Distributed detection of quadratic Kerr effect in silica fibers using chirped-pulse φOTDR

Regina Magalhães; João Pereira; Andrés Garcia-Ruiz; Walter Margulis; Sonia Martin-Lopez; Miguel Gonzalez-Herraez; Hugo F. Martins

doi:10.1117/12.2540755

28 August 2019 Distributed detection of quadratic Kerr effect in silica fibers using chirped-pulse φOTDR

Regina Magalhães, João Pereira, Andrés Garcia-Ruiz, Walter Margulis, Sonia Martin-Lopez, Miguel Gonzalez-Herraez, Hugo F. Martins

Author Affiliations +

Proceedings Volume 11199, Seventh European Workshop on Optical Fibre Sensors; 1119929 (2019) https://doi.org/10.1117/12.2540755
Event: Seventh European Workshop on Optical Fibre Sensors, 2019, Limassol, Cyprus

Abstract

Monitoring the presence of external electric fields over large distances and detecting losses along power transmission networks, is of extreme importance nowadays due to concerns with environment, efficiency, cost and safety. In this work, we evaluate a method to achieve distributed measurements of the quadratic electro-optic Kerr effect in silica fibers in a distributed way. For this purpose, we integrate a twin-hole fiber filled with BiSn alloy electrodes and monitor its electric-field induced refractive index (RI) change Δn by using a chirped-pulse phase-sensitive OTDR (CP-ΦOTDR). By exploiting its high sensitivity (RI changes of the order of 10^-9 ), we demonstrate that the proposed system is able to detect the intrinsic quadratic electrooptic nonlinearity (the electric Kerr effect) in the fiber, an effect that is usually considered to be too weak to be exploited for practical applications. Additionally, we show that the CP-ΦOTDR is sufficiently sensitive to measure the electric Kerr effect with untreated standard telecommunication fibers under realistic fields.

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Regina Magalhães, João Pereira, Andrés Garcia-Ruiz, Walter Margulis, Sonia Martin-Lopez, Miguel Gonzalez-Herraez, and Hugo F. Martins "Distributed detection of quadratic Kerr effect in silica fibers using chirped-pulse φOTDR", Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 1119929 (28 August 2019); https://doi.org/10.1117/12.2540755

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