标题： 一维光散射中的瑞利衰落抑制 显示英文标题

标题： Rayleigh fading suppression in one-dimension optical scatters

摘要： 高相干波有利于需要相位恢复的应用，但高相干波在通过随机散射介质时容易遇到瑞利衰落现象。 作为一个典型例子，相敏光时域反射仪（\Phi -OTDR）利用光纤中后向散射光的相干干涉实现超灵敏声学传感，但发生衰落的传感位置将无法正常工作。 除了传感领域，衰落也普遍存在于光学成像和无线通信中，因此具有重要意义。 在本文中，我们理论描述并实验验证了如何通过任意数量的独立探测通道来抑制一维光学散射中的衰落现象。 我们最初理论解释了为什么衰落会导致\Phi -OTDR解调相位中的严重噪声；然后 研究了非相干散射光波的M阶求和，以消除衰落。 最后，检索相位信噪比的增益及其波动被分析推导并实验验证。 这项工作为一维光学散射中的衰落消除提供了指导，并为光学成像和无线通信提供了见解。 显示英文摘要

摘要： Highly coherent wave is favorable for applications in which phase retrieval is necessary, yet a high coherent wave is prone to encounter Rayleigh fading phenomenon as it passes through a medium of random scatters. As an exemplary case, phase-sensitive optical time-domain reflectometry (\Phi-OTDR) utilizes coherent interference of backscattering light along a fiber to achieve ultra-sensitive acoustic sensing, but sensing locations with fading won't be functional. Apart from the sensing domain, fading is also ubiquitous in optical imaging and wireless telecommunication, therefore it is of great interest. In this paper, we theoretically describe and experimentally verify how the fading phenomena in one-dimension optical scatters will be suppressed with arbitrary number of independent probing channels. We initially theoretically explained why fading would cause severe noise in the demodulated phase of \Phi-OTDR; then M-degree summation of incoherent scattered light-waves is studied for the purpose of eliminating fading. Finally, the gain of the retrieved phase signal-to-noise-ratio and its fluctuations were analytically derived and experimentally verified. This work provides a guideline for fading elimination in one-dimension optical scatters, and it also provides insight for optical imaging and wireless telecommunication.