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Gain equalization for a six-mode-group Er-doped fiber amplifier

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Abstract

We theoretically present a method for equalizing modal gain in a six-LP-mode erbium-doped fiber amplifier by combing two sections of erbium-doped fibers (EDFs) with different doping profiles. In the two EDFs, the dopant distributions are designed to be spatially mismatched to mainly support the optical amplification of different spatial modes. The optimum fiber designs have been found by employing genetic algorithm optimization when pumped by LP11 mode, resulting in less than 1.0 dB DMG over 25 nm bandwidth in the C-band for the six-LP signal modes. In addition, tolerance study of various fiber parameters has been carried out theoretically to assess fabrication challenge in realizing a desirable amplification performance.

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Acknowledgements

This work has been supported by the National Natural Science Foundation of China (under Grant No. 61665001), Guangxi Key Laboratory of Automatic Detecting Technology and Instruments (under Grant No. YQ17115), Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing (under Grant No. PF18181X), and Guangxi Experiment Center of Information Science (Guilin University of Electronic Technology, under Grant No. 20130328).

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Authors and Affiliations

  1. Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronic Technology, Guilin, 541004, China

    Shaohua Xu & Wentao Zhang

  2. Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin, 541004, China

    Zujun Qin

  3. Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin, 541004, China

    Wentao Zhang & Zujun Qin

  4. Guangxi Engineering Technology Research Center for Road Intelligent Transportation System, Guangxi Transportation Research and Consulting CO., LTD, Nanning, 530007, China

    Shaohua Xu

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  1. Shaohua Xu
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Correspondence to Zujun Qin.

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Xu, S., Zhang, W. & Qin, Z. Gain equalization for a six-mode-group Er-doped fiber amplifier. Opt Quant Electron 52, 20 (2020). https://doi.org/10.1007/s11082-019-2136-x

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