Li Xuyou, Xu Zhenlong, Ling Weiwei, Liu Pan
Appl Opt. 2014 Oct 10;53(29):6682-7. doi: 10.1364/AO.53.006682.
A novel (to our knowledge) type of photonic crystal fiber (PCF) with high nonlinearity and flattened dispersion is proposed. The propagation characteristics of chromatic dispersion, effective area, and nonlinearity are studied numerically by using the full-vector finite element method. Several PCF designs with high nonlinearity and nearly zero flattened dispersion or broadband flattened, and even ultraflattened, dispersion over different wavelength bands are obtained by optimizing the structural parameters. One optimized PCF has a nearly zero ultraflattened dispersion of 2.3 ps/(nm·km) with a dispersion variation of 0.2 ps/(nm·km) over the C+L+U wavelength bands. In addition, the dispersion slope and nonlinear coefficient at 1.55 μm can be up to 2.2×10(-3) ps/nm(2)·km and 33.2 W(-1)·km(-1), respectively. The designs proposed in this paper have bright prospects for applications in all-optical format conversion, supercontinuum generation, optical wavelength conversion, and many other fields.
提出了一种（据我们所知）新型的具有高非线性和色散平坦特性的光子晶体光纤（PCF）。采用全矢量有限元方法对色散、有效面积和非线性等传输特性进行了数值研究。通过优化结构参数，获得了几种在不同波长波段具有高非线性和近零色散平坦或宽带色散平坦甚至超平坦色散的光子晶体光纤设计。一种优化后的光子晶体光纤在C + L + U波长波段具有近零的超平坦色散，为2.3 ps/(nm·km)，色散变化为0.2 ps/(nm·km)。此外，在1.55μm处的色散斜率和非线性系数分别可达2.2×10(-3) ps/nm(2)·km和33.2 W(-1)·km(-1)。本文提出的设计在全光格式转换、超连续谱产生、光波长转换等众多领域具有广阔的应用前景。
