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Flexible generation/conversion/exchange of fiber-guided orbital angular momentum modes using helical gratings

机译:使用螺旋光栅灵活地生成/转换/交换光纤引导的轨道角动量模

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摘要

By exploiting helical gratings (HGs), we propose and simulate flexible generation, conversion, and exchange of fiber-guided orbital angular momentum (OAM) modes. HGs can enable the generation of OAM modes, and the OAM conversion between two arbitrary modes guided in fibers. A specific HG can exchange the OAM states of a couple of OAM modes, i.e., OAM exchange. In addition, a Fabry Perot (F-P) cavity cascaded with two identical reflective HGs can reflect converted OAM modes with a comb spectrum. The HG-based generation/conversion/exchange of OAM modes are dependent on helix period, orientation, and the fold number of helical fringes. The proposed method of generation, conversion, and exchange of fiber-guided OAM modes using HGs is flexible and well compatible with OAM fibers, featuring a high conversion efficiency close to 100% and a conversion bandwidth about 10 nm in transmission spectra, while less than 1 nm in reflection spectra. (C) 2015 Optical Society of America
机译:通过利用螺旋光栅(HGs),我们提出并模拟了光纤制导的轨道角动量(OAM)模式的灵活生成,转换和交换。 HG可以启用OAM模式的生成,以及在光纤中引导的两个任意模式之间进行OAM转换。特定的HG可以交换两种OAM模式的OAM状态,即OAM交换。此外,与两个相同的反射式HG级联的法布里珀罗(F-P)腔可以反射具有梳状光谱的转换OAM模式。基于HG的OAM模式的生成/转换/交换取决于螺旋周期,方向和螺旋条纹的折叠数。所提出的使用HG生成,转换和交换光纤引导的OAM模式的方法是灵活的,并且与OAM光纤很好地兼容,具有接近100%的高转换效率和透射光谱中约10 nm的转换带宽,而小于反射光谱为1 nm。 (C)2015年美国眼镜学会

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