Dr. Myunghwan Kim Profile

Dr. Myunghwan Kim

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Proceedings Article | 1 February 2019 Paper

Photonic quasicrystal fiber supporting orbital angular momentum modes

Myunghwan Kim, Chung Ghiu Lee, Soeun Kim

Proceedings Volume 10947, 1094704 (2019) https://doi.org/10.1117/12.2509699

KEYWORDS: Dispersion, Multiplexing, Cladding, L band, Silica, Finite element methods, Refractive index, Structured optical fibers, Integrated optics, Analytical research

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The orbital angular momentum (OAM) mode is considered as a new degree of freedom for mode division multiplexing (MDM) to overcome the increasing data capacity because of its orthogonality and theoretically unlimited number of OAM mode. Although OAM modes have been successfully demonstrated in free-space-based and conventional fibers, these have limited applications because of the gradual enlargement of these modes with propagation and small number of modes. In this paper, we propose a photonic quasi-crystal fiber (PQF) for supporting up to 38 orbital OAM mode with a flat dispersion characteristic over the C+L bands. We numerically investigated the eigenmodes in the proposed PQF and these effective indices, electric field intensity distributions, dispersion, and confinement loss. 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 many number of OAM modes, and satisfies a radially single mode condition and a large effective index separation (>10^-4) between the same order of the OAM modes. This proposed fiber could potentially be exploited for mode division multiplexing and other OAM mode applications in fibers.

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