从脉冲在光纤中传输所满足的非线性薛定谔方程出发,以双曲渐减的正常色散渐减光纤(ND-DDF)获得线性啁啾自相似脉冲为基础,采用窗口为1550 nm的色散光纤构成 梳状色散光纤(CDPF),并给出了相应的理论模型。通过数值模拟的方法研究和分析了脉冲在接近于色散渐减光纤的色散变化趋势的梳状色散光纤中演化成 自相似脉冲及其自相似指数变化。结果表明,中心波长为1550 nm的双曲正割脉冲在不同初始能量和初始脉冲宽度的情况下,梳状色散光纤可以产生抛物线型 自相似脉冲且具有很好的线性啁啾特性。

Based on the nonlinear Schr?dinger equation, pulse propagation in fiber and the linearly chirped parabolic pulse generation by the dispersion decreasing fiber with a normal dispersion (ND-DDF) with a hyperbolic profile, a novel scheme for the generation of the self-similar parabolic pulse by use of a comb-like profiled fiber (CDPF) with normal group-velocity dispersion is proposed. The corresponding numerical model is also presented. In this model, evolution of the self-similar parabolic pulse in the CDPF close to dispersion profile of the DDF is analyzed numerically. The results show that when the hyperbolic-secant-like pulses at 1550 nm have different initial energy and pulse width, the pulse in the CDPF can evolve into a linearly chirped pulse with an exact parabolic intensity profile.