Multiple-Ring-Core FM-EDF for Weakly-Coupled MDM Amplification With Low Differential Modal Gain

Recently weakly-coupled mode-division multiplexing (MDM) transmission systems and networks based on ultralow-modal-crosstalk few-mode fiber (FMF) have attracted much interest, for which optical amplification technologies with low modal crosstalk and two-dimension mode-wavelength gain flattening are...

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Bibliographic Details
Published inIEEE photonics journal Vol. 13; no. 1; pp. 1 - 11
Main Authors Zhu, Jinglong, Zuo, Mingqing, Yang, Yu, Ge, Dawei, Shen, Lei, Chen, Zhangyuan, He, Yongqi, Li, Juhao
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 01.02.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Amplification
Coupled modes
Crosstalk
Design techniques
Doped fibers
Doping
Erbium
Fabrication
few-mode Erbium-doped fiber amplifier
Indexes
Mode-division multiplexing
Multiplexing
Optical fiber amplifiers
Optical fiber cables
Optical fiber networks
weak coupling
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Summary:Recently weakly-coupled mode-division multiplexing (MDM) transmission systems and networks based on ultralow-modal-crosstalk few-mode fiber (FMF) have attracted much interest, for which optical amplification technologies with low modal crosstalk and two-dimension mode-wavelength gain flattening are highly desired. In this paper, we propose for the first time a design method for few-mode Erbium-doped fiber (FM-EDF) with multi-ring-core (MRC) structures of both index and Erbium doping, which has high compatibility with the transmission MRC-FMF and low differential modal gain (DMG) with simple pump injection requirement. By sharing the boundaries of ring areas for both index and Erbium doping, the design method also helps to reduce the complexity of preform fabrication. We show by simulation that at 1550-nm signal wavelength, a 6-mode MRC-EDF can achieve a minimum DMG of 0.35-dB with only LP 11 pump light injection and a 10-mode MRC-EDF can achieve a minimum DMG of 0.60-dB with LP 01 and LP 03 pump lights injection. Besides, the tolerance of DMG to the variation of fiber parameters induced by fabrication is analyzed. The proposed FM-EDF is beneficial for the practical applications of weakly-coupled MDM transmission systems and networks.
ISSN:1943-0655
1943-0655
1943-0647
DOI:10.1109/JPHOT.2021.3051455