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Derivation of a reflectogram using digital lock-in detection in coherent FMCW reflectometry based on a uniformly pumped Brillouin grating

机译:基于均匀泵浦布里渊光栅的相干FMCW反射法中使用数字锁定检测的反射图推导

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We used digital lock-in detection to demodulate in-phase and quadrature components from a balanced mixer output in coherent FMCW reflectometry based on a uniformly pumped Brillouin grating. All the frequency components contributing to a reflectogram were extracted without attenuation by using a rectangular window in the frequency domain. We succeeded in reshaping a deformed reflectogram into a step-wise reflectogram for a single mode fiber that consisted of two fibers with different Brillouin frequencies. We found multiplicative noise to be dominant in the retrieved reflectograms, whose signal levels typically varied between +/- 7 and +/- 10%. We compared the observed changes with those estimated from power fluctuations in the amplified probe and pump light waves. (C) 2016 Elsevier Inc. All rights reserved.
机译:我们使用数字锁定检测,以基于均匀泵浦的布里渊光栅的相干FMCW反射法从平衡混频器输出中解调出同相和正交分量。通过在频域中使用矩形窗口,提取出所有有助于反射图的频率分量,而不会产生衰减。我们成功地将单模光纤的变形反射图重塑为逐步反射图,该单模光纤由两个具有不同布里渊频率的光纤组成。我们发现,在反射的反射图中,乘性噪声占主导地位,其信号电平通常在+/- 7和+/- 10%之间变化。我们将观察到的变化与根据放大后的探头和泵浦光波的功率波动估算的变化进行了比较。 (C)2016 Elsevier Inc.保留所有权利。

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