While the pulse propagates in the fiber, it becomes asymmetrical and the asymmetrical SC spectrum is resulted eventually because the dispersion slope of the dispersion-decreasing fiber is not zero.

• 由于色散渐减光纤的色散斜率不为零,因此脉冲在光纤中传输时产生不对称的情形,并最终产生不对称的光纤超连续谱。