C_(6v)对称PBG-PCF空气纤芯半径对基模色散影响研究

Influence of air fibre core radius of PBG-PCF with six-fold rotation symmetry(C_(6v))on the dispersion of fundamental mode

用多极方法数值研究构成六重对称带隙导光型光子晶体光纤纤芯半径对基模色散的影响,数值结果表明纤芯半径越大基模幅值越小。在基模可能存在的入射波长范围内,低波长段基模色散为负值且线性增加,高波长段色散随入射波长在零色散附近振荡变化,较大纤芯半径时色散都是正值且在零色散以上做随入射波长振荡变化。

The effect of fiber core radius of PBG-PCF with six-fold rotation symmetry（C6v）on dispersion fundamental mode is studied numerically by multi-pole method.The numerical results indicate that the larger the air fiber core radius is,the smaller the amplitude of fundamental mode is.In incident wavelength range where fundamental mode possibly exists,the dispersion value of the fundamental mode is negative and it linearly increases in short wavelength part.Dispersion value of the fundamental mode fluctuates around zero in long wavelength part.