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在已有光纤光栅调谐技术的基础上，研究了一种由不同光谱特性的光纤光栅组成的光栅对，用于测量光纤光栅谱线结构。并给出了测试结果。
Based on the tuning technology of FBG, a grating pair composed of FBG with different spectral characteristics is studied, which is used to measure the spectral line structure of FBG. And gives the test results.