铌酸锂电光调制器的温度特性研究

采用折射率椭球基本理论和数值计算方法,分析了纵向和横向调制下,出射光光强随温度的变化趋势,以及在这过程中与晶体折射率、晶体热膨胀系数及晶体尺寸间的关系,并进行了相应的数值模拟。结果表明,纵向调制下出射光光强随温度的变化趋势只跟晶体折射率的变化有关;横向调制下出射光光强随温度的变化趋势不仅要受到晶体折射率的影响,还要受到晶体尺寸及其膨胀系数的影响,因此可以利用特殊尺寸的晶体来提高电光调制器的温度稳定性。

The research on temperature propertiesof the LiNbO3 electro-optic modulator

By using the basic theory of the refractive indices ellipsoid and numerical calculation, the relationships of the tendency of change of the emitted light intensity with temperature, with the crystal refractive index, the crystal size, and the crystal expansion coefficient respectively, under the transverse and longitudinal modulation were simulated, and then carried out the appropriate numeri-cal calculation. The results show that the tendency of change of the emitted light intensity with temperature under the longitudinal modulation only can be affected by crystal refractive index. Not only the crystal refractive index but also the crystal size and its expan-sion coefficient can affect the tendency of change of the emitted light intensity with temperature under the transverse modulation. So the temperature stability can be improved by using crystal in specific size to present an optimal design of electro-optic modulator.