A Photonic crystal fiber with large effective refractive index separation and low dispersion

Abstract

A photonic crystal fiber (PCF) structure with a ring-core and 5 well-ordered semiellipse airholes has been creatively proposed. Through a comparison between the structures with a high refractive index (RI) ring-core and the structure without, it conclude that a PCF with a high RI ring-core can work better. Schott SF57 was elected as the substrate material of ringcore. This paper compares the effects of long-axis and short-axis changes on the PCF and selects the optimal solution. Especially TE 0,1 mode's dispersion is maintained between 0 and 3 ps / (nm � km) ranging from 1.45 μm to 1.65 μm. This property can be used to generate a supercontinuum with 200 μm long zero dispersion wavelength (ZDM). In addition, Δn eff reaches up to 10 −3 , which enables the near-degeneracy of the eigenmodes to be almost neglected. The proposed PCF structure will have great application value in the field of optical communications.