A new low-dispersion and large-effective-area PCF based on a fractal design

•A new kind of fractal photonic crystal fiber is proposed.•Dispersion and second order nonlinear effect are analyzed.•Large effective area and low dispersion values are obtained.•A comparison with normal photonic crystal fiber is presented.

In this paper we propose new structures of fractal photonic crystal fiber (F-PCF) based on modifications of second and third order Sierpinski fractal. These structures allow to confine the field in the center of the fiber without the need for a differentiated core. This property could be applied to obtain an increase of the effective area values and thereby reducing the nonlinear parameter. The values of the dispersion parameter for this structures are also analyzed.