Journal
OPTICS EXPRESS
Volume 27, Issue 26, Pages 38087-38097Publisher
Optica Publishing Group
DOI: 10.1364/OE.27.038087
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Funding
- National Key R&D Program of China [2018YFB1801803]
- National Natural Science Foundation of China [61761130082, 11574001, 11774116]
- Royal Society-Newton Advanced Fellowship
- National Program for Support of Top-notch Young Professionals
- Yangtze River Excellent Young Scholars Program
- Natural Science Foundation of Hubei Province of China [2018CFA048]
- Key R&D Program of Guangdong Province [2018B030325002]
- Open Fund of IPOC (BUPT) [IPOC2018A002]
- Program for HUST Academic Frontier Youth Team [2016QYTD05]
- Fundamental Research Funds for the Central Universities [2019kfyRCPY037]
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We theoretically propose two orbital angular momentum (OAM) erbium-doped ring-core fiber (RCF) amplifiers capable of providing relatively uniform gain for 22 modes with 18 OAM ones over the C-band. Two schemes of doping profile are discussed, one with single layer erbium doping and the other with double layer erbium doping. Theoretical analyses and numerical simulations suggest that the proposed first OAM erbium-doped fiber amplifier (OAM-EDFA) can obtain a gain larger than 20 dB for all 22 modes with differential modal gain (DMG) lower than 0.71 dB. The second OAM-EDFA performs better and can provide a larger gain over 21.5 dB for all 22 modes, with a smaller DMG below 0.27 dB and the noise figure (NF) lower than 3.9 dB over the whole C band. The presented OAM-EDFA may open up new perspectives for long-distance transmission in capacity scaling fiber-optic communications using OAM modes. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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