The study presents a novel design of multiring delivery fiber with large mode area for high power. Using a FiberCAD method, we investigated a fiber whose core is surrounded by alternative low- and high-index rings. Based on our calculation, the effective area is 400 μm~2 at 1.08 μm, larger than the ～280 μm~2 of conventional step-index fiber (20/400). The macrobending loss at 1.08 μm is estimated to be 1 × 10~(-3) dB/m, approximately one-third that of conventional step-index fiber (20/400). The single-mode operation can be achieved by the macrobending loss contrast between the fundamental mode (<1 dB/m) and high-order mode (>100 dB/m). The results indicate that multiring delivery fiber fabricated by modified chemical vapor deposition process is a promising candidate for high-power transmission.
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机译：该研究提出了一种具有大模面积的大功率多环传输光纤的新颖设计。使用FiberCAD方法，我们研究了一种光纤，其纤芯被替代的低折射率和高折射率环包围。根据我们的计算，有效面积为1.08μm时为400μm〜2，比常规阶跃折射率光纤（20/400）的〜280μm〜2大。在1.08μm处的宏弯损耗估计为1×10〜（-3）dB / m，约为传统阶跃折射率光纤（20/400）的三分之一。单模操作可以通过基本模式（<1 dB / m）和高阶模式（> 100 dB / m）之间的宏弯损耗对比来实现。结果表明，通过改进的化学气相沉积工艺制造的多环传输光纤是高功率传输的有希望的候选者。
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