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Distributed shape sensing using Brillouin scattering in multi-core fibers.

Zhiyong Zhao, Marcelo A Soto, Ming Tang

|November 10, 2016

Summary

This study shows multi-core optical fibers can detect bending. This breakthrough enables distributed fiber optic shape sensing, mapping a fiber

Area of Science:

Optics and Photonics
Fiber Optic Sensing
Materials Science

Background:

Brillouin scattering is a key phenomenon in optical fibers.
Multi-core optical fibers (MCF) offer potential for advanced sensing applications.
Fiber bending induces strain, affecting light propagation characteristics.

Purpose of the Study:

To investigate the bending response of Brillouin scattering in MCF.
To develop a novel distributed optical fiber sensor for shape sensing.
To demonstrate the feasibility of mapping longitudinal fiber shape using MCF.

Main Methods:

Theoretical modeling of Brillouin scattering in curved MCF.
Experimental validation using Brillouin optical time-domain analysis (BOTDA).

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Differential pulse-width pairs technique for distributed sensing.

Main Results:

Brillouin frequency shift in off-center MCF cores is linearly dependent on fiber curvature.
Successful demonstration of fully distributed shape sensing over a 1 km MCF.
Experimental data aligns well with theoretical predictions.

Conclusions:

MCF exhibits a strong bending-dependent Brillouin scattering response.
This forms the basis for a new distributed bending and shape sensing technology.
Paves the way for future 3D distributed shape sensing applications.