Highly Nonlinear Dispersion-Flattened Photonic Crystal Fiber with High Birefringence

We present a theoretical design of highly nonlinear dispersion-flattened photonic crystal fiber with high birefringence. The full-vector finite element method with anisotropic perfectly matched layers is used to investigate the guiding properties. Numerical results show that the dispersion variation is within 0 +/- 0.97 ps.km(-1).nm(-1) in the C+L+U band, and the corresponding nonlinear coefficient and birefringence are about 72.4 W-1.km(-1) and 3.3 x 10(-3) at 1.55 mu m, respectively. The ultra-flattened dispersion feature, as well as the high nonlinearity coefficient and high birefringence are the main advantages of the proposed PCF structure, making it suitable as a dispersion compensator, chromatic dispersion controller, or as candidate for nonlinear optical applications.