Osório Jonas H, Chafer Matthieu, Debord Benoît, Giovanardi Fabio, Cordier Martin, Maurel Martin, Delahaye Frédéric, Amrani Foued, Vincetti Luca, Gérôme Frédéric, Benabid Fetah
GPPMM Group, XLIM Research Institute, CNRS UMR 7252, University of Limoges, Limoges, France.
GLOphotonics S.A.S., 1 avenue d'Ester, Ester Technopôle, Limoges, France.
Sci Rep. 2019 Feb 4;9(1):1376. doi: 10.1038/s41598-018-37948-y.
Understanding cladding properties is crucial for designing microstructured optical fibers. This is particularly acute for Inhibited-Coupling guiding fibers because of the reliance of their core guidance on the core and cladding mode-field overlap integral. Consequently, careful planning of the fiber cladding parameters allows obtaining fibers with optimized characteristics such as low loss and broad transmission bandwidth. In this manuscript, we report on how one can tailor the modal properties of hollow-core photonic crystal fibers by adequately modifying the fiber cladding. We show that the alteration of the position of the tubular fibers cladding tubes can alter the loss hierarchy of the modes in these fibers, and exhibit salient polarization propriety. In this context, we present two fibers with different cladding structures which favor propagation of higher order core modes - namely LP and LP modes. Additionally, we provide discussions on mode transformations in these fibers and show that one can obtain uncommon intensity and polarization profiles at the fiber output. This allows the fiber to act as a mode intensity and polarization shaper. We envisage this novel concept can be useful for a variety of applications such as hollow core fiber based atom optics, atom-surface physics, sensing and nonlinear optics.
了解包层特性对于设计微结构光纤至关重要。对于抑制耦合型导光光纤而言，这一点尤为突出，因为其纤芯导光依赖于纤芯与包层模场重叠积分。因此，精心规划光纤包层参数能够获得具有诸如低损耗和宽传输带宽等优化特性的光纤。在本论文中，我们报告了如何通过适当修改光纤包层来调整空心光子晶体光纤的模式特性。我们表明，管状光纤包层管位置的改变能够改变这些光纤中模式的损耗等级，并展现出显著的偏振特性。在此背景下，我们展示了两种具有不同包层结构的光纤，它们有利于高阶纤芯模式（即LP和LP模式）的传播。此外，我们对这些光纤中的模式转换进行了讨论，并表明在光纤输出端能够获得不常见的强度和偏振分布。这使得光纤能够充当模式强度和偏振整形器。我们设想这一新颖概念可用于多种应用，如基于空心光纤的原子光学、原子表面物理、传感和非线性光学。
