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Non-Hermitian Mode Cleaning in Periodically Modulated Multimode Fibers.

Mohammad Nayeem Akhter1, Salim B Ivars1, Muriel Botey1

  • 1Universitat Politecnica Catalunya, Dep. de Fisica, Rambla Sant Nebridi 22, 08222, Terrassa (Barcelona), Spain.

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This summary is machine-generated.

Simultaneous modulation of fiber properties enables unidirectional coupling, controlling higher-order mode excitation. This technique can achieve effective mode cleaning for single-mode, spatially coherent output.

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Area of Science:

  • Optics and Photonics
  • Wave Propagation in Optical Fibers

Background:

  • Graded-index multimode fibers (GRIN-MMF) typically support multiple transverse modes, leading to signal degradation.
  • Controlling mode coupling is crucial for achieving high-quality optical transmission.

Purpose of the Study:

  • To investigate the effect of simultaneous modulation of propagation constant and gain/loss on mode coupling in GRIN-MMF.
  • To demonstrate a method for controlling higher-order transverse mode excitation and achieving mode cleaning.

Main Methods:

  • Semi-analytical prediction using a Gaussian beam approximation.
  • Numerical verification by solving the wave propagation equation with a non-Hermitian modulated potential.

Main Results:

  • Simultaneous modulation induces unidirectional coupling among fiber modes.
  • The modulation parameters determine whether higher-order mode excitation is enhanced or reduced.
  • Effective mode cleaning, leading to single-mode output, is predicted under specific modulation conditions.

Conclusions:

  • The proposed modulation technique offers a novel approach to control mode behavior in multimode fibers.
  • This method has the potential for applications requiring high-quality, spatially coherent optical output.