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Space division multiplexing in standard multi-mode optical fibers based on speckle pattern classification.

Jaël Pauwels1, Guy Van der Sande2, Guy Verschaffelt2

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Researchers developed a new space division multiplexing method for optical fibers using speckle pattern classification. This technique increases telecommunication capacity by detecting multiple signals within a standard multimode fiber.

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Area of Science:

  • Optical Communications
  • Photonics
  • Signal Processing

Background:

  • Single mode optical fibers are nearing their transmission bandwidth limits.
  • Existing multiplexing techniques (amplitude, quadrature, polarization, frequency) are nearly exhausted.
  • Space division multiplexing (SDM) offers a path to increase optical communication capacity.

Purpose of the Study:

  • To demonstrate a novel space division multiplexing technique for optical fibers.
  • To leverage speckle pattern classification for signal detection in multimode fibers.
  • To assess the robustness of the proposed SDM technique against fiber imperfections.

Main Methods:

  • Coupling multiple optical signals into a standard multimode optical fiber.
  • Generating and analyzing speckle patterns at the fiber output.
  • Classifying speckle patterns to identify and detect independent optical signals.
  • Investigating the influence of signal beam parameters and fiber length on speckle patterns.

Main Results:

  • Speckle patterns at the fiber output are formed by quasi-random interference of excited propagation modes.
  • Speckle pattern characteristics are dependent on optical signal beam parameters and fiber length.
  • Successful classification of speckle patterns enabled detection of independent multiplexed signals (e.g., on/off states).
  • The proposed SDM technique demonstrated robustness against mode-mixing and polarization scrambling.

Conclusions:

  • The experimental demonstration confirms the feasibility of the novel space division multiplexing technique.
  • Speckle pattern classification provides a viable method for demultiplexing signals in multimode fibers.
  • This approach offers a promising solution for enhancing optical communication capacity using standard fiber infrastructure.