High birefringence low-dispersion of nonlinear photonic crystal fiber

The paper presents a theoretical design of high nonlinear photonic crystal fiber (PCF) with high birefringence and low dispersion. Its birefringence, dispersion and nonlinear coefficient are investigated simultaneously by using the full vectorial finite element method with anisotropic perfectly matched layers. Numerical results show that the proposed highly nonlinear low-dispersion fiber has a total dispersion as low as ±12.6 ps km−1 nm−1 over ultrabroad wavelength range from 1.21 to 1.61 μm, and the corresponding birefringence and nonlinear coefficient are about 2.1 × 10−3 and 28 W−1 km−1 at 1.55 μm, respectively. The proposed PCF with high birefringence, low dispersion and high nonlinearity can have important application in supercontinuum (SC) generation, dispersion compensation, wavelength (frequency) converter, polarization maintaining transmission and Raman amplifier.