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Writing Bragg Gratings in Multicore Fibers
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Tunable mode control through myriad-mode fibers.

Sakshi Singh1, Simon Labouesse1, Rafael Piestun1

  • 1Department of Electrical, Computer, and Energy Engineering, University of Colorado Boulder, Colorado 80309, USA.

Journal of Lightwave Technology : a Joint IEEE/OSA Publication
|May 17, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a new technique for precise control over light modes in myriad-mode fibers. This method enables tailored light delivery for advanced applications like imaging and communication.

Keywords:
Multimode fibersmode controlwavefront shaping

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Area of Science:

  • Optics and Photonics
  • Fiber Optics
  • Wavefront Engineering

Background:

  • Multimode fibers (MMFs) are crucial for various applications, including imaging, communication, computation, and energy delivery.
  • Direct control over the mode composition in MMFs is challenging due to intermodal and polarization coupling.

Purpose of the Study:

  • To present a novel technique for tailoring the mode composition at the output of high-order-mode fibers.
  • To demonstrate precise control over thousands of optical modes within a fiber.

Main Methods:

  • Utilized the experimentally measured transmission matrix of a myriad-mode fiber (with 7140 modes).
  • Employed wavefront shaping to select specific subsets of modes.
  • Defined and applied efficiency and fidelity metrics to evaluate mode control.

Main Results:

  • Successfully demonstrated the ability to tailor mode composition in a high-order-mode fiber.
  • Created distinct focal spots at the fiber output by controlling mode subsets.
  • Established a relationship between control efficiency, fidelity, and the spatial location of output spots.

Conclusions:

  • The proposed technique offers precise mode control in high-order-mode fibers, surpassing limitations of conventional MMFs.
  • This method is particularly advantageous for fibers with a large number of modes, comparable to spatial light modulator capabilities.
  • The defined metrics provide a quantitative evaluation of mode control performance for future advancements.