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

【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）.更多还原

【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）.更多还原