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

Yan Liu , Yang Li , Wei-dong Li

Optoelectronics Letters ›› : 88 -91.

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Optoelectronics Letters ›› : 88 -91. DOI: 10.1007/s11801-018-7234-7
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LP01 to LP11 mode convertor based on side-polished small-core single-mode fiber

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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).

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Yan Liu, Yang Li, Wei-dong Li. LP01 to LP11 mode convertor based on side-polished small-core single-mode fiber. Optoelectronics Letters 88-91 DOI:10.1007/s11801-018-7234-7

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