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Optimization of the splice loss between photonic-bandgap fibers and conventional single-mode fibers

机译：优化光子带隙光纤与常规单模光纤之间的熔接损耗

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摘要

To understand the loss limitations of a splice between a hollow-core fiber and a conventional fiber, we use annumerical model to calculate the expected coupling loss between the NKT Photonics’ HC-1550-02 fiber and a single-nmode fiber (SMF) of arbitrary step-index profile. When the SMF parameters are optimized, the splice loss isnpredicted to be as low as ~0.6 dB. This minimum is believed to be largely due to mode-shape mismatch. Thesenpredictions are confirmed experimentally by optimizing the splice loss between this photonic-bandgap fibernand five SMFs with different mode-field diameters (MFDs) and V numbers. With the SMF-28 fiber, the measurednloss is 1:3 dB, in excellent agreement with theory. Using a SMF with parameters close to the optimum valuesn(MFD ¼ 7:2 μm and V ¼ 2:16), this loss was reduced to a new record value of 0:79 dB.
机译：为了了解空心光纤和常规光纤之间的接头的损耗限制，我们使用数值模型来计算NKT Photonics的HC-1550-02光纤与单模光纤（SMF）之间的预期耦合损耗。任意阶跃索引配置文件。当优化SMF参数时，预计熔接损耗可低至〜0.6 dB。认为该最小值主要是由于模式形状不匹配。通过优化此光子带隙光纤与五个具有不同模场直径（MFD）和V值的SMF之间的熔接损耗，可以通过实验确定该预测。使用SMF-28光纤，测得的损耗为1：3 dB，与理论非常吻合。使用参数接近最佳值n（MFD¼7：2μm和V¼2:16）的SMF，此损耗降低到0:79 dB的新记录值。

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