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电场分布和直流漂移对多层电光聚合物调制器的器件稳定性和极化效率有着重要的影响 .本文由电磁场理论建立出等效电路模型 ,分析结果表明多层聚合物调制器的稳态直流场分布取决于材料的电特性 ;材料的弛豫时间常数τ(τ=ε/σ2 ,其中σ是电导率 ,ε是介电常数 )是最大程度上消除直流场弛豫的关键 .当外加直流电压时 ,波导层的场分布由初态到稳态指数变化 ,这一过程由波导层和覆盖层的弛豫时间差决定 .当两者相差为零时 ,弛豫消失 .但在实际工艺中很难作到这一点 ,为此 ,本文经过分析、模拟 ,提出一种简单的“自抑制”机制 ,能够很好地改善多层电光聚合物调制器设计中的直流漂移问题 .
The electric field distribution and DC drift have an important influence on the device stability and polarization efficiency of multi-layer electro-optic polymer modulator.In this paper, an equivalent circuit model is established by the theory of electromagnetic field, and the analysis results show that the steady- The field distribution depends on the electrical characteristics of the material; the relaxation time constant τ (τ = ε / σ2, where σ is the electrical conductivity and ε is the dielectric constant) of the material is the key to eliminate the DC field relaxation to a great extent. When the voltage is applied, the field distribution of the waveguide layer changes from the initial state to the steady state index, which is determined by the relaxation time difference between the waveguide layer and the cladding layer. When the two are different from each other, the relaxation disappears, but in the actual process Difficult to do this, therefore, this paper through analysis, simulation, proposed a simple “self-inhibition” mechanism, can well improve the design of multilayer electro-optic polymer modulator DC drift problem.