21 spatial mode erbium-doped fiber amplifier for mode division multiplexing transmission

We experimentally demonstrate a 12-mode group (21 spatial mode) cladding-pumped few-mode erbium-doped fiber amplifier. The differential modal gain (DMG) is dramatically reduced by using the double cladding erbium-doped fiber (DC-EDF) with a refractive index trench structure, which helps to tightly c...

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Bibliographic Details
Published in:Optics letters 2018-04, Vol.43 (7), p.1550-1553
Main Authors: Zhang, Zhenzhen, Guo, Cheng, Cui, Liang, Mo, Qi, Zhao, Ningbo, Du, Cheng, Li, Xiaoying, Li, Guifang
Format: Article
Language:English
Subjects:
Amplification
Amplifiers
C band
Cladding
Core loss
Division
Doped fibers
Erbium
Fiber optic communications
Gain
Multiplexing
Refractivity
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Summary:We experimentally demonstrate a 12-mode group (21 spatial mode) cladding-pumped few-mode erbium-doped fiber amplifier. The differential modal gain (DMG) is dramatically reduced by using the double cladding erbium-doped fiber (DC-EDF) with a refractive index trench structure, which helps to tightly confine all 21 spatial modes in the core and to mitigate the bending loss. Our experimental results show that the DMG gain is about 3 dB when the average signal modal gain for all 12 mode groups is up to 15 dB across the C-band. Our method of using a DC-EDF with a properly designed trench structure can be used to develop gain equalized few-mode amplifiers supporting more spatial modes.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.43.001550