Abstract

LOPEZ-MERCADO, C.A. et al. Algoritmo de optimización para la detección en un sistema ϕ-OTDR basado en un láser DFB encadenado a través de anillo resonador de fibra óptica. Rev. mex. fis. [online]. 2020, vol.66, n.5, pp.637-642.  Epub Jan 31, 2022. ISSN 0035-001X.  https://doi.org/10.31349/revmexfis.66.637.

We present a new spatial-temporal differential averaging algorithm that improves the capacity of our phase-sensitive optical time-domain reflectometry (ϕ−OTDR) system to vibration detection. Specifically, the system employs the standard DFB laser self-injection locked through an external feedback loop comprising a PM fiber-optic ring resonator that enhances coherence and provides enough frequency stability to the laser operation. The reported algorithm is responsible for 5-6 dB increase of the SNR thus improving the system ability to detect vibrations. We demonstrate the vibrations with the frequency of ∼815 Hz at the distance of ∼850 m localized with a spatial resolution of ∼20 m.

Keywords : Phase sensitive OTDR; self-injection locking; optical fiber ring resonator.