利用非对称微屏蔽线实现了一种新型结构铌酸锂光波导调制．并将传统中用于鳍线、微带线的谱域导抗法推广运用到这种以各向异性介质——铌酸锂为基底的半封闭的传输线中，分析、计算了该结构的色散特性、半波电压和调制带宽．结果表明，利用该结构实现电光行波调制器可以在很宽的频带内有效地减小调制器的速度失配，增加了调制带宽，是一种可行的方案． A Novel Structure LiNbO3 Optical Waveguide Modulation Using Asymmetrical Micro Shielding Wire. In the traditional semi-closed transmission line based on the anisotropic medium - lithium niobate, the traditional method of conducting the domain-guided method for the fin and microstrip lines is analyzed and calculated. The dispersion of the structure Characteristics, half-wave voltage and modulation bandwidth. The results show that using this structure to achieve electro-optical wave-front modulator can effectively reduce the modulator’s speed mismatch and increase the modulation bandwidth over a wide frequency band, which is a feasible solution.