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Updated: Jun 19, 2026

Writing Bragg Gratings in Multicore Fibers

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Large Range Curvature Measurement Using FBGs in Two-Core Fiber with Protective Coating.

Ruibin Chen¹, Lutian Li¹, Qianqing Yu²

¹Research Center for Advanced Optics and Photoelectronics, Department of Physics, College of Science, Shantou University, Shantou 515063, China.

|November 27, 2024

Summary

This study introduces a robust fiber Bragg grating (FBG) sensor for precise curvature measurements. The novel dual-grating design minimizes temperature and humidity interference, offering reliable sensing for engineering applications.

Keywords:

FBG curvature measurements two-core fiber

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Published on: March 8, 2020

Area of Science:

Optical Engineering
Materials Science

Background:

Fiber Bragg gratings (FBGs) are widely used in sensing applications.
Asymmetric fiber structures can exhibit direction-dependent bending characteristics.
Cross-sensitivity to environmental factors like temperature and humidity is a challenge in FBG sensors.

Purpose of the Study:

To develop and characterize a novel FBG-based sensor for accurate curvature measurements.
To investigate the use of a two-core fiber with asymmetric gratings for enhanced sensing performance.
To mitigate temperature and humidity cross-sensitivity in curvature sensing.

Main Methods:

Inscribing two FBGs on a specialty two-core optical fiber using femtosecond laser pulses and point-by-point direct writing.
One FBG was inscribed on the central core near an air channel, and the other on the eccentric core.
Analyzing the bending sensitivity and cross-sensitivity of the FBG sensor to temperature and humidity.

Main Results:

Achieved a bending sensitivity of 58 pm/m⁻¹ for the FBG in the eccentric core within a 0-50 m⁻¹ curvature range.
Demonstrated that bending characteristics are direction-dependent due to fiber asymmetry.
Showed significant reduction in temperature and humidity cross-sensitivity by analyzing differential peak shifts between the two gratings.

Conclusions:

The proposed FBG sensor offers a large sensing range and robust performance, suitable for engineering applications.
The dual-grating design in an asymmetric two-core fiber effectively addresses cross-sensitivity issues.
This sensor represents a promising solution for high-performance curvature sensing.