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Intensity-only-measurement mode decomposition in few-mode fibers.

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    Summary

    Researchers developed a faster optical phase recovery method for multi-mode fibers. This new technique enhances signal-to-noise ratio, improving optical field and mode decomposition accuracy.

    Area of Science:

    • Optics
    • Photonics
    • Fiber optics

    Background:

    • Recovering optical phases from intensity measurements is challenging due to the ill-posed nature of the problem.
    • Multi-mode fibers (MMFs) utilize eigenmode structures to aid in optical field reconstruction and mode decomposition.
    • Existing methods for mode decomposition in MMFs have limitations in speed and accuracy.

    Purpose of the Study:

    • To develop and validate a novel, high-speed mode decomposition technique for multi-mode fibers.
    • To improve the signal-to-noise ratio (SNR) in optical phase recovery for MMFs.
    • To outperform existing methods in terms of the number of modes resolved and decomposition speed.

    Main Methods:

    • Numerical simulations and experimental validation of a new mode decomposition algorithm.

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  • Utilizing the inherent eigenmode structure of multi-mode fibers for phase recovery.
  • Intensity distribution measurements for reconstructing the optical field.

    • Main Results:

    • The proposed technique achieves mode decomposition comparable in speed to the fastest existing methods.
    • Demonstrated superior performance in resolving a higher number of modes compared to previous techniques.
    • Achieved significant SNR improvements: 10 dB for a 3-mode fiber and 7.5 dB for a 5-mode fiber.

    Conclusions:

    • The developed technique offers a significant advancement in optical phase recovery and mode decomposition for multi-mode fibers.
    • This method provides enhanced accuracy and efficiency for applications requiring precise optical field reconstruction.
    • The improved SNR facilitates more robust and reliable optical signal processing in complex fiber systems.