光电子快报(英文版), 2018, 14 (2): 88, Published Online: Sep. 17, 2018  

LP01 to LP11 mode convertor based on side-polishedsmall-core single-mode fiber

Author Affiliations
1 Key Lab of All Optical Network & Advanced Telecommunication Network, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
2 Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China
Abstract
An all-fiber LP01-LP11 mode convertor based on side-polished small-core single-mode fibers (SMFs) is numerically demonstrated. The linearly polarized incident beam in one arm experiences π shift through a fiber half waveplate, and the side-polished parts merge into an equivalent twin-core fiber (TCF) which spatially shapes the incident LP01 modes to the LP11 mode supported by the step-index few-mode fiber (FMF). Optimum conditions for the highest conversion efficiency are investigated using the beam propagation method (BPM) with an approximate efficiency as high as 96.7%. The proposed scheme can operate within a wide wavelength range from 1.3 μm to1.7 μm with overall conver-sion efficiency greater than 95%. The effective mode area and coupling loss are also characterized in detail by finite element method (FEM).

LIU Yan, LI Yang, LI Wei-dong. LP01 to LP11 mode convertor based on side-polishedsmall-core single-mode fiber[J]. 光电子快报(英文版), 2018, 14(2): 88.

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