[논문]Localized Eigenmodes in a Triangular Multicore Hollow Optical Fiber for Space-division Multiplexing in C+L Band

Hong, Seongjin; Oh, Kyunghwan

doi:10.3807/copp.2018.2.3.226

Localized Eigenmodes in a Triangular Multicore Hollow Optical Fiber for Space-division Multiplexing in C+L Band 원문보기

Current optics and photonics, v.2 no.3, 2018년, pp.226 - 232

Hong, Seongjin (Institute of Physics and Applied Physics, Yonsei University) , Oh, Kyunghwan (Institute of Physics and Applied Physics, Yonsei University)

Abstract ▼ AI-Helper

We propose a triangular-multicore hollow optical fiber (TMC-HOF) design for uncoupled mode-division and space-division multiplexing. The TMC-HOF has three triangular cores, and each core has three modes: $LP_{01}$ and two split $LP_{11}$ modes. The asymmetric structure of the triangular core can split the $LP_{11}$ modes. Using the proposed structures, nine independent modes can propagate in a fiber. We use a fully vectorial finite-element method to estimate effective index, chromatic dispersion, differential group delay (DGD), and confinement loss by controlling the parameters of the TMC-HOF structure. We confirm that the proposed TMC-HOF shows flattened chromatic dispersion, low DGD, low confinement loss, low core-to-core crosstalk, and low crosstalk between adjacent modes. The proposed TMC-HOF can provide a common platform for MDM and SDM applications.

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제안 방법

In this study we focus on its asymmetric structure for split LP₁₁ modes, such that applying its unique, asymmetric triangular structure can break the circular symmetry of LP modes in a fiber and split the degenerate LP₁₁ mode into two. We further investigate the guiding properties of a TMC-HOF in the C+L bands by controlling its structural parameters.
To confirm that our proposed waveguide structure allows three-mode guidance when R = 33 μm at Δn = 0.5%, we carry out a numerical calculation of the effective indices of modes LP01, LP11a, and LP11b.
Using a fully vectorial finite-element method, we optimized the structural size of the designed TMC-HOF so that it can guide the three LP modes with Δneff greater than 10-4 in the C and L bands.
mode into two. We further investigate the guiding properties of a TMC-HOF in the C+L bands by controlling its structural parameters. Numerical modal analyses are performed using a fully vectorial finite-element method (FEM) with the perfectly matched layer (PML) boundary condition [20].

이론/모형

In reference to silica, the triangular core has an index difference Δn = 0.5%, the optical properties being calculated using the Sellmeier equation for GeO2-doped silica glass [21].
1(a). The cladding material is pure silica, the optical dispersion of which was calculated using the Sellmeier equation for vitreous silica glass. In reference to silica, the triangular core has an index difference Δn = 0.

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DOI : 10.3807/COPP.2018.2.3.226 [무료]
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