LIU Yan,LI Yang,LIWei-dong.LP01 to LP11 mode convertor based on side-polished small-core single-mode fiber[J].Optoelectronics Letters,2018,14(2):88-91 LP01 to LP11 mode convertor based on side-polished small-core single-mode fiber Author Name Affiliation LIU Yan  Key Lab of All Optical Network & Advanced Telecommunication Network, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China  LI Yang  Key Lab of All Optical Network & Advanced Telecommunication Network, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China  LIWei-dong  Key Lab of All Optical Network & Advanced Telecommunication Network, Ministry of Education, 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 conversion efficiency greater than 95%. The effective mode area and coupling loss are also characterized in detail by finite element method (FEM). Hits: 3666 Download times: 0 View Full Text    Download reader