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In this paper,a new type of photonic crystal fiber with high birefringence is proposed and analyzed with a full-vector model based on the super-lattice and the plane-wave expansion model.Due to the two different sizes of the holes introduced into the cladding of the PCF,the fiber is two-fold rotational symmetry and appears to be with high birefringence.Numerical results demonstrate that a modal birefringence at wavelength 1.31 μm is 1.8×10~-3 in the PCF withΛ=2.55 μm, d_1/Λ=0.3and d_2/Λ=0.833. A near 200 nm SPSM region within the wavelength range from 1.4 μm to 1.6 μm is obtained.
In this paper, a new type of photonic crystal fiber with high birefringence is proposed and analyzed with a full-vector model based on the super-lattice and the plane-wave expansion model. Die to the two different sizes of the holes introduced into the cladding of the PCF, the fiber is two-fold rotational symmetry and appears to be with high birefringence. Numerical results demonstrate that a modal birefringence at wavelength 1.31 μm is 1.8 × 10 ~ -3 in the PCF with Λ = 2.55 μm, d_1 / Λ = 0.3 and d 2 / Λ = 0.833. A near 200 nm SPSM region within the wavelength range from 1.4 μm to 1.6 μm is obtained.