海缆是海缆基础设施供电和通信的关键载体,海缆监测对于保障海缆基础设施安全稳定运行具有重要工程意义。针对海缆扰动监测需求开展海缆扰动探测试验研究。首先,搭建基于分布式光纤传感技术的海缆扰动探测试验系统,并接入南海深海海底...海缆是海缆基础设施供电和通信的关键载体,海缆监测对于保障海缆基础设施安全稳定运行具有重要工程意义。针对海缆扰动监测需求开展海缆扰动探测试验研究。首先,搭建基于分布式光纤传感技术的海缆扰动探测试验系统,并接入南海深海海底观测网试验系统海缆暗光纤进行扰动探测试验,试验结果表明本系统能够有效探测铁锹拍击、车辆振动、海水冲刷及台风影响引起的海缆扰动。然后,根据海缆光纤瑞利背向散射(Rayleigh Backscattering,RBS)幅度信号特征,提出一种基于双向长短期记忆(Bidirectional Long Short-Term Memory,BiLSTM)神经网络的海缆扰动定位方法,本方法以海缆光纤RBS幅度信号的谱熵和瞬时频率作为特征参量输入,使用海缆光纤RBS幅度信号样本对本方法进行测试,结果表明本方法对海缆沿线扰动信号和非扰动信号的平均检测准确率高于99.6%。将海缆扰动探测试验系统与海缆扰动定位方法结合应用于海缆监测可有效探测海缆沿线扰动。展开更多
We propose a novel scheme to generate the ultra-wideband (UWB) doublet signal pulse based on the cross-gain modulation (XGM) in a semiconductor optical amplifier (SOA). In the scheme, only an optical source and an SOA...We propose a novel scheme to generate the ultra-wideband (UWB) doublet signal pulse based on the cross-gain modulation (XGM) in a semiconductor optical amplifier (SOA). In the scheme, only an optical source and an SOA are needed. As there is only one wavelength included in the output doublet signal pulse, no time difference between the upper and down pulses is introduced during the transmission process. By using the software of Optisystem 7.0, the impacts of the optical power, the SOA current, the wavelength and the input signal pulse width on the generated doublet pulse are simulated and tudied numerically. The results show that when the pulse width of the input signal pulse is larger, the output signal pulse is better, and is insensitive to the change of wavelength. In addition, the ultra-wideband positive and negative monocycles can be generated by choosing suitable optical source power and SOA current.展开更多
文摘海缆是海缆基础设施供电和通信的关键载体,海缆监测对于保障海缆基础设施安全稳定运行具有重要工程意义。针对海缆扰动监测需求开展海缆扰动探测试验研究。首先,搭建基于分布式光纤传感技术的海缆扰动探测试验系统,并接入南海深海海底观测网试验系统海缆暗光纤进行扰动探测试验,试验结果表明本系统能够有效探测铁锹拍击、车辆振动、海水冲刷及台风影响引起的海缆扰动。然后,根据海缆光纤瑞利背向散射(Rayleigh Backscattering,RBS)幅度信号特征,提出一种基于双向长短期记忆(Bidirectional Long Short-Term Memory,BiLSTM)神经网络的海缆扰动定位方法,本方法以海缆光纤RBS幅度信号的谱熵和瞬时频率作为特征参量输入,使用海缆光纤RBS幅度信号样本对本方法进行测试,结果表明本方法对海缆沿线扰动信号和非扰动信号的平均检测准确率高于99.6%。将海缆扰动探测试验系统与海缆扰动定位方法结合应用于海缆监测可有效探测海缆沿线扰动。
基金supported by the National Natural Science Foundation of China (No.60707006)the Natural Science Research Project of Jiangsu University (No.09KJB510009)the Scientific Research Foundation for Introducing Talent of Nanjing University of Posts & Telecom- munications (No.NY207142)
文摘We propose a novel scheme to generate the ultra-wideband (UWB) doublet signal pulse based on the cross-gain modulation (XGM) in a semiconductor optical amplifier (SOA). In the scheme, only an optical source and an SOA are needed. As there is only one wavelength included in the output doublet signal pulse, no time difference between the upper and down pulses is introduced during the transmission process. By using the software of Optisystem 7.0, the impacts of the optical power, the SOA current, the wavelength and the input signal pulse width on the generated doublet pulse are simulated and tudied numerically. The results show that when the pulse width of the input signal pulse is larger, the output signal pulse is better, and is insensitive to the change of wavelength. In addition, the ultra-wideband positive and negative monocycles can be generated by choosing suitable optical source power and SOA current.
