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Boosting the spatial resolution in chirped pulse ϕ-OTDR using sub-band processing
Author(s): Leonardo Marcon; Marcelo A. Soto; Miguel Soriano-Amat; Luis Costa; Hugo F. Martins; Luca Palmieri; Miguel Gonzalez-Herraez
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Paper Abstract

Chirped pulse phase-sensitive optical time-domain reflectometry (chirped pulse Φ-OTDR) allows the interrogation of tens of kilometers of optical fiber with high sensitivity and linearity, but typically with spatial resolution limited to ten meters to ensure proper processing and signal-to-noise ratio (SNR). In this paper, we propose a method to increase the spatial resolution of a chirped pulse Φ-OTDR without reducing the pulse width. The improvement is achieved by adding an optical carrier to the input chirped pulse and by applying digital filtering to the measured backscatter traces. Experimental results validate the method, demonstrating a 10-fold resolution improvement with minimum impact on the measurement SNR.

Paper Details

Date Published: 28 August 2019
PDF: 4 pages
Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111991W (28 August 2019); doi: 10.1117/12.2539794
Show Author Affiliations
Leonardo Marcon, Univ. degli Studi di Padova (Italy)
Marcelo A. Soto, Univ. Técnica Federico Santa María (Chile)
Miguel Soriano-Amat, Univ. de Alcala` (Spain)
Luis Costa, Univ. de Alcala` (Spain)
Hugo F. Martins, Instituto de Óptica “Daza de Valdés” (Spain)
Luca Palmieri, Univ. degli Studi di Padova (Italy)
Miguel Gonzalez-Herraez, Univ. de Alcalá (Spain)


Published in SPIE Proceedings Vol. 11199:
Seventh European Workshop on Optical Fibre Sensors
Kyriacos Kalli; Sinead O. O'Keeffe; Gilberto Brambilla, Editor(s)

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