Ge-doped air-core ring fiber supporting >400 radially fundamental OAM modes across O, E, S, C, L bands

Yingning Wang; Wenqian Zhao; Yuxi Fang; Wenpu Geng; Changjing Bao; Zhi Wang; Hao Zhang; Hao Huang; Yongxiong Ren; Zhongqi Pan; Yang Yue

doi:10.1117/12.2575109

10 October 2020 Ge-doped air-core ring fiber supporting >400 radially fundamental OAM modes across O, E, S, C, L bands

Yingning Wang, Wenqian Zhao, Yuxi Fang, Wenpu Geng, Changjing Bao, Zhi Wang, Hao Zhang, Hao Huang, Yongxiong Ren, Zhongqi Pan, Yang Yue

Author Affiliations +

Proceedings Volume 11547, Optoelectronic Devices and Integration IX; 115471L (2020) https://doi.org/10.1117/12.2575109
Event: SPIE/COS Photonics Asia, 2020, Online Only

Conference Poster

Abstract

A pivotal issue of the conventional optical fiber communications networks is to meet the explosively increasing requirement in data traffic. In order to meet this ever-increasing demand, there have been a lot of research and industrial development efforts to utilize the photon in various dimensions such as wavelength division multiplexing (WDM), space division multiplexing (SDM), mode division multiplexing (MDM) and so on. Fueled by emerging bandwidth-hungry applications, orbital angular momentum (OAM) modes and their multiplexing have recently gained much attention due to its special doughnut-shaped intensity distribution, as well as its unique helical phase wavefront with the theoretically infinite topological value. The OAM modes with different topological charge values are orthogonal to each other, which has provided a new degree of freedom in MDM. In this paper, we propose and design a Ge-doped air-core ring fiber, which can support numerous OAM modes. By varying the mole fraction of GeO2 and adjusting the structure parameter, including the air-core radius and the GeO2-doped ring width, we study the influence of the different fiber parameters on the total supported OAM mode number. The hollow silica fiber with a 50-μm air core and a 1.5-μm thickness of Gedoped ring is designed in simulation to support fiber eigenmodes up to HE_112,1 and EH_107,1. This provides 436 OAM modes at 1550 nm while maintaining radially single mode condition. Moreover, it can support more than 400 OAM modes from 1260 nm to 1625 nm, covering O, E, S, C, and L bands.

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Yingning Wang, Wenqian Zhao, Yuxi Fang, Wenpu Geng, Changjing Bao, Zhi Wang, Hao Zhang, Hao Huang, Yongxiong Ren, Zhongqi Pan, and Yang Yue "Ge-doped air-core ring fiber supporting >400 radially fundamental OAM modes across O, E, S, C, L bands", Proc. SPIE 11547, Optoelectronic Devices and Integration IX, 115471L (10 October 2020); https://doi.org/10.1117/12.2575109

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