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Anti-Resonant Hollow Core Fibers with Modified Shape of the Core for the Better Optical Performance in the Visible Spectral Region—A Numerical Study

机译:具有改进的纤芯形状的抗谐振空心纤芯在可见光谱区域具有更好的光学性能—数值研究

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摘要

In this paper, we present numerical studies of several different structures of anti-resonant, hollow core optical fibers. The cladding of these fibers is based on the Kagomé lattice concept, with some of the core-surrounding lattice cells removed. This modification, by creating additional, glass-free regions around the core, results in a significant improvement of some important optical fiber parameters, such as confinement loss (CL), bending loss (BL), and dispersion parameter (D). According to the conducted simulations (with fused silica glass being the structure’s material), CL were reduced from ~0.36 dB/m to ~0.16 dB/m (at 760 nm wavelength) in case of the structure with removed cells, and did not exceed the value of 1 dB/m across the 700–850 nm wavelength range. Additionally, proposed structure exhibits a remarkably low value of D—from 1.5 to 2.5 ps/(nm × km) at the 700–800 nm wavelength range, while the BL were estimated to be below 0.25 dB/m for bending radius of ~1.5 cm. CL and D were simulated, additionally, for structures made of acrylic glass polymethylmethacrylate, (PMMA), with similarly good results—DPMMA ∊ [2, 4] ps/(nm × km) and CLPMMA ≈ 0.13 dB/m (down from 0.41 dB/m), for the same spectral regions (700–800 nm bandwidth for D, and 760 nm wavelength for CL).
机译:在本文中,我们介绍了抗谐振空心光纤的几种不同结构的数值研究。这些光纤的包层基于Kagomé晶格概念,其中除去了一些围绕芯的晶格单元。通过在纤芯周围创建额外的无玻璃区域,此修改可显着改善一些重要的光纤参数,例如限制损耗(CL),弯曲损耗(BL)和色散参数(D)。根据进行的模拟(使用熔融石英玻璃作为结构的材料),在去除单元的情况下,CL从〜0.36 dB / m降低至〜0.16 dB / m(在760 nm波长),并且不超过在700–850 nm波长范围内为1 dB / m。此外,拟议的结构在700-800 nm波长范围内的D值极低,为1.5至2.5 ps /(nm×km),而弯曲半径约为1.5时,BL估计低于0.25 dB / m。厘米。此外,对于由丙烯酸玻璃聚甲基丙烯酸甲酯(PMMA)制成的结构,还模拟了CL和D,具有类似的良好结果-DPMMA ∊ [2,4] ps /(nm×km)和CLPMMA≈0.13 dB / m(低于0.41) dB / m),适用于相同的光谱区域(D的带宽为700-800 nm,CL的波长为760 nm)。

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