Anisotropic optical fiber in distributed acoustic sensing

Abstract

This work presents one of the ways to use anisotropic optical fiber as a sensing element in distributed acoustic sensing. Unique features of the created setup are based on the ability the probe the sensing element with a pulse of ligth from both of its sides in opposite directions and polarization axes continuously, without the reconnection or movement of the interrogator. A hypothesis under investigation was the opportunity to enhance the resolution of the multiple close events on the fiber with the proposed sensing element construction. Initial tests have been carried out under static events, e.g. inducted losses. Though the method is theoretically not limited by this type of anisotropic optical fiber, the present research includes the data obtained only with the "Panda" fiber. We believe the setup can be a more comfortable analog to the two-way trace analysis in a bunch of distributed acoustic sensors' applications. Higher losses of anisotropic fiber, comparing to the SMF-28, for example and higher price of the whole setup turn out to be its main disadvantages. Despite the fact that current report is based on the setup interaction with optical time-domain reflectometer, the crucial aim of the research is its application in coherent distributed optical sensing system, like the one for agriculture and biological purposes proposed before.

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Artem Turov
Perm National Research Polytechnical University, Perm Federal Research Center of the Ural Branch of the Russian Academy of Sciences
Russia

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