Abstract

The round-trip time of the light pulse limits the maximum detectable vibration frequency response range of phase-sensitive optical time domain reflectometry (ϕ-OTDR). Unlike the uniform laser pulse interval in conventional ϕ-OTDR, we randomly modulate the pulse interval so that an equivalent sub-Nyquist additive random sampling (sNARS) is realized for every sensing point of the long interrogation fiber. For a ϕ-OTDR system with 10 km sensing length, the sNARS method is optimized by theoretical analysis and Monte Carlo simulation, and the experimental results verify that a wideband sparse signal can be identified and reconstructed. Such a method can broaden the vibration frequency response range of ϕ-OTDR, which is of great significance in sparse-wideband-frequency vibration signal detection.

© 2018 Optical Society of America

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Supplementary Material (6)

NameDescription
» Visualization 1       PSD spectra with different maximum sampling time interval factor kt.
» Visualization 2       VPSD spectra with different AWG sampling rate fs-awg.
» Visualization 3       PSD spectra with different sampling length N.
» Visualization 4       PSD spectra with different analytical frequency resolution factor ka when N equals 1000.
» Visualization 5       The signal reconstruction process. Upper figure: the PSD spectra of the sNRS signal residual. Black dots,
» Visualization 6       The signal reconstruction process. Upper figure: the PSD spectra of the sNRS signal residual. Black dots,

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