Low-modal-crosstalk doped-fiber amplifiers in few-mode-fiber-based systems  

作　　者：SHUAILUO HUANG LEI SHEN GANG QIAO YUANPENG DING YUYANG GAO JIAN CUI BAOLONG ZHU SIYUAN LIU MINGQING ZUO JINGLONG ZHU LEI ZHANG JIE LUO YONGQI HE ZHANGYUAN CHEN JUHAO LI 

机构地区：[1]State Key Laboratory of Advanced Optical Communication Systems and Networks,Peking University,Beijing 100871,China [2]State Key Laboratory of Optical Fiber and Cable Manufacture Technology,Yangtze Optical Fibre and Cable Joint Stock Limited Company,Wuhan 430073,China [3]School of Computer and Communication Engineering,University of Science and Technology Beijing,Beijing 100083,China [4]Department of Networks,China Mobile Communications Group Co.,Ltd.,Beijing 100033,China [5]Department of Fundamental Network Technology,China Mobile Research Institute,Beijing 100053,China [6]Pengcheng Laboratory,Shenzhen 518055,China

出　　处：《Photonics Research》2024年第8期1768-1775,共8页光子学研究（英文版）

基　　金：Pengcheng Zili Project(PCL2023A04);National Natural Science Foundation of China(62101009,U20A20160)。

摘　　要：Independent light propagation through one or multiple modes is commonly considered as a basic demand for mode manipulation in few-mode fiber(FMF)-or multimode fiber(MMF)-based optical systems such as transmission links,optical fiber lasers,or distributed optical fiber sensors.However,the insertion of doped-fiber amplifiers always kills the entire effort by inducing significant modal crosstalk.In this paper,we propose the design of doped-fiber amplifiers in FMF-based systems adopting identical multiple-ring-core(MRC)index profiles for both passive and doped fibers to achieve low modal crosstalk.We develop the direct-glass-transition(DGT)modified chemical vapor deposition(MCVD)processing for precise fabrication of few-mode erbium-doped fibers(FM-EDFs)with MRC profiles of both refractive index and erbium-ion doping distribution.Then,a few-mode erbium-doped-fiber amplifier(FM-EDFA)with a maximum gain of 26.08 dB and differential modal gain(DMG)of 2.3 dB is realized based on fabricated FM-EDF matched with a transmission FMF supporting four linearly polarized(LP)modes.With the insertion of the FM-EDFA,60+60 km simultaneous LP_(01)∕LP_(11)∕LP_(21)∕LP_(02)transmission without inter-modal multiple-input multiple-output digital signal processing(MIMO-DSP)is successfully demonstrated.The proposed design of low-modal-crosstalk doped-fiber amplifiers provides,to our knowledge,new insights into mode manipulation methods in various applications.

关 键 词：FIBER CROSSTALK AMPLIFIERS 

分 类 号：TN253[电子电信—物理电子学] TN722