Mode locking can be induced not only by loss modulation, but also by phase modulation.
锁模不仅可用损耗调制取得, 也可用位相调制来得到.
Similar to the case of cubic nonlinear refractive index, the loss will make the width of the power gain spectra of modulation instability become narrower and the peak gain smaller.
和只有三阶非线性的情况类似,损耗也会使不稳定增益谱的谱宽变窄,谱峰减小;
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