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 NameAffiliation
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.
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