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在DAS中的布里卢因散射诱导噪声:一个案例研究

Boris G Gorshkov^1,2, Denis E Simikin^2,3, Alexey E Alekseev³

¹Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov Street 38, 119991 Moscow, Russia.

Sensors (Basel, Switzerland)

|July 8, 2023

概括

自发的Brillouin散射 (SpBS) 在分布式声学传感 (DAS) 中显著增加噪声. 拒绝SpBS波,特别是使用宽带光学探测器,可以有效地减少这种占主导地位的噪声源.

科学领域:

光学和光子学在光学和光子学.
传感技术传感技术

背景情况:

自发的Brillouin散射 (SpBS) 是光纤的内在现象.
在分布式声学传感 (DAS) 系统中,SpBS有助于噪声.
了解SpBS噪声对于提高DAS性能至关重要.

研究的目的:

分析自发的布里卢恩散射 (SpBS) 作为分布式声学传感器 (DAS) 中的噪声源.
量化由SpBS引起的噪声功率.
调查用于减轻DAS中的SpBS噪声的方法.

主要方法:

对SpBS强度波动的实验分析.
确定SpBS斯托克斯波强度的概率密度函数 (PDF).
与雷利背散相对的SpBS噪声功率的估计.
对不同的光谱配置进行噪声组成分析.
实施一个不对称的马赫-泽恩德干扰仪 (MZI) 用于SpBS排斥.

主要成果:

在DAS中,SpBS强度波动增加了噪声功率.
频谱选择的SpBS Stokes波强度的PDF遵循一个负指数分布.
斯普斯噪声功率大约比雷利反向散射功率低18dB.
在分析的DAS配置中,SpBS噪声被确定为主要的噪声源,超过了热,射击和相位噪声.
在光探测器输入处拒绝SpBS波可以降低噪声功率.

结论:

自发的Brillouin散射在DAS中是一个重要的噪声贡献者.
拒绝SpBS波,特别是用于短脉冲的宽带光探测器,是减少噪声的有效策略.
使用不对称的马赫-泽恩德干扰仪证明了用于减轻SpBS噪声的实用方法.

关键词:

分布式声学传感 (DAS) 系统光纤传感器光纤传感器阶段敏感的光学时间域反射仪 (阶段-OTDR)自发的Brillouin散射 (SpBS) 是一种刺激的Brillouin散射 (SBS) 进行.

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