Enhancement for Φ-OTDR performance by using narrow linewidth light source and signal processing

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• 作者：Meng Zhang ; Song Wang ; Yuanwei Zheng ; Yao Yang ; Xingjie Sa ; Li Zhang
• 关键词：Phase unwrap ; frequency filter ; phase noise
• 刊名：Photonic Sensors
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：6
• 期：1
• 页码：58-62
• 全文大小：817 KB
• 参考文献：[1]H. Martins, S. Lopez, P. Corredera, M. Filograno, O. Frazao, and M. Herraez, “Coherent noise reduction in high visibility phase-sensitive optical time domain reflectometer for distributed sensing of ultrasonic waves,” Journal of Lightwave Technology, 2013, 31(23): 3631–3673.ADS CrossRef
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  [4]T. Zhu, X. Xiao, Q. He, and D. Diao, “Enhancement of SNR and spatial resolution in Φ-OTDR system by using two-dimensional edge detection method,” Journal of Lightwave Technology, 2013, 31(17): 2851–2856.ADS CrossRef
  [5]Z. Qin, L. Chen, and X. Bao, “Wavelet denoising method for improving detection performance of distributed vibration sensor,” IEEE Photonics Technology Letters, 2012, 24(7): 542–544.ADS CrossRef
  [6]L. Zhang, Z. Wang, S. Wang, N. Xue, X. Qian, M. Fan, et al., “Phase-sensitive optical time-domain reflectometry with I/Q demodulation,” in Asia Communications and Photonics Conference 2015, Hong Kong, pp. AM1I.3, 2015.
  [7]Y. Koyamad, M. Imahama, K. Kubota, and K. Hogari, “Fiber-optic distributed strain and temperature sensing with very high measurand resolution over long range using coherent OTDR,” Journal of Lightwave Technology, 2009, 27(9): 1142–1146.ADS CrossRef
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• 作者单位：Meng Zhang (1)
  Song Wang (2)
  Yuanwei Zheng (1)
  Yao Yang (1)
  Xingjie Sa (1)
  Li Zhang (2)
  
  1. Guizhou Power Grid Information and Communication Company, Guizhou, 550003, China
  2. Key Laboratory of Optical Fiber Sensing & Communications (Ministry of Education), University of Electronic Science and Technology of China, Chengdu, 611731, China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Chinese Library of Science
  Laser Technology and Physics and Photonics
  Microwaves, RF and Optical Engineering
  Measurement Science and Instrumentation
  Optics, Optoelectronics, Plasmonics and Optical Devices
  
• 出版者：University of Electronic Science and Technology of China, co-published with Springer
• ISSN：2190-7439

文摘

In order to enhance the signal-to-noise-ratio of a distributed acoustic sensing system based on phase-sensitive optical time-domain reflectometry (Φ-OTDR), we have proposed a combination of segmented unwrapping algorithm, averaging estimation of phase difference, and infinite impulse response (IIR) filtering method. The enhancement of signal quality is numerically demonstrated. Moreover, we have studied the influence resulted from the light source noise on the Φ-OTDR performance. The result has shown that when the linewidth of light source used in the Φ-OTDR system is narrower, the performance of the system is better. In a word, such a Φ-OTDR system could obtain higher quality demodulated signals when the narrower linewidth light source is chosen and the method of averaging estimation phase difference is used. Keywords Phase unwrap frequency filter phase noise