Highly nonlinear low-dispersion photonic crystal fiber with high birefringence for four-wave mixing

We proposed a new structure of highly nonlinear low-dispersion photonic crystal fiber with high birefringence for four-wave mixing. Its dispersion and nonlinear coefficient are investigated simultaneously by using the full-vector finite element method with anisotropic perfectly matched layers. Numerical results show that the dispersion variation is within ±0.7 ps km−1 nm−1 in the C band, and the corresponding nonlinear coefficient and birefringence are about 60.5 W−1 km−1 and 4.92 × 10−3 at 1.55 μm, respectively. The proposed PCF with low dispersion, high nonlinearity, and high birefringence can have important application in four-wave mixing.

► Nonlinear characteristics and dispersion characteristics can be controlled by adjusting its structure parameters. ► The dispersion variation is within ±0.7 ps km−1 nm−1 in the C band. ► The birefringence is 4.92 × 10−3 at 1.55 μm. ► The nonlinear coefficient of the optimized PCF is 60.5 W−1 km−1.