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Related Experiment Video

Updated: Dec 27, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
08:23

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

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Low-cost multiple FBG interrogation technique for static applications.

Dia Darwich, Ayman Youssef, Haitham Zaraket

    Optics Letters
    |February 29, 2020
    PubMed
    Summary
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    A new, low-cost method interrogates multiple fiber Bragg gratings (FBGs) by tuning distributed feedback lasers. This technique achieves high accuracy for precise optical sensing applications.

    Area of Science:

    • Photonics and Optical Engineering
    • Fiber Optic Sensing Technology

    Background:

    • Fiber Bragg gratings (FBGs) are crucial optical sensing elements.
    • Interrogating multiple FBGs efficiently is a persistent challenge in optical sensing.

    Purpose of the Study:

    • To demonstrate a cost-effective technique for interrogating multiple FBGs.
    • To leverage the wavelength tuning capabilities of distributed feedback lasers for FBG interrogation.

    Main Methods:

    • Utilized distributed feedback lasers with current modulation and temperature variation for wavelength tuning.
    • Developed a novel interrogation setup for simultaneous FBG analysis.
    • Investigated the method's sensitivity and the impact of optical losses.

    Main Results:

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    • Successfully demonstrated a low-cost interrogation technique for multiple FBGs.
    • Achieved a measurement accuracy of 5 picometers (pm).
    • Characterized the sensitivity and optical loss effects on the interrogation performance.

    Conclusions:

    • The proposed method offers a practical and economical solution for multi-FBG interrogation.
    • The technique is suitable for applications requiring precise wavelength measurement.
    • Further optimization can enhance performance in the presence of significant optical losses.