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提出一种高折射率材料80PbO·20Ga2O3(PG玻璃)中心填充椭圆芯光子晶体光纤.基于有限元法对光子晶体光纤的双折射特性和模场面积进行数值模拟,并研究了椭圆芯尺寸、椭圆率和孔间距等光纤几何参量对双折射特性的影响.数值研究表明:在1 550nm波长处,双折射高达1.256×10-1,x偏振和y偏振模场面积分别为0.43μm2和0.68μm2;在910nm~1931nm的宽波段范围内,双折射始终保持10-1量级.该光纤可以作为保偏光纤应用于偏振控制、相干通信和光纤传感系统.
A high refractive index material 80PbO · 20Ga2O3 (PG glass) center-filled elliptical core photonic crystal fiber is proposed.The birefringence properties and mode field area of photonic crystal fiber are numerically simulated based on the finite element method, and the effects of the elliptical core size, ellipse The results show that the birefringence is 1.256 × 10-1 at wavelength of 1 550 nm, the areas of x-polarization and y-polarization are 0.43μm2 and 0.68μm2, respectively. The birefringence is always on the order of 10-1 in the wide band from 910nm to 1931nm.The fiber can be used as polarization-maintaining, coherent communication and optical fiber sensing system as polarization maintaining fiber.