脉冲光的光纤布里渊散射谱拟合研究  

Optical Fiber Brillouin Scattering Spectrum Fitting of Pulsed Light

作　　者：杨志[1,2] 王震 李永倩[1,2] 吕安强[1,2] Yang Zhi;Wang Zhen;Li Yongqian;LüAnqiang(Department of Electronic and Communication Engineering,North China Electric Power University,Baoding 071003,Hebei,China;Hebei Key Laboratory of Power Internet of Things Technology,North China Electric Power University,Baoding 071003,Hebei,China)

机构地区：[1]华北电力大学电子与通信工程系,河北保定071003 [2]华北电力大学河北省电力物联网技术重点实验室,河北保定071003

出　　处：《中国激光》2023年第19期106-113,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(52177141)。

摘　　要：针对脉冲光布里渊散射谱在用传统的洛伦兹曲线拟合时存在较大拟合误差的问题,通过理论分析推导出了脉冲光的光纤布里渊散射谱函数表达式。采用布里渊光时域反射(BOTDR)系统对一段3000 m长光纤的布里渊散射谱进行测量,对测得的不同脉冲宽度下的光纤布里渊散射谱分别采用洛伦兹函数和本文推导的函数进行拟合。结果表明:随着入射脉冲光的脉冲宽度变窄,采用推导的光纤布里渊散射谱函数能够有效提高BOTDR系统布里渊散射谱的拟合精度。Objective Optical fiber sensing is an essential aspect of sensing technology.An optical fiber can be used as a medium through corresponding technical approaches to detect changes in the wavelength and frequency of optical signals,indirectly monitoring changes in the external environment.Because of its significant anti-electromagnetic interference ability,optical fiber sensing technology can work satisfactorily in strong magnetic environments,and it exhibits high-temperature resistance and good corrosion resistance in diverse areas such as aerospace,medical testing,civil engineering,power monitoring,and military applications.This method has received increasing attention and applications.Distributed fiber-optic sensing utilizes the nonlinear scattering properties of light as it travels through the fiber to monitor changes in the external environment,such as the temperature and pressure along the fiber.The Brillouin optical time-domain reflectometer can detect changes in the external environment by measuring the shift in the center frequency of the spontaneous Brillouin scattering spectrum of the pulsed light in the fiber.Brillouin-distributed fiber-optic sensing enables long-distance temperature and stress measurements.This technology has higher measurement accuracy and spatial resolution,and it can be applied to longer measurement distances than other sensing technologies.This technology plays a critical role in various industrial applications.Currently,extraction of the center frequency of the Brillouin scattering spectrum is typically performed according to the Lorentzian function.The frequency-sampled values of the Brillouin scattering spectra were measured using equally spaced frequency sweeps and fitted using a Lorentzian function.The frequency value corresponding to the center point of the Lorentz curve obtained by fitting is the center frequency of the Brillouin scattering spectrum,and the Brillouin frequency shift is obtained by subtracting the value from the frequency of the light source.The Brillouin sca

关 键 词：光纤光学 布里渊散射 布里渊频移 洛伦兹函数 数据拟合 

分 类 号：TN247[电子电信—物理电子学]