高双折射低损耗条形纤芯光子晶体光纤设计

Design of high birefringence low loss bar core photonic crystal fiber

目前新型光子晶体光纤(photonic crystal fiber, PCF)在太赫兹波段(Terahertz, THz)内的研究不断深入,在满足高性能的同时也要保证较低的损耗,才能应用得更加广泛。针对0.9~1.4太赫兹波段,提出了一种具有高双折射、低色散、低损耗的光子晶体光纤,通过在纤芯包层中引入条形空气孔,形成不对称结构,提高特性,在0.9 THz~1.4 THz波段内进行特性研究。仿真结果显示,在1 THz时可达到0.076的双折射特性,同时最低可达到0.027 ps/(THz·cm)的近零平坦色散,限制损耗在1 THz时为10^(-9)dB/m数量级,有效模场面积为10^(-4)m^(2)数量级。

At present,the research of new photonic crystal fiber(PCF)in the terahertz band(Terahertz,THz)is deepening,and it is necessary to ensure low loss while satisfying high performance,so that it can be applied more widely.In this paper,a photonic crystal fiber with high birefringence,low dispersion and low loss is proposed for the 0.9 THz~1.4 THz band.By introducing bar core air holes in the core cladding,an asymmetric structure is formed and the characteristics are improved.The characteristic research is carried out in the 0.9~1.4 THz band.The simulation results show that the birefringence characteristic of 0.076 can be achieved at 1 THz,and the near-zero flat dispersion can be as low as 0.027 ps/(THz·cm).The confinement loss is in the order of 10^(-9) dB/m at 1 THz,and the effective mode field area is 10^(-4) m^(2) order of magnitude.