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Design of cladding rods-assisted depressed-core few-mode fibers with improved modal spacing

机译：具有改进模态间距的包层棒辅助压模低模数光纤设计

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摘要

This paper investigates the design details of cladding rods-assisted (CRA) depressed-core (DC) few-mode fibers (FMFs) that feature more equally spaced linearly polarized (LP) modal effective indices, suitable for high-spatialdensity weakly-coupled mode-division multiplexing systems. The influences of the index profile of cladding rods on LP mode-resolved effective index, bending sensitivity, and effective area A(eff), are numerically described. Based on the design considerations of LP modal A(eff)-dependent spatial efficiency and LP modal bending lossdependent robustness, the small LP21-LP02 and LP22-LP03 modal spacing limitations, encountered in state-of-theart weakly-coupled step-index FMFs, have been substantially improved by at least 25%. In addition, the proposed CRA DC FMFs also show sufficiently large effective areas (in excess of 110 mu m(2)) for all guided LP modes, which are expected to exhibit good nonlinear performance.
机译：本文研究了包层棒辅助（CRA）压芯（DC）少模光纤（FMF）的设计细节，这些光纤的特征在于更均匀分布的线性偏振（LP）模态有效指标，适用于高空间密度弱耦合模分复用系统。数值描述了包层棒的折射率分布对LP模式分辨的有效折射率，弯曲灵敏度和有效面积A（eff）的影响。基于对LP模态A（eff）依赖的空间效率和LP模态弯曲损耗依赖的鲁棒性的设计考虑，在最先进的弱耦合阶跃折射率FMF中遇到小的LP21-LP02和LP22-LP03模态间距限制，至少改善了25％。此外，对于所有引导的LP模式，建议的CRA DC FMF还显示出足够大的有效面积（超过110μm（2）），这有望表现出良好的非线性性能。

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