• Acta Optica Sinica
  • Vol. 41, Issue 13, 1306023 (2021)
Zhen Zhong1、2, Xuping Zhang2、*, and Ningmu Zou3
Author Affiliations
  • 1School of Photoelectric Engineering, Changzhou Institute of Technology, Changzhou, Jiangsu 213002, China
  • 2Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education,Nanjing University, Nanjing, Jiangsu 210093, China
  • 3School of Computer Science, Georgia Institute of Technology, Atlanta 30332, USA
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    DOI: 10.3788/AOS202141.1306023 Cite this Article Set citation alerts
    Zhen Zhong, Xuping Zhang, Ningmu Zou. Enhancement of Measurable Range for Acoustic Signal in Phase Optical Time Domain Reflector[J]. Acta Optica Sinica, 2021, 41(13): 1306023 Copy Citation Text show less

    Abstract

    This paper proposes a new method of phase unwrapping based on auxiliary light, which is used to break the limitation of traditional phase unwrapping algorithm and expand the measurement range of phase signal. First, based on the wrapped statistical phase in coherent detection based phase optical time domain reflectometer, the wrapped differential phase the reference position and the subsequent position can be solved. Then, based on the joint pulse sequence, the wrapped differential phase is unwrapped according to the traditional phase unwrapping algorithm, and the phase change curves retrieved from the unwrapped differential phases are superimposed together. The position of fiber that correctly implements the traditional phase unwrapping algorithm can be obtained from the linear feature of the superimposed phase change curve. Therefore, the phase signal corresponding to the disturbance source can be correctly obtained based on this linear feature of phase change. In the experiment, a phase signal with a maximum absolute phase difference of 3.7154 between adjacent sampling points can be perfectly reconstructed.
    Zhen Zhong, Xuping Zhang, Ningmu Zou. Enhancement of Measurable Range for Acoustic Signal in Phase Optical Time Domain Reflector[J]. Acta Optica Sinica, 2021, 41(13): 1306023
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