In this paper, we proposed a broadband near-zero dispersion fiber based on a low-loss ZBLAN material. The dispersion variation is 2.1 ps · nm −1 km −1 in the wavelength range of 1700 nm to 3870 nm. The coherent supercontinuum (SC) is numerically investigated by using the proposed photonic crystal fiber. Then, we proposed an effective method to improve the SC conversion efficiency (CE) for mid-infrared region. By slightly adjusting the fiber structure parameters and pump wavelength, CE increased from 35.77% to 75.22%. Furthermore, such fiber can be a promising platform for frequency comb generation with a passive ring geometry. Smooth comb which corresponding to the single Kerr soliton is predicted at 2 μ m.

中文翻译：

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扁平近零色散光纤有效产生中红外超连续谱和腔孤子的数值研究

在本文中，我们提出了一种基于低损耗ZBLAN材料的宽带接近零色散光纤。在1700nm至3870nm的波长范围内，色散变化为2.1ps·nm -1 km -1。通过使用所提出的光子晶体光纤，对相干超连续谱（SC）进行了数值研究。然后，我们提出了一种有效的方法来提高中红外区域的SC转换效率（CE）。通过略微调整纤维结构参数和泵浦波长，CE从35.77％提高至75.22％。此外，这种光纤可以成为具有无源环几何形状的频率梳产生的有前途的平台。预测与单个Kerr孤子相对应的平滑梳为2μm。