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对正常型和反转极化型LiNbO3 波导在任意方向加电场 ,由线性电光效应引起的折射率的变化做了计算分析 ,结果发现只有在z方向加电场 ,LiNbO3 两波导臂折射率的变化才是完全相反的。实验验证得到了同样结论。提出一种利用反转技术、厚电极制作和脊型结构的新型宽带低啁啾的LiNbO3 调制器。计算结果表明 ,在实现光波和微波速度匹配情况下 ,当器件的微波损耗系数为 0 .15dB/ (cm·GHz) ,以及正常型和反转极化型LiNbO3 波导长度相等时 ,其频率啁啾参数非常小 ,4 0GHz时约为 0 .1。
The normal and reverse polarization LiNbO3 waveguides in any direction plus electric field, linear electro-optical effect caused by the refractive index changes were calculated and found that only in the z direction plus electric field, LiNbO3 two waveguides refractive index change Is exactly the opposite. The same conclusion is obtained by experimental verification. A novel broadband low chirp LiNbO3 modulator using inversion technique, thick electrode fabrication and ridge structure is proposed. The calculated results show that when the microwave loss coefficient of the device is 0.15 dB / (cm · GHz) and the length of the normal and reverse-polarized LiNbO3 waveguide are equal, the frequency chirp The parameters are very small, about 0 .1 at 4 0 GHz.