应用变分法,研究了微扰对类明孤子在光纤中非线性传输特性的影响,导出了类明孤子脉冲参量演化的动力学方程。它统一了在单模光纤、色散缓变光纤或色散控制光纤中类明孤子脉冲参量演化的动力学方程。在此基础上,计算了色散缓变光纤中的线性高阶色散微扰。结果表明

The influence of perturbation on the propagation properties of optical bright-soliton-like pulses is investigated in optical fibers by means of variational method, and the evolution equations for the parameters of the optical bright-soliton-like pulse is derived. These equations are the unity of the evolution equations for the parameters of the optical bright-soliton-like pulse among monomode optical fibers, the fiber with slowly decreasing dispersion or dispersion-managed optical fibers. By these equations, the perturbation of linear high-order dispersion in the fiber is calculated. The results show that linear high-order dispersion affects the position and the phase, doesn't affects the amplitude ,the width and the chirp of the bright-soliton-like pulse. The slowly decreasing dispersion affects all of the parameters of the optical bright-soliton-like pulse.