Self-copy-shift-based differential phase extracting method for fiber distributed acoustic sensing

Wenjie Chen; Junfeng Jiang; Kun Liu; Shuang Wang; Zhe Ma; Guanhua Liang; Zhenyang Ding; Tianhua Xu; Tiegen Liu

doi:10.3788/COL202018.081201

Journals >Chinese Optics Letters >Volume 18 >Issue 8 >Page 081201 > Article

Chinese Optics Letters
Vol. 18, Issue 8, 081201 (2020)

Self-copy-shift-based differential phase extracting method for fiber distributed acoustic sensing

Wenjie Chen^{1、2、3、4}, Junfeng Jiang^{1、2、3、*}, Kun Liu^1、2、3, Shuang Wang^1、2、3, Zhe Ma^1、2、3, Guanhua Liang^1、2、3, Zhenyang Ding^1、2、3, Tianhua Xu^1、2、3, and Tiegen Liu^1、2、3

Author Affiliations

¹School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China

²Key Laboratory of Opto-electronics Information Technology (Tianjin University), Ministry of Education, Tianjin 300072, China

³Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing of Tianjin University, Tianjin 300072, China

⁴Science and Technology on Communication Networks Laboratory, Shijiazhuang 050002, China

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DOI: 10.3788/COL202018.081201 Cite this Article Set citation alerts

Wenjie Chen, Junfeng Jiang, Kun Liu, Shuang Wang, Zhe Ma, Guanhua Liang, Zhenyang Ding, Tianhua Xu, Tiegen Liu. Self-copy-shift-based differential phase extracting method for fiber distributed acoustic sensing[J]. Chinese Optics Letters, 2020, 18(8): 081201 Copy Citation Text

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Abstract

A differential phase extracting method based on self-copy-shift for distributed acoustic sensing is proposed. Heterodyne and optical hybrids are used to realize high signal-to-noise ratio in-phase and quadrature-phase (IQ) signal measurement. The measured signals are self-copied and shifted for certain data points, and then they are digitally mixed with the original signals to construct the differential phase. The four produced signals are then combined to carry out IQ demodulation. An experiment with strain having an amplitude modulation waveform is carried out. The results showed that waveform information can be recovered well, and the signal-to-noise ratio achieves 32.8 dB.

Keywords

coherent OTDR distributed sensing optical fiber sensing phase extraction