空芯反谐振和光子带隙复合光纤的优化设计

Optimal design of hollow core anti resonant andphotonic bandgap hybrid fiber

空芯反谐振和光子带隙复合光纤是刚刚兴起的一种新型空芯微结构光纤。由于这种光纤可同时实现低损耗和单模传输的特点,所以可应用于光纤陀螺、光纤激光通信等领域。为了实现良好的单模性和低损耗,本文对此种光纤的基模和高阶模的限制和散射损耗进行了计算,通过优选光纤内包层气孔归一化内径d/D和内包层气孔壁厚度t,得到了当d/D=068,t=500nm时,在工作波长1500~1590nm范围,空芯反谐振和光子带隙复合光纤可实现良好的单模性和低损耗。

The hollow core anti resonant and photonic bandgap hybrid fiber is a new type of hollow core microstructure fiber which has just emerged recently.Due to this optical fiber can realize the characteristics of low loss and single mode transmission at the same time,so it can be used in fiber optic gyro,fiber laser communication and other fields.In order to achieve good single mode performance and low loss,the confinement and scattering losses of the fundamental and higher order modes of this kind of fiber are calculated in this paper.By optimizing the normalized inner diameter d/D of the inner cladding pore and the thickness t of inner cladding airhole,good single mode performance and low loss are achieved in the operating wavelength range 1500~1590 nm for d/D=0.68 and t=500 nm for hollow core anti resonant and photonic bandgap composite fibers.