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设计一种新型光子晶体光纤,可在300 nm带宽范围内实现近零超平坦色散特性.光纤端面上所有空气孔按照通常的三角形规则均匀排列,中央位置十三个排列成雪花形的空气孔小于其它空气孔,这些孔共同构成光纤的纤芯.这类晶芯型光子晶体光纤与传统光子晶体光纤相比具有较大的模场面积,尤其是,通过最佳化匹配晶芯和包层中的空气孔大小可以在300 nm带宽范围内实现超平坦化色散特性,甚至可得到近零色散的平坦化色散曲线。尽管光纤的晶芯为雪花状,但近场很快会演化为类高斯型场分布.
A new type of photonic crystal fiber is designed to achieve near-zero ultra-flat dispersion over a bandwidth of 300 nm. All the air holes on the fiber end face are uniformly arranged according to the usual triangle rule. Thirteen air holes arranged in the shape of a snowflake in the central position are smaller than Other air holes, which together form the core of the optical fiber. Such a core-type photonic crystal fiber has a larger mode field area compared to the conventional photonic crystal fiber. In particular, by optimizing the matching of the core and the cladding The air-hole size allows for super-planar dispersion over a 300-nm bandwidth and even near-zero dispersion flattened dispersion curves. Although the core of the fiber is snowflake-like, the near-field will soon evolve into a Gaussian-like field distribution.