设计了一种新型结构的光子晶体光纤, 建立了对应的数学模型并采用全矢量有限元法对该结构的模场强度、有效折射率、双折射、色散特性和限制损耗进行了分析。研究表明, 该光纤在1550nm处可以获得高达7.66×10-3的双折射和低至12ps/(nm·km)的色散值, 同时在800~1600nm波长范围内, 始终保持1.498×10-6dB/m以下的极低限制损耗, 可用于制造极低色散值的保偏光纤。

A new high birefringence photonic crystal fiber (PCF) was designed. The properties of mode field, effective refractive index, birefringence dispersion and confinement loss were analyzed by the finite element method(FEM). Simulation results show that the proposed fiber obtains a birefringence of 7.66×10-3 and an ultra low dispersion of 12ps/(nm·km) at the wavelength of 1550nm, meanwhile the confinement loss keeps blow 1.498×10-6dB/m at the wavelength range of 800~1600nm. It can be used to make the polarization maintaining fiber with low dispersion.