Journal
IEEE ACCESS
Volume 9, Issue -, Pages 75617-75625Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2021.3078504
Keywords
Orbital angular momentum; fiber optics; ring fiber; multiplexing
Categories
Funding
- National Key Research and Development Program of China [2019YFB1803700]
- Key Technologies Research and Development Program of Tianjin [20YFZCGX00440]
- Fundamental Research Funds for the Central Universities, Nankai University [63201178, 63191511]
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This paper proposes a Ge-doped air-core ring fiber for supporting a large amount of OAM modes in mode-division multiplexing in optical fiber communications. By adjusting fiber parameters, a fiber design supporting multiple OAM modes while maintaining single-mode condition is achieved.
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-mu m air core and a 1.5-mu 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 2 pi and 10-ps walk-off length in the air-core ring fiber with ellipticity or bending compared with low-order modes.
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