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Related Experiment Video

Updated: May 17, 2026

Wideband Optical Detector of Ultrasound for Medical Imaging Applications
08:21

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Published on: May 11, 2014

High-sensitivity direct-detection DAS system using a UWFBG array based on linear frequency modulation.

Qi Li, Yuanheng Zhao, Tianyu Mao

    Optics Letters
    |May 15, 2026
    PubMed
    Summary
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    Microwave photonic technology enhances distributed acoustic sensors using a linear-frequency-modulation pulse. This method improves vibration measurement resolution and sensitivity, significantly reducing the noise floor for better performance.

    Area of Science:

    • Photonics and Optical Sensing
    • Signal Processing
    • Fiber Optic Technology

    Background:

    • Microwave photonic (MWP) technology is crucial for advanced signal generation and processing in optical sensors.
    • Ultra-weak fiber Bragg grating (FBG) arrays are utilized in distributed acoustic sensing (DAS) for vibration detection.
    • Existing DAS methods face limitations in measurement resolution, sensitivity, and noise floor.

    Purpose of the Study:

    • To improve the performance of distributed acoustic sensors using MWP technology.
    • To achieve distributed positioning and quantitative vibration measurement with enhanced resolution and sensitivity.
    • To reduce the required bandwidth of the receiving end in DAS systems.

    Main Methods:

    • Implementation of MWP technology with an ultra-weak FBG array for DAS.

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    Last Updated: May 17, 2026

    Wideband Optical Detector of Ultrasound for Medical Imaging Applications
    08:21

    Wideband Optical Detector of Ultrasound for Medical Imaging Applications

    Published on: May 11, 2014

    Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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    Published on: March 22, 2019

  • Utilization of a linear-frequency-modulation (LFM) pulse as a probe signal to enhance the fiber nonlinearity threshold.
  • Application of a direct-detection scheme for vibration sensing.
  • Employing non-matching interference and chirp removal to reduce echo beating frequency.
  • Combining phase shift integration and empirical mode decomposition for signal demodulation.

    • Main Results:

    • Successful distributed positioning and quantitative measurement of vibration.
    • Effective improvement in the excitation threshold of fiber nonlinearity using LFM pulses.
    • Reduction of echo beating frequency to an integral multiple of the LFM probe repetition rate.
    • Demonstration of a significant noise floor reduction by at least 7.6 dB compared to existing methods.
    • Reduced bandwidth requirement for the receiving end.

    Conclusions:

    • MWP technology, combined with LFM pulses and advanced demodulation techniques, significantly enhances the performance of FBG-based distributed acoustic sensors.
    • The proposed method offers superior vibration measurement resolution, sensitivity, and a lower noise floor.
    • This approach provides a promising solution for high-performance distributed acoustic sensing applications.