Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Photonic Quasi-crystal Fiber for Orbital Angular Momentum Modes with Ultra-flat Dispersion

  • Kim, Myunghwan (Integrated Optics Laboratory, Advanced Photonics Research Institute, GIST) ;
  • Kim, Soeun (Integrated Optics Laboratory, Advanced Photonics Research Institute, GIST)
  • Received : 2019.04.30
  • Accepted : 2019.06.08
  • Published : 2019.08.25
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Abstract

We propose a photonic quasi-crystal fiber (PQF) for supporting up to 14 orbital angular momentum (OAM) modes with low and ultra-flat dispersion characteristics over the C+L bands. The designed PQF which consists of a large hollow center and quasi structural small air holes in the clad region exhibits low confinement losses and a large effective index separation (>$10^{-4}$) between the vector modes. This proposed fiber could potentially be exploited for mode division multiplexing and other OAM mode applications in fibers.

Keywords

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FIG. 2. (a) Effective indices of the eigenmodes and (b) the effective index difference between the same OAM mode orders as a function of wavelength.

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FIG. 1. Schematic of the proposed quasi-crystal fiber. The gray circles represent air holes. a is the distance between neighboring air holes and r0 to r6 are the radii of the air holes in the cladding region.

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FIG. 3. (a) Electric field intensity and (b) phase distribution of the HE3,1 (OAM2,1) mode.

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FIG. 4. (a) Dispersion of the eigenmodes as a function of wavelength, and enlarged dispersion of (b) HE2,1, (c) HE3,1, and EH1,1 modes. (d) The differential value of dispersion as a function of wavelength.

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FIG. 5. Confinement loss of the eigenmodes as a function of wavelength.

TABLE 1. Summary of the eigenmodes performances at 1.55 μm

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TABLE 2. Comparison of OAM mode performances

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