【摘要】 利用等效介质结构,将圆形光子晶体光纤的二维光子晶体结构近似为一维结构,应用平面波法得到其能带结构.考虑实际Bragg光纤与圆形光子晶体光纤的共同之处,同样将其近似为一维光子晶体,得到能带结构,结果与以前直接的一维平面波法得到的能带结构存在细微差异.更多还原

【Abstract】 Utilizing the effective-medium structure,the two-dimensional lattice structure of circular PCF can be approximated to an one-dimensional structure,and the photonic band gaps can be calculated by the plane-wave expansion method.Considering the analogy between Bragg fiber and circular PCF,the band diagram of the Bragg fiber can be also obtained with one-dimensional approximation.There are slight differences between our results and the previous occasion.The complexity of the calculation can be reduced by using the effective medium structure and one dimensional approximation.更多还原