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Spatial-division multiplexed Brillouin distributed sensing based on a heterogeneous multicore fiber.

Zhiyong Zhao, Yunli Dang, Ming Tang

|January 7, 2017

Summary

This study uses spatial-division multiplexing (SDM) in heterogeneous multicore fiber for simultaneous temperature and strain sensing. It overcomes bending effects for accurate Brillouin distributed sensing.

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Area of Science:

Optoelectronics
Fiber Optic Sensing
Materials Science

Background:

Brillouin optical time-domain analysis (BOTDA) is a key technology for distributed fiber sensing.
Heterogeneous multicore fibers offer potential for multiplexed sensing applications.
Distinguishing between temperature and strain is crucial for accurate BOTDA measurements.

Purpose of the Study:

To investigate spatial-division multiplexed (SDM) BOTDA in a heterogeneous multicore fiber.
To achieve simultaneous and discriminative temperature and strain measurements.
To address and resolve the issue of bending-induced Brillouin gain spectrum (BGS) broadening.

Main Methods:

Experimental investigation of SDM BOTDA in a custom-designed heterogeneous multicore fiber.
Characterization of Brillouin frequency shift (BFS) differences and temperature/strain sensitivities of different cores.
Development of a method to mitigate bending-induced BFS shifts by averaging symmetrical core data.

Main Results:

A BFS difference of ~70 MHz was observed between the central and outer cores.
Distinct temperature sensitivities but similar strain sensitivities were found for the central and outer cores.
Simultaneous and discriminative temperature and strain measurements were successfully demonstrated.
A solution for bending-induced BGS broadening was proposed and validated.

Conclusions:

Heterogeneous multicore fibers combined with SDM-BOTDA enable precise, simultaneous temperature and strain sensing.
The proposed method effectively eliminates uncertainty caused by bending, enhancing sensor reliability.
This work presents a novel approach for discriminative measurements in Brillouin distributed sensors using SDM.