高非线性高双折射光子晶体光纤特性的理论研究

Theoretical Investigation of Photonic Crystal Fiber with Highly Nonlinear and Birefringent

基于全矢量有限元法,设计了一种新型零色散波长为1550nm的高非线性双折射光子晶体光纤(PCF),并分析了PCF的有效折射率、有效模面积、双折射、非线性系数以及色散特性。数值结果表明,当光纤包层孔间距Λ为1.6μm,大空气孔直径d1为1.4μm,小空气孔直径d2为0.74μm和0.76μm时,光纤的零色散波长都在1550nm处,该PCF的双折射为4.049×10-3,非线性系数可达28.4km-1·W-1。这种高非线性高双折射PCF,在1550nm通信波段具有非常广泛的应用前景。

According to the full-vector finite element method, a new highly nonlinear and birefringence photonic crystal fiber （PCF） with zero-dispersion at wavelength of 1550 nm is designed. The effective refractive index, effective mode area, birefringence, nonlinear coefficient and dispersion characteristics of the PCF are analyzed. Simulation results show that birefringence of the PCF is 4. 049×10-3, and nonlinear coefficient reaches 28.4 km-1 ·W-1 at wavelength of 1550 nm, which are obtained under the condition of cladding air hole pitch size of 1.6 μm, large air hole diameter of 1.4 μm and small air hole diameter of 0.74 μm and 0.76 μm respectively. The PCF has very broad prospect of application in 1550 nm communication band.