摘要
本文从理论上分析了具有自相位调制的光脉冲在色散介质中的传播特性,从而解释了超短光脉冲的压缩机理;并用严谨的数学步骤,将各种文献中形式各异的非线性薛定谔方程归结为统一的形式,避免了因符号定义不同而易于引起的混淆。针对该方程的特点.找到了合适的数值求解法,利用微机获得了在不同色散的介质中,光脉冲振幅、频谱、相位、啁啾等沿光纤方向变化的定量关系曲线。结果表明:在正色散介质中,脉宽及带宽均展宽,而在负色散介质中,脉冲沿传播方向越来越窄,表现为孤子效应。最后结合光栅对,给出了用光纤、光栅对获得1.06μm超短光脉冲时系统各部分的最佳参量。
The characteristics of ultrashort pulse which propagates in optical fiber with self -phase modulation have been analysied in this paper, the different NL Schodinger equations refering to different theses have also been united. Considering the special feature of the equation, we found the suitable numerical calculation, and got the relation curves of amplitude, frequence, phase and chirp along different dispersion optical fiber at different time by microcomputer. The results show: both pulse width and bandwidth are widened in positive dispersion medium, but pulse width is getting more and more narrow along propagating direction in negative dispersion medium, which is a typical soliton pulse. Combined with a pair of gratings, we gave the optimum parameters of fiber-gratings compression system for 1.06μm.
基金
中国科学院西安光机所所长基金
关键词
光纤
超短光脉冲
计算机
模拟
传播
Fiber
Ultrashort light pulse
Computer Simulation
