 300 fs, and it is only 0.042 38 W used to obtain the fifth-order solitons.