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设计了一种高双折射、低损耗的新型光子晶体光纤。基于全矢量有限元法,通过改变椭圆结构参量对该光子晶体光纤的有效折射率、双折射、色散、损耗和场特性进行分析。结果表明:改变椭圆率可以实现光纤在1300~1500nm范围内色散点的控制;当椭圆率为0.6时,该光纤在1550nm处可获得2.55×10~(-2)的高双折射,以及2.4×10~(-2) dB/km的低损耗;1300~1500nm范围内出现1个零色散点。此新型光纤的性能优于传统光纤,在光通信及光纤传感等领域有一定的应用前景。
A new type of photonic crystal fiber with high birefringence and low loss is designed. Based on the full vector finite element method, the effective refractive index, birefringence, dispersion, loss and field characteristics of the photonic crystal fiber are analyzed by changing the elliptical structure parameters. The results show that the ellipticity can be used to control the dispersion of the fiber in the range of 1300 ~ 1500 nm. When the ellipticity is 0.6, the fiber can obtain high birefringence of 2.55 × 10 -2 at 1550 nm and 2.4 × Low loss of 10 ~ (-2) dB / km; 1 zero-dispersion point appears in the range of 1300 ~ 1500nm. The performance of this new type of optical fiber is superior to that of traditional optical fiber and has certain application prospects in the fields of optical communication and optical fiber sensing.