结果表明，当光栅对刻线失配时，且只考虑二阶色散的影响时，初始啁啾导致脉冲宽度小于无初始啁啾脉冲的宽度。
The simulations show that when the grating grooves are unparallel, the original chirp leads to the pulse width smaller only considering GDD.
当二阶和四阶色散分别为正和负时，无调制不稳定性；
When the second-order and fourth-order dispersions are respectively positive and negative, no modulation instability occurs.
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