OU Nanxian,LI Wei,QIU Runzhou,ZHANG Bin,GAO Shecheng,LIU Weiping.Amplification of high-order azimuthal mode based on a ring-core Yb-doped fiber[J].Optoelectronics Letters,2022,(4):222-226 Amplification of high-order azimuthal mode based on a ring-core Yb-doped fiber Author Name Affiliation OU Nanxian  Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China  LI Wei  Fiberhome Telecommunication Technologies Co., Ltd., Wuhan 430074, China  QIU Runzhou  Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China  ZHANG Bin  Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems and School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China  GAO Shecheng  Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China  LIU Weiping  Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China  Abstract:       In order to increase the number of amplified azimuthal modes in Yb-doped fiber (YDF), a multiple azimuthal modes amplifier based on a ring-core Yb-doped fiber (RC-YDF) was proposed and demonstrated. A home-made RC-YDF which can support 6 azimuthal mode groups was employed to amplify the signal mode at 1 064 nm, using a core pump scheme. The amplification characteristics of 5 high-orderazimuthal linear polarization (HA-LP) mode groups (LP11, LP21,LP31, LP41, LP51) were studied comprehensively. A more than 8 dB gain is obtained for each signal mode with 5 dBm input power, and the associated differential modal gain between all modes is less than 1 dB. The intensity profiles of all modes are stable and well preserved during the process of amplification. Hits: 413 Download times: 3 View Full Text    Download reader