Effect of pump-read optical path difference on the measurement of Brillouin dynamic grating spectra localized by the correlation domain technique with a single laser setup
Effect of pump-read optical path difference on the measurement of Brillouin dynamic grating spectra localized by the correlation domain technique with a single laser setup
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DOI：
10.1117/12.2059518
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
R. K. Yamashita;M. Kishi;K. Hotate
中科院分区：
文献类型：
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作者：
R. K. Yamashita;M. Kishi;K. Hotate
在保偏光纤中布里渊动态光栅的相关域分布测量中，需要对泵浦光和读取光之间的调频相位进行调整。我们通过实验评估了相位差对测量的影响。单激光装置可以获得稳定性较高的BDG光谱，但调频相位关系是固定的。因此，由于光纤的双折射特性，不能保证被测光纤所有点的调频同步。在本报告中，我们改变了泵浦和读取光波之间的光程差，显示了光谱退化。
In correlation domain distributed measurement of Brillouin dynamic grating (BDG) in polarization maintaining fiber, adjustment of the frequency modulation (FM) phase between the pump and read lightwaves is essential. We experimentally evaluated the phase difference impact on the measurement. A single laser setup can acquire the BDG spectra with higher stability, but the FM phase relation is fixed. Therefore the FM synchronization is not guaranteed for all points of the fiber under test due to the birefringence of the fiber. In this report, we varied the optical path difference between the pump and the read lightwaves, showing the spectrum degradation.