匹配干涉型光纤水听器中的动态不连续性瑞利散射噪声研究  

Dynamic and Discontinuous Rayleigh Scattering Noise in Path-Matching Interferometric Fiber-Optic Hydrophones

作　　者：戚悦 尚凡 马丽娜[1] 熊水东[1] Qi Yue;Shang Fan;Ma Lina;Xiong Shuidong(College of Meteorology and Oceanography,National University of Defense Technology,Changsha 410073,Hunan,China)

机构地区：[1]国防科技大学气象海洋学院,湖南长沙410073

出　　处：《光学学报》2022年第23期32-43,共12页Acta Optica Sinica

基　　金：国家自然科学基金(61901488)。

摘　　要：构建了短程传输链路的瑞利寄生干涉模型,利用干涉可见度的参数特性,得出系统背向瑞利散射噪声与询问脉冲宽度、传输链路光纤长度、瑞利散射率等参数的关系。理论与实验结果均表明:短程传输状态下瑞利散射并不会随着传输光纤长度的增加和瑞利散射率的提高而线性增强,而是呈现出不连续特征。短程传输状态下的瑞利散射还与问询系统的调制解调参数密切相关,随着调制解调参数的变化而动态变化。该研究结果定量揭示了短程传输链路状态下光纤水听器阵列的性能随瑞利散射的恶化情况,为短程传输状态下的系统优化设计提供关键支撑。In this paper,a spurious interference model of Rayleigh scattering for short-range transmission link is constructed,and the relationship between Rayleigh backscattering noise of the system and parameters such as interrogation pulse width,fiber length of transmission link,and Rayleigh scattering rate is summarized by using the parameter characteristics of interference visibility.Both theoretical and experimental results show that the effect of Rayleigh scattering under the short-range transmission does not increase linearly as the fiber length of the transmission link or Rayleigh scattering rate increases.Instead,it tends to be discontinuous.The Rayleigh scattering under the short-range transmission is also closely related to the modulation and demodulation parameters of the interrogation system and changes dynamically as these parameters vary.The research results quantitatively reveal the degradation of fiber-optic hydrophone array with Rayleigh scattering under short-range transmission links and provide significant support for the optimal design of the system under short-range transmission.

关 键 词：光纤光学 光纤传感 瑞利散射噪声 光纤水听器 短程传输 

分 类 号：O436.1[机械工程—光学工程]