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In-fibre LP11–LP21 mode conversion using force-induced long-period fibre gratings with polarization controllers
Journal of Modern Optics ( IF 1.3 ) Pub Date : 2020-03-29 , DOI: 10.1080/09500340.2020.1759714
Hajime Sakata 1 , Wataru Onishi 1
Affiliation  

ABSTRACT Mode conversion between higher-order modes is attained in a step-index four mode fibre using an in-line polarization controller followed by a force-induced long period fibre grating. By adjusting the field orientation of the LP11 mode to the antisymmetric fibre grating, the LP11 mode is converted to the LP21 mode with a spatially periodic force of 50 N along the fibre length of 50 mm. The mode conversion is evaluated by observing the far-field and near-field patterns of the fibre output and by comparing the transmitted optical power with and without the additional two-mode fibre. The phase-matching grating period is required of the accuracy of roughly ±5 μm and the radiation loss during the mode conversion is as low as 0.01 dB.

中文翻译:

使用带偏振控制器的力诱导长周期光纤光栅进行光纤内 LP11-LP21 模式转换

摘要 高阶模式之间的模式转换是在阶跃折射率四模光纤中使用串联偏振控制器和力诱导长周期光纤光栅实现的。通过将 LP11 模式的场取向调整到反对称光纤光栅,LP11 模式转换为 LP21 模式,沿 50 mm 的光纤长度具有 50 N 的空间周期力。模式转换是通过观察光纤输出的远场和近场模式,并通过比较使用和不使用附加双模光纤的传输光功率来评估的。相位匹配光栅周期要求精度约为±5 μm,模式转换过程中的辐射损耗低至0.01 dB。
更新日期:2020-03-29
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