设计了一种高线性度、无偏置聚合物Y型耦合器电光调制器,它由Y型分束器、Y型合束器、两节推挽极化电光耦合波导构成的电光区和一个微带行波电极构成,给出了器件结构并对其参数做了优化。通过对施加的电学调制信号做傅里叶变换并结合器件的传递函数,给出了一种新型数值方法来建模和表征器件的静态和动态特性,推导并得到了器件的状态函数、静态响应、调制响应、三阶内调响应等表达式。计算和分析结果显示,器件的半波电压为2.69V;3dB调制带宽约为143GHz;当调制系数为1%~10%时,基频信号对器件所产生三阶内调噪声的抑制比为60dB~90dB。所给出的理论和相关公式也可用于具有Y型耦合器结构的类似电光器件(如电光开关)的设计、建模和分析。 A high linearity, unbiased polymer Y-type coupler electro-optic modulator is designed. It consists of a Y-type beam splitter, a Y-type beam combiner, two electro-optical regions formed by push- Microstrip traveling wave electrode structure, given the structure of the device and its parameters have been optimized. A novel numerical method is proposed to model and characterize the static and dynamic characteristics of the device by Fourier transform of the applied electrical modulation signal and the transfer function of the device. The state function of the device, the static response , Modulation response, third-order adjustment should be such expressions. The results of calculation and analysis show that the half-wave voltage of the device is 2.69V and the bandwidth of 3dB is about 143GHz. When the modulation factor is 1% ~ 10%, the fundamental frequency rejection ratio of the third-order intermodulation noise of the device is 60dB ~ 90dB. The theory and related formulas given can also be used in the design, modeling and analysis of similar electro-optical devices (such as electro-optic switches) with Y-coupler structures.