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Writing Bragg Gratings in Multicore Fibers
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High-resolution slow-light fiber Bragg grating temperature sensor with phase-sensitive detection.

Arushi Arora, Mina Esmaeelpour, Martin Bernier

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    |July 14, 2018
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    Summary
    This summary is machine-generated.

    This study introduces a novel slow-light fiber Bragg grating (FBG) temperature sensor. It achieves unprecedented temperature resolution and stability, ideal for detecting minute thermal variations in sensitive applications.

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    Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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    Area of Science:

    • Optics and Photonics
    • Fiber Optic Sensing
    • Metrology

    Background:

    • Accurate temperature sensing is crucial for various scientific and industrial applications.
    • Existing sensors often face limitations in resolution, drift, or self-heating.
    • Fiber Bragg gratings (FBGs) offer a robust platform for sensing, but enhancing their temperature sensitivity is an ongoing challenge.

    Purpose of the Study:

    • To develop and characterize a slow-light fiber Bragg grating (FBG) based temperature sensor.
    • To achieve record-breaking temperature resolution and minimal drift for enhanced measurement precision.
    • To demonstrate the sensor's utility in detecting small temperature changes and measuring weak optical losses.

    Main Methods:

    • Fabrication of a slow-light fiber Bragg grating.
    • Characterization of the FBG's temperature response, resolution, and drift.
    • Application of the sensor to measure heat generated in a Yb-doped fiber.
    • Utilizing the sensor to quantify internal absorption loss within the FBG itself.

    Main Results:

    • Achieved a record temperature resolution of approximately 0.3 m°C/√Hz.
    • Demonstrated minimal temperature drift of approximately 1 m°C over a 30-second measurement period.
    • Reported negligible self-heating of the sensor during operation.
    • Successfully measured weak internal absorption loss (0.02 m⁻¹) in the slow-light FBG, accounting for only ~2% of total loss.

    Conclusions:

    • The developed slow-light FBG temperature sensor offers superior performance for detecting minute temperature variations.
    • Its high resolution, low drift, and negligible self-heating make it suitable for demanding applications like calorimetry and radiation-balanced lasers.
    • The sensor provides a valuable tool for precise thermal measurements and characterization of optical components.