Photonic Crystal Fiber with Snowflake Shape Crystal Core
雪花形晶芯光子晶体光纤

A novel photonic crystal fiber(PCF) with near zero ultra-flattened dispersion in the range of 300 nm broadband is demonstrated.All air holes are arranged in the section according to strict triangular regulation and identical spacing.Thirteen air holes in the middle of the section arrayed in the shape of snowflake,smaller than other air holes in the outer cladding region,form the larger crystal core of PCF.Obviously,this kind of photonic crystal fiber with snowflake crystal core(SCC-PCF) has large modal field area than conventional PCF as the thirteen air holes as a whole increase the core area greatly.Furthermore,dispersion curve is very flat and near zero dispersion can be obtained in the range of 300 nm broadband by optimally matching crystal core air holes size with cladding region.Resulting from the structure of core,modal field distribution is snowflake-like,but the output of near distance field distribution will evolve into Gaussian-like shape.