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Temperature sensor based on an erbium-doped fiber Sagnac interferometer.

João Paulo Lebarck Pizzaia, Rodolpho Ladislau Silva, Arnaldo Gomes Leal-Junior

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    A novel all-fiber temperature sensor using erbium-doped fiber (EDF) in a Sagnac interferometer achieves high sensitivity. This passive sensing approach offers a new option for precise temperature monitoring.

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    Area of Science:

    • Fiber optics
    • Optical sensing
    • Interferometry

    Background:

    • Highly sensitive temperature sensors are crucial for various applications.
    • Sagnac interferometers offer a robust platform for optical sensing.
    • Enhancing sensor sensitivity and linearity is an ongoing research area.

    Purpose of the Study:

    • To develop a highly sensitive all-fiber temperature sensor.
    • To investigate the use of erbium-doped fiber (EDF) as a passive sensing element.
    • To evaluate the performance of the proposed sensor configuration.

    Main Methods:

    • A Sagnac interferometer was constructed using 10 m of EDF.
    • The EDF was utilized as a passive sensing element, leveraging its induced birefringence.
    • Standard interrogation of interference peaks was employed to detect temperature variations.

    Main Results:

    • The developed sensor demonstrated high sensitivity, up to 0.2 nm/°C.
    • The sensor exhibited high linearity in its response to temperature changes.
    • The use of EDF as a passive element proved effective for temperature sensing.

    Conclusions:

    • Erbium-doped fiber can be effectively used as a passive element in Sagnac interferometer-based temperature sensors.
    • This approach offers a promising method for extending the capabilities of highly sensitive temperature sensors.
    • The demonstrated sensor provides a new option for precise and reliable temperature monitoring.