色散平坦渐减光纤中自相似脉冲演化特性研究

Evolution characteristic study of self-similar pulse generation in dispersion flattened/decreasing fiber

从脉冲在光纤中传输所满足的非线性薛定谔方程出发,采用分布傅里叶方法对脉冲在色散平坦渐减光纤中自相似脉冲演化特性进行了研究。结果表明:双曲正割脉冲在不同初始能量和初始脉冲宽度的情况下,色散平坦渐减光纤可以产生带有线性啁啾的自相似脉冲。进一步研究表明,随着初始啁啾增加,脉冲逐渐展宽且展宽速度逐渐加快,而演化特性的劣化程度随啁啾参量的增加而增大;当初始啁啾为正时自相似脉冲演化特性劣于负啁啾时的特性。

Based on the nonlinear Schrdinger equation desiring pulse propagation in fiber,the evolution characteristic study of self-similar pulse generation in dispersion flattened/decreasing fiber has been investigated by the method of Split-step Fourier.The results show that when the hyperbolic-secant-like pulses has the different initial energy and pulse width,the pulse in the DFDDF can evolve into a linearly chirped pulse with an exact parabolic intensity profile.It is further investigated that the pulse width is broadened with the increase of initial chirp parameter.The characteristics of the self-similar parabolic pulse for negative chirp are worse than those for positive chirp.