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Higher-order mode suppression in twisted single-ring hollow-core photonic crystal fibers

机译:扭曲单环空心芯光子晶体纤维高阶模式抑制

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摘要

A hollow-core single-ring photonic crystal fiber (SR-PCF) consists of a ring of capillaries arranged around a central hollow core. Spinning the preform during drawing introduces a continuous helical twist, offering a novel means of controlling the modal properties of hollow-core SR-PCF. For example, twisting geometrically increases the effective axial propagation constant of the LP01-like modes of the capillaries, providing a means of optimizing the suppression of HOMs, which occurs when the LP11-like core mode phase-matches to the LP01-like modes of the surrounding capillaries. (In a straight fiber, optimum suppression occurs for a capillary-to-core diameter ratio d/D = 0.682.) Twisting also introduces circular birefringence (to be studied in a future Letter) and has a remarkable effect on the transverse intensity profiles of the higher-order core modes, forcing the two-lobed LP11-like mode in the untwisted fiber to become three-fold symmetric in the twisted case. These phenomena are explored by means of extensive numerical modeling, an analytical model, and a series of experiments. Prism-assisted side-coupling is used to measure the losses, refractive indices, and near-field patterns of individual fiber modes in both the straight and twisted cases. (C) 2017 Optical Society of America
机译:空心芯单环光子晶体纤维(SR-PCF)由围绕中心空心芯布置的毛细管环组成。在绘图期间旋转预制件引入了连续的螺旋扭曲,提供了一种控制空心核心SR-PCF的模态特性的新方法。例如,扭曲几何上的毛细管的LP01样模式的有效轴向传播常数,提供了优化HOMS抑制的方法,这在LP11样核模式相位与LP01的方式相匹配时发生周围的毛细血管。 (在直纤维中,发生最佳抑制,用于毛细管 - 芯直径比D / D = 0.682。)扭曲还引入圆形双折射(在未来的字母中进行研究),对横向强度谱具有显着影响高阶核心模式,迫使两个亮的LP11样模式在未驾驶光纤中变成三倍对称的扭曲壳体。通过广泛的数值模型,分析模型和一系列实验探索这些现象。棱镜辅助侧耦合用于测量直线和扭曲壳体中各个纤维模式的损耗,折射率和近场模式。 (c)2017年光学学会

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  • 来源
    《Optics Letters》 |2017年第11期|共4页
  • 作者单位

    Max Planck Inst Sci Light Staudtstr 2 D-91058 Erlangen Germany;

    Max Planck Inst Sci Light Staudtstr 2 D-91058 Erlangen Germany;

    Max Planck Inst Sci Light Staudtstr 2 D-91058 Erlangen Germany;

    Max Planck Inst Sci Light Staudtstr 2 D-91058 Erlangen Germany;

    Max Planck Inst Sci Light Staudtstr 2 D-91058 Erlangen Germany;

    Max Planck Inst Sci Light Staudtstr 2 D-91058 Erlangen Germany;

    Max Planck Inst Sci Light Staudtstr 2 D-91058 Erlangen Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
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