24 October 2017 Fiber up-tapering and down-tapering for low-loss coupling between anti-resonant hollow-core fiber and solid-core fiber
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Proceedings Volume 10457, AOPC 2017: Laser Components, Systems, and Applications; 104571I (2017) https://doi.org/10.1117/12.2284296
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China
Abstract
In this paper, we demonstrate a novel method for the low-loss coupling between solid-core multi-mode fibers (MMFs) and anti-resonant hollow-core fibers (AR-HCFs). The core/cladding diameter of the MMF is 50/125μm and the mode field diameter of the AR-HCFs are 33.3μm and 71.2μm of the ice-cream type AR-HCFs and the non-node type ARHCFs, respectively. In order to match the mode field diameters of these two specific AR-HCFs, the mode field diameter of the MMFs is increased or decreased by up-tapering or down-tapering the MMFs. Then, according to the principle of coupled fiber mode matching, the optimal diameter of tapered fiber for low-loss coupling is calculated. Based on beam propagation method, the calculated coupling losses without tapering process are 0.31dB and 0.89dB, respectively for a MMF-HCF-MMF structure of the ice-cream type AR-HCFs and the non-node type AR-HCFs. These values can be reduced to 0.096dB and 0.047dB when the outer diameters of the MMF are down-tapered to 116μm and up-tapered to 269μm, respectively. What’s more, these results can also be verified by existing experiments.
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Naiqian Zhang, Zefeng Wang, Xiaoming Xi, "Fiber up-tapering and down-tapering for low-loss coupling between anti-resonant hollow-core fiber and solid-core fiber", Proc. SPIE 10457, AOPC 2017: Laser Components, Systems, and Applications, 104571I (24 October 2017); doi: 10.1117/12.2284296; https://doi.org/10.1117/12.2284296
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