Influences of laser source on phase-sensitivity optical time-domain reflectometer-based distributed intrusion sensor Xiang Zhong,1 Chunxi Zhang,1 Lijing Li,1,* Sheng Liang,2 Qin Li,1 Qiying Lü,1 Xiuxin Ding,1 and Qiaoyuan Cao1 1
School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China 2
Key Laboratory of Education Ministry on Luminescence and Optical Information Technology, Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044, China *Corresponding author: [email protected] Received 26 March 2014; revised 29 May 2014; accepted 30 May 2014; posted 11 June 2014 (Doc. ID 208960); published 11 July 2014
This paper investigates the influences of laser source on distributed intrusion sensor based on a phasesensitivity optical time-domain reflectometer (φ-OTDR). A numerical simulation is performed to illustrate the relationships between trace-to-trace fluctuations and frequency drift rate as well as pulse width, and fluctuations ratio coefficient (FRC) is proposed to evaluate the level of trace-to-trace fluctuations. The simulation results show that the FRC grows with increasing frequency drift rate and pulse width, reaches, and maintains the peak value when the frequency drift rate and/or the pulse width are high enough. Furthermore, experiments are implemented using a φ-OTDR prototype with a low frequency drift laser (
School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China 2
Key Laboratory of Education Ministry on Luminescence and Optical Information Technology, Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044, China *Corresponding author: [email protected] Received 26 March 2014; revised 29 May 2014; accepted 30 May 2014; posted 11 June 2014 (Doc. ID 208960); published 11 July 2014
This paper investigates the influences of laser source on distributed intrusion sensor based on a phasesensitivity optical time-domain reflectometer (φ-OTDR). A numerical simulation is performed to illustrate the relationships between trace-to-trace fluctuations and frequency drift rate as well as pulse width, and fluctuations ratio coefficient (FRC) is proposed to evaluate the level of trace-to-trace fluctuations. The simulation results show that the FRC grows with increasing frequency drift rate and pulse width, reaches, and maintains the peak value when the frequency drift rate and/or the pulse width are high enough. Furthermore, experiments are implemented using a φ-OTDR prototype with a low frequency drift laser (
