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采用分步傅里叶算法数值求解非线性薛定谔方程,分析了单模光纤中不同情形下皮秒量级啁啾脉冲的分裂机制。结果表明,对于较短的脉冲(10 ps),啁啾脉冲分裂从高阶孤子压缩导致的脉冲塌陷开始;对于较长的脉冲(200 ps),脉冲分裂主要由调制不稳定性导致;对于介于两者之间的脉冲(50 ps),噪声使得脉冲分裂机制从高阶孤子压缩转向调制不稳定性。初始正、负啁啾能分别加速和延缓短脉冲分裂,而初始啁啾对长脉冲分裂影响很小。初始啁啾对脉冲分裂的影响与其分裂机制密切相关。
The nonlinear Schrodinger equation was solved numerically by the fractional Fourier algorithm and the splitting mechanism of the picosecond chirped pulse under different conditions in single mode fiber was analyzed. The results show that for short pulses (10 ps), chirp splitting starts with pulse collapse caused by higher-order soliton compression; for longer pulses (200 ps), the pulse splitting is mainly caused by modulation instability; for the medium Between the two pulses (50 ps), the noise causes the pulsed splitting mechanism to shift from higher-order soliton compression to modulation instability. The initial positive and negative chirp can accelerate and delay the short-pulse splitting respectively, while the initial chirp has little effect on long-pulse splitting. The effect of initial chirp on pulsed fission is closely related to its fission mechanism.