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Chinese Optics Letters, Volume. 23, Issue 5, 051201(2025)

High-performance multimode fiber specklegram sensing with a multi-layer convolutional neural network based on digital aperture filtering

Ya Wen1, Xing Zhao1,2,3, Zhixiang Jiang1, and Da Li1,2,3、*
Author Affiliations
  • 1Institute of Modern Optics, Eye Institute, Nankai University, Tianjin 300350, China
  • 2Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Tianjin 300350, China
  • 3Prosper-Vision (Tianjin) Optoelectronics Technology Co., Tianjin 300192, China
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    (a) Schematic diagram of a light field direction sensing system; (b) speckle patterns of different fibers under specific light field directions; (c) the variation of speckle correlation coefficients of different fibers with the light field direction.

    Fig. 1. (a) Schematic diagram of a light field direction sensing system; (b) speckle patterns of different fibers under specific light field directions; (c) the variation of speckle correlation coefficients of different fibers with the light field direction.

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    The angular PSF curves corresponding to the speckles emitted from (a) MMF 1 and (b) MMF 2; the variation of the speckle correlation coefficient with the light field direction and the decorrelation angle for (c) MMF 1 and (d) MMF 2. ‘a’ represents the radius of the fiber.

    Fig. 2. The angular PSF curves corresponding to the speckles emitted from (a) MMF 1 and (b) MMF 2; the variation of the speckle correlation coefficient with the light field direction and the decorrelation angle for (c) MMF 1 and (d) MMF 2. ‘a’ represents the radius of the fiber.

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    The structural diagram of the proposed MLCNN.

    Fig. 3. The structural diagram of the proposed MLCNN.

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    The MAE and S.D. of light field direction sensing results for MMF 1 and FMF 1. (a) Test set I; (b) Test set II.

    Fig. 4. The MAE and S.D. of light field direction sensing results for MMF 1 and FMF 1. (a) Test set I; (b) Test set II.

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    The MAE and S.D. of light field direction sensing results for MMF 2 and FMF 1. (a) Test set I; (b) Test set II.

    Fig. 5. The MAE and S.D. of light field direction sensing results for MMF 2 and FMF 1. (a) Test set I; (b) Test set II.

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    • Table 1. Comparison of Light Field Direction Sensing Results Using Various Fibers With Different Methods

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      Table 1. Comparison of Light Field Direction Sensing Results Using Various Fibers With Different Methods

       Test set ITest set II
       MAE (°)S.D. (°)MaxAE (°)MAE (°)S.D. (°)MaxAE (°)
      MMF 1-uFSD0.01390.01150.03480.03580.03380.1524
      MMF 1-DAF0.00650.00520.01640.01580.01160.0505
      Reduction53%55%53%56%66%67%
      MMF 2-uFSD0.01930.01700.04150.08070.07350.3607
      MMF 2-DAF0.01080.00900.03150.04100.03670.1728
      Reduction44%47%24%49%50%52%
      FMF 1-uFSD0.00610.00480.01360.01450.01070.0299
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    Ya Wen, Xing Zhao, Zhixiang Jiang, Da Li, "High-performance multimode fiber specklegram sensing with a multi-layer convolutional neural network based on digital aperture filtering," Chin. Opt. Lett. 23, 051201 (2025)

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    Paper Information

    Category: Instrumentation, Measurement, and Optical Sensing

    Received: Oct. 20, 2024

    Accepted: Dec. 10, 2024

    Published Online: May. 14, 2025

    The Author Email: Da Li (da.li@nankai.edu.cn)

    DOI:10.3788/COL202523.051201

    CSTR:32184.14.COL202523.051201

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology