Low-flattened dispersion photonic crystal fiber with high birefringence and low effective mode area

A low-flattened index-guiding photonic crystal fiber (PCF) with high birefringence and low effective mode area is proposed. Elliptical air-holes with different diameters are distributed on the squeezed lattice. With the supercell lattice method, we simulate numerically the dispersion property and the birefringence property of the fundamental modes in this PCF. Simulation results show that the proposed PCF has a total dispersion as low as 0 +/- 1(ps /nm/km) over ultra-broad wavelength band from1.3 ae m to1.6 ae m. Meanwhile, the birefringence can be reached the order of 10(-3) and the low effective mode area is also obtained. Moreover, the influences on the birefringence and dispersion by geometrical parameters have also been discussed in detail.