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

• 作者: 刘艳 李卫东 李阳
• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2018,（2）
• 页码范围: 88-91
• 页数: 4页
• 语种: 英文
• DOI: 10.1007/s11801-018-7234-7

摘要

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) .