A new kind of polarization-independent and temperature-insensitive electro-optical modulator is presented by the aid of the relationship between the electro-optical coefficients of LiNbO_3 crystal. The modulator is comprised of two pieces of LiNbO_3 crystals, and a pair of collimators. The light propagation in the modulator is studied with the wave coupling theory of linear electro-optic effect. It demonstrates that the modulated output intensity doesn't depend on the polarization of incident light. Furthermore, it shows that the disturbance of the output intensity is less than 1.5% as the temperature variation is -20℃～60℃, and dI_0/dT is better than 0.000 2, which means that the modulator has a wonderful thermal stability.%利用LiNbO_3晶体电光系数之间的关系,提出一种全新的温度不敏感偏振无关电光调制器.该调制器采用2块LiNbO_3晶体紧密相贴的结构,2块晶体加同一横向电压,电极设计和制作相当简单,无偏振片,无偏振损耗.采用线性电光效应的耦合波理论对光在调制器中的传播进行研究,理论计算表明:光通过调制器后,其输出强度不依赖于入射光的偏振状态;另外,数值计算结果表明:当温度在-20℃到60℃之间变化时,调制器输出光强的扰动不超过1.5%.
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