Design, fabrication, and characterization of a low-index center and trench-assisted 7-ring-core 5-mode-group fiber for dense space-division multiplexing

Zhuo Wang, Quanchao Lu, Jiajing Tu, Qinghua Xiao, Lei Shen, Xiaobo Lan, Zhaohui Li, Changyuan Yu, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

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 (MG2,1, MG3,1, and MG4,1) are verified to be in a weak-coupling state (crosstalk of which are less than −12 dB) over a transmission length of 23 km.

Original languageEnglish
Pages (from-to)650-663
Number of pages14
JournalOptics Express
Volume30
Issue number1
DOIs
Publication statusPublished - 3 Jan 2022

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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