Abstract
In this paper, a new distributed fiber optic sensor system based on dual sensing directions by polarization optical time-domain reflectometer (POTDR) is proposed. Using a single POTDR scheme, the system is able to detect signals in the forward direction and backward direction simultaneously. It can detect more perturbations applied on the fiber simultaneously than a traditional POTDR. It can also improve the positioning accuracy of POTDR by judging the perturbations from both directions. The proposed method is cost effective and has good potential in the application of intrusion monitoring.
Highlights
In this paper, a new distributed fiber optic sensor system based on dual sensing directions by polarization optical time-domain reflectometer (POTDR) is proposed
Using a single POTDR scheme, the system is able to detect signals in the forward direction and backward direction simultaneously. It can detect more perturbations applied on the fiber simultaneously than a traditional POTDR
Polarization optical time domain reflectometer (POTDR) is a kind of distributed optical fiber sensors which can measure the vibrations along the fiber under test (FUT) [1]–[4]
Summary
Polarization optical time domain reflectometer (POTDR) is a kind of distributed optical fiber sensors which can measure the vibrations along the fiber under test (FUT) [1]–[4]. It realizes measurement by analyzing the variation of the state of polarization (SOP) which is sensitivity to external perturbations of FUT. POTDR has many advantages such as simple configuration, low cost, easy implementation. Zhang et al realized distributed measurement of vibration signals along the fiber by using the fast Fourier transform (FFT) method on POTDR sensor curve, which can simultaneously sense multiple perturbation events [13].
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