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Mode division multiplexing reconstructive spectrometer with an all-fiber photonics lantern.

Junrui Liang1, Jun Ye1,2,3, Xiaoya Ma1

  • 1College of Advanced Disciplinary Studies, National University of Defense Technology, Changsha, 410073, China.

Frontiers of Optoelectronics
|July 16, 2024
PubMed
Summary

This study introduces a novel all-fiber mode division multiplexing reconstructive spectrometer. It achieves high spectral resolution and accuracy by utilizing multi-mode excitation in multimode fibers for advanced spectral analysis.

Keywords:
High-accuracyMode division multiplexingPhotonics lanternReconstructive spectrometerResolution enhancement

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Area of Science:

  • Photonics
  • Spectroscopy
  • Optical Engineering

Background:

  • Mode division multiplexing (MDM) offers potential for increased data capacity.
  • Reconstructive spectroscopy (RS) enables high-resolution spectral analysis.
  • Integrating MDM with RS in all-fiber systems presents challenges.

Purpose of the Study:

  • To develop a high-accuracy, all-fiber MDM reconstructive spectrometer.
  • To enhance spectral resolution and accuracy using multi-mode excitation.
  • To demonstrate the feasibility of programmable mode excitations for spectral measurements.

Main Methods:

  • Utilized a custom 3x1 mode-selective photonics lantern for distinct spatial mode excitation.
  • Employed multimode fiber (MMF) to encode spectral information into speckle patterns.
  • Implemented an alternating mode modulation approach for resolution enhancement.

Main Results:

  • Achieved a spectral resolution of 2 pm and recovered 2000 spectral channels.
  • Reduced recovered error by 88% (3-mode) and 50% (2-mode) compared to single-mode excitation.
  • Reached the MMF limit for spectral correlation function's 3 dB bandwidth.

Conclusions:

  • The developed all-fiber MDM RS is accurate, efficient, and high-resolution.
  • Multi-mode excitation significantly improves spectral recovery accuracy.
  • The system is suitable for diverse high-accuracy spectral measurement applications.