Journal
OPTICS EXPRESS
Volume 30, Issue 1, Pages 650-663Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.447823
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Funding
- National Key Research and Development Program of China [2019YFA0706300]
- National Natural Science Foundation of China [U1701661, U2001601]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X121]
- Guangzhou Basic and Applied Basic Research Foundation [202002030327]
- Key-Area Research and Development Program of Guangdong Province [2020B0101080002]
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An optimized design of 7-ring-core 5-mode-group fiber for mode-group-based dense space-division multiplexing (DSDM) is proposed. It is found that decreasing the refractive index of the center and trench of each ring core can increase the available ring-core thickness and suppress radial higher-order modes. The fabricated fiber exhibits low transmission losses and weak mode coupling, making it suitable for DSDM applications.
An optimized design of 7-ring-core 5-mode-group fiber for mode-group-based dense space-division multiplexing (DSDM) is proposed. It is found that decreasing the refractive index of the center and trench of each ring core can increase the available ring-core thickness and meanwhile suppress the radial higher-order modes. Based on the simulation, a fiber, with a thicker ring core and a relatively low refractive index contrast at the ring-core boundaries, is found of higher mode purity and lower macro-bending-caused mode coupling. In the experiment, the seven cores of the fabricated fiber have low transmission losses around -0.25 dB/km with only a few fluctuations. The three higher-order mode groups (MG(2,1), MG(3,1), and MG(4,1)) are verified to be in a weak-coupling state (crosstalk of which are less than -12 dB) over a transmission length of 23 km. (c) 2021 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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