Quantifying the Coupling and Degeneracy of OAM Modes in High-Index-Contrast Ring Core Fiber

Banawan, Mai; Wang, Lixian; LaRochelle, Sophie; Rusch, Leslie A.

doi:10.1109/jlt.2020.3030918

Cited by 21 publications

(14 citation statements)

References 29 publications

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“…Based on this theory, the coupling between OAM modes supported by the HEl+1 and EHl-1 modes has been investigated, which is of great significance. Mai Banawan et al proposed a coupling model based on numerical mode solver outputs of perturbation to quantify the coupling and degeneracy of OAM modes in OAM fibers [27]. However, the coupling between two OAM modes composed of the same vector modes has still not been analyzed, and the two types of coupling in the same OAM mode group cannot be simultaneously fully considered.…”

Section: Effects Of the Intramode-group Coupling Induced By The Elliptical Deformation Of Orbitalmentioning

confidence: 99%

Effects of the Intramode-Group Coupling Induced by the Elliptical Deformation of Orbital Angular Momentum Fibers

Zhang

et al. 2022

IEEE Photonics J.

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Based on the coupling mode theory and numerical simulation, intramode-group coupling in orbital angular momentum (OAM) fibers with elliptical deformation is analyzed in depth. The elliptical deformation not only introduces a time delay difference between even and odd modes of the same highorder vector mode but also destroys the structure of the high-order vector modes; the structural damage depends on the strength of the elliptical deformation. When the elliptical deformation is relatively small, the structural damage of high-order vector modes can be ignored and coupling can be thought as occurring only between two OAM modes composed of the same high-order vector mode. While the elliptical deformation becomes larger, the structural damage cannot be ignored, coupling appears among four OAM modes in the same OAM mode group, and the coupling between two OAM modes composed of the same high-order vector mode is more serious. The results will pave the way for the establishment of accurate propagation models and the optimization of the OAM fiber design.

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Section: Effects Of the Intramode-group Coupling Induced By The Elliptical Deformation Of Orbitalmentioning

confidence: 99%

Effects of the Intramode-Group Coupling Induced by the Elliptical Deformation of Orbital Angular Momentum Fibers

Zhang

et al. 2022

IEEE Photonics J.

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“…Here, we numerically investigate the OAM mode purity in the designed air-core fiber at the wavelength of 1550 nm, which is an important indicator to measure the stability of the supported OAM modes. The transverse components of the OAM modes in the cylindrical coordinates (r, ) can be written as [28], [43], [44], ± , ± = + ( ) ±̂± ± + ( ) ± ( + )̂∓ (3a)…”

Section: E Mode Puritymentioning

confidence: 99%

Air-Core Ring Fiber Guiding >400 Radially Fundamental OAM Modes Across S + C + L Bands

et al. 2021

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In this paper, we propose and design a Ge-doped air-core ring fiber, which can support a large amount of OAM modes for mode-division multiplexing (MDM) in optical fiber communications. By varying the mole fraction of GeO2 and adjusting the structure parameter, including the air-core radius and the GeO2-doped ring width, we investigate the influence of different fiber parameters on the total supported OAM mode number. The hollow silica fiber with a 50-m air core and a 1.5-m thickness of Ge-doped ring is designed in simulation to support fiber eigenmodes up to HE112,1 and EH107,1. This provides 436 OAM modes at 1550 nm while maintaining radially single mode condition. Moreover, it can support more than 400 radially fundamental OAM modes for the wavelength from 1460 nm to 1625 nm, covering entire S, C and L bands. The optical parameters of the guided OAM modes in the fiber are also numerically analyzed, including effect of material loss, optical field distribution, effective refractive index profile and chromatic dispersion, etc. The simulation results show that the higher-order OAM modes have longer 2π and 10-ps walk-off length in the air-core ring fiber with ellipticity or bending compared with low-order modes.INDEX TERMS Orbital angular momentum, fiber optics, ring fiber, multiplexing.

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“…Experimentally, the transmission of two OAM mode-group is demonstrated over a 50 km ring core fiber without the use of MIMO DSP [63]. Emerging papers considering the design of RCFs and the propagation demonstration of OAM modes through it that we should mentions [64,65].…”

Section: Ring Core Fibers (Rcfs)mentioning

confidence: 99%

OAM Modes in Optical Fibers for Next Generation Space Division Multiplexing (SDM) Systems

Rjeb¹,

Fathallah²,

Machhout³

2021

Fiber Optics - Technology and Applications

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Due to the renewed demand on data bandwidth imposed by the upcoming capacity crunch, optical communication (research and industry) community has oriented their effort to space division multiplexing (SDM) and particularly to mode division multiplexing (MDM). This is based on separate/independent and orthogonal spatial modes of optical fiber as data carriers along optical fiber. Orbital Angular Momentum (OAM) is one of the variants of MDM that showed promising features including the efficient enhancement of capacity transmission from Tbit to Pbit and substantial improvement of spectral efficiency up to hundreds (bs-1 Hz-1). In this chapter, we review the potentials of harnessing SDM as a promising solution for next generation global communications systems. We focus on different SDM approaches and we address specifically the MDM (different modes in optical fiber). Finally, we highlight the recent main works and achievements that have been conducted (in last decade) in OAM-MDM over optical fibers. We focus on main R&D activities incorporating specialty fibers that have been proposed, designed and demonstrating in order to handle appropriates OAM modes.

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Quantifying the Coupling and Degeneracy of OAM Modes in High-Index-Contrast Ring Core Fiber

Cited by 21 publications

References 29 publications

Effects of the Intramode-Group Coupling Induced by the Elliptical Deformation of Orbital Angular Momentum Fibers

Effects of the Intramode-Group Coupling Induced by the Elliptical Deformation of Orbital Angular Momentum Fibers

Air-Core Ring Fiber Guiding >400 Radially Fundamental OAM Modes Across S + C + L Bands

OAM Modes in Optical Fibers for Next Generation Space Division Multiplexing (SDM) Systems

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