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The influences of pulse, including the pulse width Tp and the peak pulse power Ipeak, on phase-sensitivity optical time-domain reflectometer (φ-OTDR) based distributed vibration sensor are investigated in this paper. A numerical simulation is performed to illustrate the relationships between pulse and temporal response trace as well as the visibility of interferential Rayleigh backscattering light...
In dual Mach-Zehnder interferometry sensing system, polarization induced phase distortion (including polarization induced phase shift (PIPS)) will lead to big location errors. By analyzing relationship of phase shift and polarization state (PS) of transmitted light, a simplified polarization control method using polarized light and a half-wave plate is proposed to eliminate PIPS. In this method, half-wave...
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