基于光学偏置的聚合物电光调制器研究

摘要

分析了两种使Mach-Zehnder调制器实现光学偏置的方法,即路径非对称和折射率非对称的波导设计.采用有限差分束传播法(FD-BPM)对两种基于光学偏置的Mach-Zehnder型电光调制器进行了模拟仿真研究,仿真结果显示两种光学偏置方法均实现了在转换函数的线性区域建立工作点的目标,并且分别得到了26 dB和23 dB的消光比输出.%The path asymmetrical and refractive index asymmetrical design for optical waveguide methods have been introduced which can make the Mach-Zehnder modulator to achieve optical bias. The simulation studies of the two kinds of optical bias methods are based on finite difference-beam propagation method ( FD-BPM ). The results show that both the two methods can make the Mach-Zehnder modulators to be biased at half-power point in the most linear region. The initial phase difference of the two arms can reach around π/2,and the extinction ratios are 26 dB and 23 dB respectively.