Mode-dependent dynamic gain of all-fiber FM-EDFA under various pump manipulation  

作　　者：方翼鸿 张心怡 黄锡恒 曾研 许鸥 李建平 付松年 秦玉文 Yihong Fang;Xinyi Zhang;Xiheng Huang;Yan Zeng;Ou Xu;Jianping Li;Songnian Fu;Yuwen Qin(Institute of Advanced Photonics Technology,School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,China;Guangdong Provincial Key Laboratory of Information Photonics Technology,Guangdong University of Technology,Guangzhou 510006,China;Key Laboratory of Photonic Technology for Integrated Sensing and Communication,Ministry of Education,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]Institute of Advanced Photonics Technology,School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,China [2]Guangdong Provincial Key Laboratory of Information Photonics Technology,Guangdong University of Technology,Guangzhou 510006,China [3]Key Laboratory of Photonic Technology for Integrated Sensing and Communication,Ministry of Education,Guangdong University of Technology,Guangzhou 510006,China

出　　处：《Chinese Optics Letters》2024年第2期128-134,共7页中国光学快报（英文版）

基　　金：supported by the National Key R&D Program of China(No.2018YFB1800903);the National Natural Science Foundation of China(No.U22A2087);the Guangdong Introducing Innovative and Entrepreneurial Teams of the Pearl River Talent Recruitment Program(No.2021ZT09X044);the Guangdong Provincial Key Laboratory of Photonics Information Technology(No.2020B121201011)。

摘　　要：The dynamic gain of a few-mode erbium-doped fiber amplifier(FM-EDFA)is vital for the long-haul mode division multiplexing(MDM)transmission.Here,we investigate the mode-dependent dynamic gain of an FM-EDFA under various manipulations of the pump mode.First,we numerically calculate the gain variation with respect to the input signal power,where a modedependent saturation input power occurs under different pump modes.Even under the fixed intensity profile of the pump laser,the saturation input power of each spatial mode is different.Moreover,high-order mode pumping leads to a compression of the linear amplification region,even though it is beneficial for the mitigation of the differential modal gain(DMG)arising in all guided modes.Then,we develop an all-fiber 3-mode EDFA,where the fundamental mode of the pump laser can be efficiently converted to the LP_(11)mode using the all-fiber mode-selective coupler(MSC).In comparison with the traditional LP_(01)pumping scheme,the DMG at 1550 nm can be mitigated from 1.61 dB to 0.97 dB under the LP_(11)mode pumping,while both an average gain of 19.93 dB and a DMG of less than 1 dB can be achieved from 1530 nm to 1560 nm.However,the corresponding signal input saturation powers are reduced by 0.3 dB for the LP_(01)mode and 1.6 dB for the LP_(11)mode,respectively.Both theoretical and experimental results indicate that a trade-off occurs between the DMG mitigation and the extension of the linear amplification range when the intensity profile of pump laser is manipulated.

关 键 词：few-mode erbium-doped fiber amplifier differential modal gain saturation input power 

分 类 号：TN248[电子电信—物理电子学] TN722