极化分集互补码增强相干OTDR系统性能
Enhancing performance of coherent OTDR systems with polarization diversity complementary codes
摘要：
监测光纤中的光学相位变化能够实现广泛的应用，其中通常由声学信号或振动引起快速相位变化。然而，估计的光纤响应的质量强烈地依赖于用于调制发送到光纤的光并捕获光场的变化的方法。在本文中，我们表明，分布式光纤传感系统可以有利地利用电信领域的技术，如在相干光传输中使用的那些，以提高其性能，在检测机械事件，同时共同提供一个简单的设置比广泛的脉冲克隆或基于频谱扫描的计划与声光调制器。我们定期捕获的整体光纤琼斯矩阵估计感谢一种新的探测技术，使用两个相互正交的互补（Golay）对二进制序列同时适用于相位和正交的两个正交偏振态。在文中详细介绍的条件下，实现了传感器阵列的理想信道响应估计，从而提高了相干相位OTDR系统的灵敏度和带宽。高灵敏度，线性响应，和带宽覆盖高达18 kHz的10个光纤布拉格光栅（FBG）组成的传感器阵列证明。
英文摘要：
Monitoring the optical phase change in a fiber enables a wide range of applications where fast phase variations are induced by acoustic signals or vibrations in general. However, the quality of the estimated fiber response strongly depends on the method used to modulate the light sent to the fiber and capture the variations of the optical field. In this paper, we show that distributed optical fiber sensing systems can advantageously exploit techniques from the telecommunication domain, as those used in coherent optical transmission, to enhance their performance in detecting mechanical events, while jointly offering a simpler setup than widespread pulse-cloning or spectral-sweep based schemes with acousto-optic modulators. We periodically capture an overall fiber Jones matrix estimate thanks to a novel probing technique using two mutually orthogonal complementary (Golay) pairs of binary sequences applied simultaneously in phase and quadrature on two orthogonal polarization states. A perfect channel response estimation of the sensor array is achieved, subject to conditions detailed in the paper, thus enhancing the sensitivity and bandwidth of coherent phase-OTDR systems. High sensitivity, linear response, and bandwidth coverage up to 18 kHz are demonstrated with a sensor array composed of 10 fiber Bragg gratings (FBGs).
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