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Related Experiment Video

Updated: Jan 30, 2026

Writing Bragg Gratings in Multicore Fibers
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Highly sensitive fiber Bragg grating-based pressure sensor using side-hole packaging.

Suneetha Sebastian, S Sridhar, P Shiva Prasad

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

    Optimizing side-hole packaging significantly enhances fiber Bragg grating (FBG) sensor pressure sensitivity. This advancement enables highly sensitive FBG hydrophones for underwater acoustic signal detection.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Sensor Technology

    Background:

    • Fiber Bragg Grating (FBG) sensors are crucial for various sensing applications.
    • Enhancing the pressure sensitivity of FBG sensors is key for applications like hydrophones.
    • Existing FBG sensors have limitations in detecting subtle pressure variations.

    Purpose of the Study:

    • To analyze and optimize the pressure response of FBG sensors within a novel side-hole packaging.
    • To investigate the impact of packaging parameters on FBG sensor sensitivity.
    • To achieve unprecedented pressure sensitivity for FBG-based sensing systems.

    Main Methods:

    • Utilizing the finite element method (FEM) for detailed analysis.
    • Systematically varying and optimizing side-hole packaging parameters: hole radius, separation distance, package radius and length, and material choice.
    • Comparing the performance of the optimized package with a bare FBG sensor.

    Main Results:

    • Achieved a pressure sensitivity enhancement of approximately 10^5 times compared to a bare FBG sensor.
    • Optimized side-hole package FBG sensor demonstrated a sensitivity of ~280,000 pm/MPa, up from 3 pm/MPa for a bare sensor.
    • Demonstrated the feasibility of significantly boosting FBG sensor performance through optimized packaging.

    Conclusions:

    • The optimized side-hole packaging dramatically increases FBG sensor pressure sensitivity.
    • This breakthrough represents a significant step towards developing highly sensitive FBG-based hydrophones.
    • The findings pave the way for advanced underwater acoustic sensing technologies.