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[en] A novel elliptical core photonic crystal fiber (EC-PCF) is proposed with a trapezoidal outer cladding and three different inner claddings in this paper. The material of proposed fiber is a combination of the background material of silica and core material of As2S3. Using the finite element method (FEM) with the boundary condition of the circular perfectly matched layer (C-PML), the effect of different inner cladding structures (ellipse plus circles, strip circles, and hexagonal circles) on birefringence and nonlinear coefficients is analyzed. Simulation results show that the inner cladding has revealed a high birefringence in the order of 3.3136 × 10-1 with strip circles, while the nonlinear coefficients for x- and y-polarization is 2.81 × 104 w−1/km and 2.09 × 104 w−1/km at an operation wavelength of 1.55 μm, respectively. The demonstration of our proposed fiber can supply a feasible method for optical communication and supercontinuum generation.