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首页> 外文期刊>Optical fiber technology >Influence of pump pulse spectrum on the signal-noise-ratio of brillouin scattering in brillouin optical time domain reflectometry
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Influence of pump pulse spectrum on the signal-noise-ratio of brillouin scattering in brillouin optical time domain reflectometry

机译：泵脉冲谱对布里渊光学时域反射中布里渊散射信噪比的影响

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摘要

The influence of pump pulse spectrum launched into the sensing fiber on the spontaneous Brillouin scattering and Brillouin Optical Time Domain Reflectometry (BOTDR) sensing system, is investigated both theoretically and experimentally. The pump pulse power spectrum is the essential factor for the Brillouin scattering from physical mechanism, and it includes two ingredients: the laser linewidth and the modulated pulse waveform; they both subsequently affect the performance of the BOTDR system. Two different pump pulse spectra are generated in the experiment: (1) the output light of a distributed feedback (DFB) laser with 3 MHz linewidth, modulated to a rectangular pulse; and (2) the continuous output of a fiber laser with 4 KHz linewidth, modulated to a Lorentzian pulse. Experimental results indicate that the signal-noise-ratio (SNR) of the Brillouin scattering spectrum for the second pulse spectrum is 4 dB larger than that of the first, then the corresponding frequency fluctuation of the whole sensing fiber in BOTDR for the second pulse spectrum is 2 MHz smaller than that of the first. This is in accordance with numerical simulations. This study will likely prove to be beneficial for the design optimization of BOTDR sensing systems.
机译：在理论上和实验上，在理论上和实验上调查了在自发布里渊散射和布里渊光学时域反射测量（BOTDR）传感系统上的传感光纤中发射到传感光纤中的影响。泵脉冲功率谱是从物理机制散射的布里渊散射的基本因素，它包括两种成分：激光线宽和调制脉冲波形;它们都会影响BOTDR系统的性能。在实验中产生两个不同的泵浦脉冲谱：（1）分布式反馈（DFB）激光器的输出光，3 MHz线宽，调制到矩形脉冲; （2）具有4 kHz线宽的光纤激光器的连续输出，调制到Lorentzian脉冲。实验结果表明，第二脉冲谱的布里渊散射光谱的信噪比（SNR）比第一脉冲的4dB大，然后在BOTDR中的整个传感光纤的相应频率波动进行第二脉冲谱比第一个小2 MHz。这符合数值模拟。本研究可能证明是有利于Botdr传感系统的设计优化。

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  • 来源
    《Optical fiber technology》 |2020年第3期|102143.1-102143.5|共5页
  • 作者

    Hao Yunqi; Zhai Fengxiao; Yang Kun; Liu Nannan; Liu Sujuan;

  • 作者单位

    Zhengzhou Univ Light Ind Coll Phys & Elect Engn Zhengzhou 450002 Henan Peoples R China;

    Zhengzhou Univ Light Ind Coll Phys & Elect Engn Zhengzhou 450002 Henan Peoples R China;

    Zhengzhou Univ Light Ind Coll Phys & Elect Engn Zhengzhou 450002 Henan Peoples R China;

    Zhengzhou Univ Light Ind Coll Phys & Elect Engn Zhengzhou 450002 Henan Peoples R China;

    Zhengzhou Univ Light Ind Coll Phys & Elect Engn Zhengzhou 450002 Henan Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pump pulse spectrum; Pulse shape; Linewidth of laser source; SNR; BOTDR sensing system;

    机译：泵脉冲谱;脉冲形状;激光源的线宽;SNR;Botdr感应系统;

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