提出一种基于空气孔填充的光子晶体光纤与普通单模光纤低损耗耦合方法,并通过光束传播法数值仿真的方式研究了填充物折射率以及填充长度等参数对耦合损耗的影响.结果表明,选择合适的填充参数可以大幅度降低光子晶体光纤与普通单模光纤间的耦合损耗,从而实现光子晶体光纤与普通单模光纤间的低损耗耦合.该方法可适用于多种光子晶体光纤与普通单模光纤之间的低损耗耦合,在光子晶体光纤与普通单模光纤的模场严重失配的情况下,该方法的优势更为明显.

A low-loss coupling between photonic crystal fibers and standard single-mode fibers based on air holes filling is proposed.The impacts of filling parameters on coupling loss between the two kinds of fibers is investigated by numerical simulations via beam propagation method.The results show that this method can greatly reduce the coupling loss between two kinds of fibers provided the filling parameters are selected appropriately.This method is usable for the coupling between a variety of photonic crystal fibers and single mode fibers especially for those with large mismatch of mode field diameters.