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Analysis of optical fiber-based LP01 - LP02 mode converters for the O-, S-, and C-Band

机译：基于光纤的LP01 <-> LP02模式转换器的O，S和C波段分析

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This paper proposes a double fiber taper-based mode converter that converts LP01 to LP02 and vice versa. The first taper is used to convert LP01 to some higher order LP0m (m > 1) modes while the second taper suppresses the undesired higher order modes (m > 2) and results in LP02 overwhelmingly dominated. A simulation shows that conversion efficiency of almost 100% at the central wavelength of O-, S-, and C-Band, and above 98% over the S- and C-Band was achieved. Moreover, suppression of undesired higher order modes is more than 10 dB over the whole O-, S-, and C- Band. In particular, the suppression is more than 19 dB for the whole C-Band. The analysis also shows that the performance of the mode converter is not sensitive to slight variations of the converter's parameters. The same converter also can be used to convert LP02 back to LP01. It is shown that conversion efficiency higher than 99% and suppression of undesired higher order modes higher than 30 dB can be obtained. Further, a (de) multiplexer for an LP02 and an LP01 mode was designed using the mode converter combined with a symmetric directional coupler. The multiplexer is broadband and has an insertion loss less than 0.5 dB in the C-Band. (C) 2015 Optical Society of America
机译：本文提出了一种基于双光纤锥度的模式转换器，该转换器将LP01转换为LP02，反之亦然。第一个锥度用于将LP01转换为某些高阶LP0m（m> 1）模式，而第二个锥度抑制不希望的高阶模式（m> 2）并导致LP02压倒性地占据主导地位。仿真显示，在O波段，S波段和C波段的中心波长处，转换效率几乎达到100％，在S波段和C波段之上达到98％以上。此外，在整个O波段，S波段和C波段上，对不希望的高阶模的抑制超过10 dB。特别是，整个C频段的抑制超过19 dB。分析还表明，模式转换器的性能对转换器参数的微小变化不敏感。同一转换器还可以用于将LP02转换回LP01。结果表明，可以获得高于99％的转换效率和高于30 dB的不希望的高阶模态抑制。此外，使用与对称定向耦合器组合的模式转换器设计了用于LP02和LP01模式的（多路复用器）。多路复用器是宽带的，在C波段的插入损耗小于0.5 dB。 （C）2015年美国眼镜学会

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