For example, for a homogeneous optical fiber the computed relative error of normalized cutoff frequency for all guide-mode are between 10 ~ (-3) and 10 ~ (-5).

例如，对均匀光纤，计算出的所有导模的归一化截止频率值的相对误差为10 ~ (- 3)10 ~ (- 5)。

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By fulfilling the experiment, some very good frequency spectrum images are obtained, and the system's relative error is below 0.08 %, so its function of locating and monitoring can be realized.

实验获得了清晰的频谱图像，系统定位的相对误差小于0.08%，可实现定位监测功能。

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The test results prove that by using the system the frequency measurement accuracy can achieve thousandth and the relative error of measurement within 1%.

测试结果证明采用该系统对频率测量的精度可以达到千分之一，测量的相 对误差不大于1％。

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