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Related Concept Videos

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Random or indeterminate errors originate from various uncontrollable variables, such as variations in environmental conditions, instrument imperfections, or the inherent variability of the phenomena being measured. Usually, these errors cannot be predicted, estimated, or characterized because their direction and magnitude often vary in magnitude and direction even during consecutive measurements. As a result, they are difficult to eliminate. However, the aggregate effect of these errors can be...
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Related Experiment Video

Updated: Jan 30, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Random phase-shift Bragg grating-based random fiber laser with a half-open cavity.

Ailing Zhang, Liyue Hao

    Applied Optics
    |January 16, 2019
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    Summary
    This summary is machine-generated.

    This study demonstrates a stable single-wavelength random fiber laser using a novel random phase-shift fiber Bragg grating. This laser shows potential for tunable wavelength applications and refractive index sensing.

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    Area of Science:

    • Photonics and Laser Technology
    • Fiber Optics
    • Optical Sensing

    Background:

    • Random fiber lasers offer unique spectral properties.
    • Fiber Bragg gratings (FBGs) are crucial for laser cavity design.
    • Controlling randomness in FBGs can enhance laser performance.

    Purpose of the Study:

    • To experimentally demonstrate a random fiber laser utilizing a random phase-shift fiber Bragg grating.
    • To investigate the output characteristics of such a laser under varying conditions.
    • To explore the potential for wavelength tuning and refractive index sensing.

    Main Methods:

    • Fabrication of a 25 mm long random phase-shift fiber Bragg grating using the beam-scanning method.
    • Implementation of a half-open cavity configuration for the fiber laser.
    • Characterization of laser performance, including pump threshold, optical signal-to-noise ratio, and 3 dB bandwidth.
    • Testing wavelength sensitivity to surrounding refractive index changes using NaCl solutions.

    Main Results:

    • Achieved stable single-wavelength laser operation with a low pump threshold of 25 mW.
    • Obtained a high optical signal-to-noise ratio of 67 dB and a 3 dB bandwidth of 17.7 pm at 350 mW pump power.
    • Demonstrated a linear relationship between emitted wavelength and surrounding refractive index.

    Conclusions:

    • The developed random phase-shift FBG fiber laser provides stable, single-wavelength output.
    • The laser's sensitivity to refractive index changes offers a promising avenue for sensor applications.
    • This technology has potential for tunable laser sources and precise refractive index detection.