通过计算结构的有效折射率，证实了杂质带色散是正常色散。
After calculating the effective refractive index of the structure, we have verified that the impurity band has a normal dispersion.
建议利用三能级级联型介质实现从正常色散到反常色散的变换。
We suggest that a three-level cascade medium be used to achieve the switching from normal dispersion to anomalous dispersion.
提出一种在单模光纤正常色散区由连续波产生超短光脉冲串的新方法。
A new method for ultrashort optical pulse train generation from a cw signal in the normal dispersion regime of optical fibers is suggested.
由啁啾演变结果可得，在正常色散区可形成暗孤子，也可实现对皮秒脉冲压缩。
The results show that chirped pulses can be compressed and dark soliton can be formed.
本文提出了利用正常色散光纤加线性啁啾光纤光栅组成全光纤光脉冲压缩器方案。
An optical pulse compressor using a normal dispersion fiber combined with a linearly chirped fiber grating (instead of a block grating pair) is proposed.
通过改变耦合到探测跃迁的驱动场强度，可以实现从正常色散到反常色散的转换。
The switching from normal dispersion to anomalous dispersion is obtained by varying the intensity from couple to probe transition.
结果表明，对于每一种情形，在同一频率区域系统既能呈现正常色散，也能呈现反常色散。
It is shown that for each case, the medium exhibits either normal or anomalous dispersion at the same frequency regime.
结果表明，对于每一种情形，在同一频率区域系统既能呈现正常色散，也能呈现反常色散。
It is shown that for each case, the medium exhibits either normal or anomalous dispersion at the same frequency regime.
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