The digital coherent detection technique has been investigated without any frequency-scanning device in the Brillouin optical time domain reflectometry （BOTDR）, where the simplex pulse codes are applied in the sensi...The digital coherent detection technique has been investigated without any frequency-scanning device in the Brillouin optical time domain reflectometry （BOTDR）, where the simplex pulse codes are applied in the sensing system. The time domain signal of every code sequence is collected by the data acquisition card （DAQ）. A shift-averaging technique is applied in the frequency domain for the reason that the local oscillator （LO） in the coherent detection is fix-frequency deviated from the primary source. With the 31-bit simplex code, the signal-to-noise ratio （SNR） has 3.5-dB enhancement with the same single pulse traces, accordant with the theoretical analysis. The frequency fluctuation for simplex codes is 14.01 MHz less than that for a single pulse as to 4-m spatial resolution. The results are believed to be beneficial for the BOTDR performance improvement.展开更多
光纤通信网络作为现代信息传输的重要基础设施,其稳定性和可靠性直接关系到网络的整体性能。光缆终端盒作为光纤网络的关键节点,故障不仅会导致通信中断,而且可能引发严重的经济损失。通过研究光缆终端盒的常见故障类型和成因,探讨多种...光纤通信网络作为现代信息传输的重要基础设施,其稳定性和可靠性直接关系到网络的整体性能。光缆终端盒作为光纤网络的关键节点,故障不仅会导致通信中断,而且可能引发严重的经济损失。通过研究光缆终端盒的常见故障类型和成因,探讨多种故障诊断技术,包括光时域反射仪(Optical Time Domain Reflectometer,OTDR)、光功率监测技术以及可视化光缆测试仪,以提升故障诊断准确性和效率。展开更多
随着电力通信网络的不断发展,光缆作为传输介质的可靠性受到极大关注。光缆故障不仅会影响通信的稳定性,还会给电力系统的正常运行带来不利影响。因此,快速且准确地定位光缆故障点,并及时处理,已成为电力通信网络管理的重要任务。光时...随着电力通信网络的不断发展,光缆作为传输介质的可靠性受到极大关注。光缆故障不仅会影响通信的稳定性,还会给电力系统的正常运行带来不利影响。因此,快速且准确地定位光缆故障点,并及时处理,已成为电力通信网络管理的重要任务。光时域反射仪(Optical Time Domain Reflectometer,OTDR)曲线事件分析技术是光缆故障定位的核心技术。文章通过分析OTDR曲线事件分析技术,研究改进OTDR曲线事件分析技术,结合地理信息系统(Geographic Information System,GIS)技术设计电力通信光缆故障精确定位方案,并针对不同故障提出相应的处置对策。本研究旨在为电力通信网络中的光缆故障检测与定位提供技术支持,同时为提升电力通信网络的稳定性和可靠性提供理论依据。展开更多
基金supported by the National High Technology Research and Development Program of China(Grant No.2012AA041203)the National Natural Science Foundation of China(Grant Nos.61377062 and 31201377)+1 种基金the Program of Shanghai Excellent Technical Leaders,China(Grant No.13XD1425400)the Doctorial Fund of Zhengzhou University of Light Industry,China(Grant No.2013BSJJ012)
文摘The digital coherent detection technique has been investigated without any frequency-scanning device in the Brillouin optical time domain reflectometry （BOTDR）, where the simplex pulse codes are applied in the sensing system. The time domain signal of every code sequence is collected by the data acquisition card （DAQ）. A shift-averaging technique is applied in the frequency domain for the reason that the local oscillator （LO） in the coherent detection is fix-frequency deviated from the primary source. With the 31-bit simplex code, the signal-to-noise ratio （SNR） has 3.5-dB enhancement with the same single pulse traces, accordant with the theoretical analysis. The frequency fluctuation for simplex codes is 14.01 MHz less than that for a single pulse as to 4-m spatial resolution. The results are believed to be beneficial for the BOTDR performance improvement.
文摘光纤通信网络作为现代信息传输的重要基础设施,其稳定性和可靠性直接关系到网络的整体性能。光缆终端盒作为光纤网络的关键节点,故障不仅会导致通信中断,而且可能引发严重的经济损失。通过研究光缆终端盒的常见故障类型和成因,探讨多种故障诊断技术,包括光时域反射仪(Optical Time Domain Reflectometer,OTDR)、光功率监测技术以及可视化光缆测试仪,以提升故障诊断准确性和效率。
文摘随着电力通信网络的不断发展,光缆作为传输介质的可靠性受到极大关注。光缆故障不仅会影响通信的稳定性,还会给电力系统的正常运行带来不利影响。因此,快速且准确地定位光缆故障点,并及时处理,已成为电力通信网络管理的重要任务。光时域反射仪(Optical Time Domain Reflectometer,OTDR)曲线事件分析技术是光缆故障定位的核心技术。文章通过分析OTDR曲线事件分析技术,研究改进OTDR曲线事件分析技术,结合地理信息系统(Geographic Information System,GIS)技术设计电力通信光缆故障精确定位方案,并针对不同故障提出相应的处置对策。本研究旨在为电力通信网络中的光缆故障检测与定位提供技术支持,同时为提升电力通信网络的稳定性和可靠性提供理论依据。
