10 January 2018 Application of the probe pulse with ergodic SOPs in detecting multi-vibrations using POTDR
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Proceedings Volume 10618, 2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications; 1061805 (2018) https://doi.org/10.1117/12.2295319
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China
Abstract
Polarization Optical Time Domain Reflectometer (POTDR) can be used to detect the external vibration information by measuring the change of state of polarization (SOP) of the Rayleigh backscattering along the sensing fiber. However, the traditional POTDR system is suffer from the false negative when the vibrations along the fiber are with the same frequency. In this article, we propose and numerically simulated a scheme of POTDR system which can be used to detect multi-vibration with the same frequency. By scanning the SOP of the probe pulse, a series of vibration spectra along the fiber are obtained. The sum of these vibration spectra whose amplitudes are theoretical immune to certain SOP of the probe pulse and birefringence of the sensing fiber is used to analyze the external vibration information. The proposed system with input SOPs of uniform distribution and random distribution are analyzed by numerical simulation, respectively. The misdiagnosis rate of detecting multi-vibrations with different frequencies are greatly reduced. In addition, multi-vibrations with same frequency detection system using POTDR is successfully achieved by analyzing the amplitude change of the add up spectra along the sensing fiber, which would greatly promote the development of POTDR.
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Jintao Hu, Jintao Hu, Xiangchuan Wang, Xiangchuan Wang, Shilong Pan, Shilong Pan, "Application of the probe pulse with ergodic SOPs in detecting multi-vibrations using POTDR", Proc. SPIE 10618, 2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications, 1061805 (10 January 2018); doi: 10.1117/12.2295319; https://doi.org/10.1117/12.2295319
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