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Related Experiment Video

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Efficient light focusing through an MMF based on two-step phase shifting and parallel phase compensating.

Hui Chen, Yi Geng, Chengfang Xu

    Applied Optics
    |November 2, 2019
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    This study introduces an efficient wavefront shaping method using a spatial light modulator (SLM) to rapidly create multiple focused spots through multimode fibers (MMF). The technique enables quick generation of numerous focused spots with high precision.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optics Communications

    Background:

    • Multimode fibers (MMF) are crucial for high-bandwidth data transmission.
    • Controlling light propagation through MMF for applications like imaging and sensing is challenging.

    Purpose of the Study:

    • To develop an efficient wavefront shaping method for generating multiple focused spots through MMF.
    • To enable rapid and precise control of light delivery via MMF.

    Main Methods:

    • A parallel phase compensation scheme utilizing a spatial light modulator (SLM).
    • A two-step phase-shifting technique to obtain compensated phase masks.
    • A parallel algorithm for retrieving multiple phase masks for different target locations.

    Main Results:

    • Experimentally generated 100 tightly focused spots through MMF.
    • Achieved an average focused efficiency of 21.60%.
    • Obtained an average focused spot diameter of 1.9240 μm with a single optimization pass.

    Conclusions:

    • The proposed method offers an efficient and rapid approach for generating multiple focused spots through MMF.
    • This technique simplifies the process by requiring only one-time parallel-compensated phase retrieval.
    • The method has potential applications in optical communication, microscopy, and beam steering.