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但是我用图中上面的公式，matlab算的kappa还是不对，。波导设置如下，
（弱波导，弱耦合）。
这边我不太理解，我在想会不会是从FDE中导出的数据归一化后的，导致matlab算的kappa不对和特别小呢？如果我想导出没有归一化后的数据该怎么做呢？
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