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Design of Single-Mode Single-Polarization Large-Mode-Area Multicore Fibers.

Kamyar Rashidi1, Davood Fathi1, Javad Maleki1

  • 1Department of Electrical and Computer Engineering, Tarbiat Modares University (TMU), Tehran 1411713116, Iran.

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Summary
This summary is machine-generated.

Researchers developed novel multicore fibers with large mode areas (LMA) and high beam quality for fiber lasers. These advanced LMA fibers maintain single-mode, single-polarization operation, enhancing laser and amplifier efficiency.

Keywords:
designlarge-mode-areanulticore fiberquality factorsingle-modesingle-polarization

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Area of Science:

  • Laser Science and Photonics
  • Materials Science and Engineering

Background:

  • Evanescently coupled multicore fibers are less studied due to small mode areas in single-mode operation.
  • Optimizing multicore fiber design is crucial for advancing fiber laser and amplifier technologies.

Purpose of the Study:

  • To propose and optimize a novel 37-core fiber structure with stress-applying parts.
  • To achieve large mode area (LMA) and high beam quality in single-mode, single-polarization operation.
  • To investigate the performance of designed fibers under various operational conditions and tolerances.

Main Methods:

  • Utilized a comprehensive optimization framework for a 37-core fiber structure with integrated stress-applying parts.
  • Analyzed fiber designs for large mode area (up to 880 μm²) and high beam quality (M² factor down to 1.05).
  • Conducted tolerance analysis to assess performance robustness against deviations in core pitch, bending, and orientation.

Main Results:

  • Presented 21 optimized fiber designs offering large mode area and high beam quality.
  • Achieved a mode area exceeding 880 μm², comparable to photonic crystal fibers.
  • Demonstrated maintained single-mode, single-polarization operation across a wide range of parameters, even under bending.

Conclusions:

  • The proposed multicore fiber designs show significant potential for efficient fiber laser and amplifier applications.
  • Optimized stress-applying parts in multicore fibers enable simultaneous LMA and high beam quality.
  • These fibers offer robust performance, crucial for practical implementation in laser systems.